(Chapter 1)tbox

BASIC & Ladder for

A

User’s Guide Version 1.7

Version: 1.7 BASIC & Ladder 2

Disclaimer Every effort has been made to ensure the accuracy of the information in this guide. However, Techno Trade S.A. assumes no responsibility for the accuracy of the information. Product information is subject to change without notice. TWinSoft and A are registered trademark of Techno Trade s.a. Windows '95, '98, NT, 2000, XP are trademark of Microsoft Corp. Internet Explorer is a trademark of Microsoft Corp. Copyright © 2004-2006 by Techno Trade SA Edition: November 30, 2006


TABLE OF CONTENTS

1. PROGRAMS - BASIC ........................................................................................... 9

1.1.1. Task sequence of the process .................................................................................9 1.2. GENERAL ........................................................................................................ 10

1.2.1. Case ................................................................................................................... 10 1.2.2. Variable not declared ........................................................................................... 10 1.2.3. Statements and 'Line Feed'................................................................................... 10 1.2.4. Colors ................................................................................................................. 10 1.2.5. Access from the process to the variable................................................................. 10 1.2.6. Cycle time ........................................................................................................... 11 1.2.7. Distinction between Local – Global – System variables ........................................... 11 1.2.8. Break Line ........................................................................................................... 11 1.2.9. Precautions / Miscellaneous .................................................................................. 12

1.3. COMMENT....................................................................................................... 13 1.4. CONSTANT ...................................................................................................... 13 1.5. ASSIGNMENT ................................................................................................... 14 1.6. DIM STATEMENT............................................................................................... 15 1.7. COMPARISON ................................................................................................... 16 1.8. IF ...THEN ... ELSE … ELSEIF STATEMENT ............................................................... 17 1.9. ARITHMETIC OPERATORS ..................................................................................... 19 + (Addition)............................................................................................................. 19 - (Subtraction)....................................................................................................... 19 * (Multiplication)................................................................................................. 20 / (Division)........................................................................................................... 20 Modulo Operator ........................................................................................................ 21

1.10. LOGICAL OPERATORS .................................................................................... 22 Introduction...................................................................................................................22 AND .............................................................................................................................. 22 OR ................................................................................................................................ 23 XOR .............................................................................................................................. 23 NOT .............................................................................................................................. 24

1.11. FOR...NEXT ...STEP STATEMENT ..................................................................... 25 1.12. WHILE...WEND........................................................................................... 27 1.13. MATHEMATICAL FUNCTIONS............................................................................ 28

Trigonometric ................................................................................................................ 28 Logarithmic....................................................................................................................29 Exponential....................................................................................................................29 Power............................................................................................................................ 30 Square root ................................................................................................................... 30


1.14. FUNCTIONS (VARIOUS).................................................................................. 31 INC................................................................................................................................33 DEC...............................................................................................................................33 ABS ...............................................................................................................................33 LOBYTE .........................................................................................................................34 HIBYTE..........................................................................................................................34 LOWORD .......................................................................................................................34 HIWORD........................................................................................................................35 SWAPBYTES...................................................................................................................35 SHL ...............................................................................................................................35 SHR...............................................................................................................................36 Bit .................................................................................................................................36 SetBit ............................................................................................................................36 PackBits .........................................................................................................................37 SplitBits .........................................................................................................................38 Split32 ...........................................................................................................................39 Pack32...........................................................................................................................39 TriggerPos .....................................................................................................................40 TriggerNeg.....................................................................................................................40 PutChrono......................................................................................................................41 Truncate ........................................................................................................................41 Odd ...............................................................................................................................41 BCD...............................................................................................................................42 Sampling tables..............................................................................................................42 Type Casting ..................................................................................................................43

1.15. TIMERS / COUNTERS .................................................................................... 44 1.16. INDIRECT ADDRESSING.................................................................................. 44

Reading functions...........................................................................................................44 Writing functions ............................................................................................................44 Initialization of a Pointer .................................................................................................44

1.17. GOTO ..................................................................................................... 45 1.18. KEYWORDS ................................................................................................ 46 1.19. POU........................................................................................................ 47 1.20. POU – PROGRAM........................................................................................ 48

1.20.1. The Program 'Main'...........................................................................................48 1.20.2. Creating a Program...........................................................................................49 1.20.3. Calling a Program .............................................................................................49

1.21. POU – FUNCTION ....................................................................................... 50 1.22. POU – FUNCTION BLOCK .............................................................................. 53


2. PROGRAMS - LADDER ......................................................................................57

2.1.1. Task sequence of the process ............................................................................... 57 2.2. LADDER – PRINCIPLE ......................................................................................... 58

2.2.1. Inputs ................................................................................................................. 58 2.2.2. Outputs............................................................................................................... 58 2.2.3. Cycle time ........................................................................................................... 59

2.3. LADDER - MODES.............................................................................................. 59 2.3.1. Display mode....................................................................................................... 59 2.3.2. Edit mode............................................................................................................ 60

2.4. LADDER - TOOLBAR ........................................................................................... 61 2.4.1. Display mode....................................................................................................... 61 2.4.2. Edit mode............................................................................................................ 62

2.5. VARIABLES ...................................................................................................... 63 2.5.1. Local Tags ........................................................................................................... 63 2.5.2. Global Tags ......................................................................................................... 63 2.5.3. The colors of the Tags.......................................................................................... 63

2.6. CREATE LADDER DIAGRAM................................................................................... 64 2.6.1. Inserting items .................................................................................................... 65 2.6.2. The colors of the Tags.......................................................................................... 65 2.6.3. The Keys ............................................................................................................. 65

2.7. STEP BY STEP CREATING OF LADDER ....................................................................... 66 2.8. DRAWING LINES IN LADDER …. ............................................................................. 70 2.9. FUNCTIONS ..................................................................................................... 71

2.9.1. Analog Comparison Functions ............................................................................... 72 2.9.2. Special Functions ................................................................................................. 72 2.9.3. Timer & Counter Functions .................................................................................. 73 2.9.4. Math. Assignments functions ................................................................................ 73 2.9.5. Math. Arithmetic functions.................................................................................... 74 2.9.6. Math. Bitwise functions ........................................................................................ 74 2.9.7. Math. Shift functions ............................................................................................ 75

2.10. MATHEMATICAL BLOCK.................................................................................. 76 2.10.1. Introduction..................................................................................................... 76 2.10.2. Assignments .................................................................................................... 78 2.10.3. Arithmetic operations ....................................................................................... 78 2.10.4. Comparisons .................................................................................................... 79 2.10.5. Bit manipulations.............................................................................................. 79 2.10.6. Boolean operations........................................................................................... 80 2.10.7. Conversion + Indirect addressing ...................................................................... 81 2.10.8. Miscellaneous................................................................................................... 82

2.11. POU (PROGRAM ORGANIZATION UNITS)............................................................ 83 2.12. POU – PROGRAM........................................................................................ 84

2.12.1. The Program 'Main' .......................................................................................... 84 2.12.2. Creating a POU Program................................................................................... 84


2.12.3. Calling a POU Program in another Program ........................................................85 2.13. POU – FUNCTION ....................................................................................... 86

2.13.1. Creating a POU Function ...................................................................................86 2.13.2. Example of a Function ......................................................................................88 2.13.3. Calling a POU Function in a POU Program ..........................................................89

2.14. POU - FUNCTION BLOCK ............................................................................... 90 2.14.1. Creating a POU Function Block ..........................................................................90 2.14.2. Example of a Function Block..............................................................................92 2.14.3. Calling a POU Function Block in a POU Program .................................................93 2.14.4. Debugging of a Function block ..........................................................................94

3. TIMERS.............................................................................................................95

3.1. PRESENTATION................................................................................................. 95 3.2. INTRODUCTION ................................................................................................ 96 3.3. CREATING A TIMER............................................................................................ 96 3.4. THE VARIABLES OF A TIMER ................................................................................. 97 3.5. USING TIMERS IN LADDER ................................................................................... 98

3.5.1. The instance name...............................................................................................98 3.5.2. The Preset ...........................................................................................................99

3.6. USING TIMERS IN BASIC.................................................................................. 100 3.6.1. Reminder...........................................................................................................100 3.6.2. Syntax ...............................................................................................................100 3.6.3. Reset Timer Function..........................................................................................101 3.6.4. Examples...........................................................................................................101

3.7. USING TIMERS IN POU’S .................................................................................. 101 3.8. TIMER – SINGLE SHOT ..................................................................................... 102 3.9. TIMER – MONOSTABLE ..................................................................................... 103 3.10. TIMER – INTEGRAL .................................................................................... 104 3.11. TIMER – ON DELAY ................................................................................... 106

4. COUNTERS......................................................................................................107

4.1. PRESENTATION............................................................................................... 107 4.2. INTRODUCTION .............................................................................................. 108 4.3. CREATING A COUNTER...................................................................................... 108 4.4. THE VARIABLES OF A COUNTER ........................................................................... 109 4.5. USING COUNTERS IN LADDER ............................................................................. 110

4.5.1. The contact used with the pulse input .................................................................110 4.5.2. The instance name.............................................................................................110 4.5.3. The Preset .........................................................................................................111

4.6. USING COUNTERS IN BASIC.............................................................................. 112 4.6.1. Reminder...........................................................................................................112 4.6.2. Syntax ...............................................................................................................112 4.6.3. Reset Counter Function ......................................................................................112


4.7. USING COUNTERS IN POU’S............................................................................... 112 4.8. COUNTER - UP............................................................................................... 113 4.9. COUNTER - DOWN......................................................................................... 114 4.10. COUNTER - RING...................................................................................... 116

5. LIBRARY MANAGER .......................................................................................119

5.1. IMPORT OF POUS (SAVING POUS IN A LIBRARY) ..................................................... 119 5.2. EXPORT OF POUS (RETRIEVAL OF POUS FROM A LIBRARY) ......................................... 120 5.3. USE OF A LIBRARY IN A TWINSOFT DOCUMENT........................................................ 120



1. Programs - BASIC TBOX MS and TBOX LITE support 2 languages: BASIC and Ladder. Both languages are used to execute process automation

BASIC is a text language, very easy to use for making calculation. It supports all advanced mathematical functions.

LADDER is a graphical language, which should be preferred when Boolean

operations are required. LADDDER is much more efficient than BASIC for handling ‘digital’ Tags.

BASIC and LADDER can be used together We suggest that you divide your process into several programs (≅ sub-programs) depending on the process concerned. According to the kind of process, you create programs in BASIC and programs in LADDER. Then you combine programs as you want: BASIC calling LADDER and reciprocal.

This chapter explains the syntax of BASIC.

To see an example, load the TWinSoft document 'MSBASIC.tws' that you find in the 'Samples' directory of TWinSoft.

Example: ' This is my first program If (Temperature > 70) or (Emergency=1) then Pump=1 Alarm=1 endif

1.1.1. Task sequence of the process Inputs are handled before starting the cycle Outputs are written at the end of the cycle Variables are handled immediately in the cycle

Sequence:

Reading DI

If new second: Reading AI

1 CYCLE of Ladder/BASIC

Writing DO

If new second: writing AO Reading DI

If new second: Reading AI

1 CYCLE of Ladder/BASIC ….


1.2. General

1.2.1. Case BASIC is not case sensitive.

1.2.2. Variable not declared

A variable used within the program and which has not been declared in the list of Tags of the TWinSoft document is refused at the compilation. A variable must be declared either in the list of Tags (=global Tag), in list of POU Tags or with a Dim statement (=local Tag)

1.2.3. Statements and 'Line Feed' The statements can be separated by a 'Line Feed' or by a colon ‘:’

Example with several assignments: a=50 b=c

Or a=50 : b=c

The statements must be on the same line.

Example with if .. then: if a=50 then b=c endif

1.2.4. Colors Comment : the comments appear in green color

Constant : a constant appears in red color

Keyword : a keyword appears in blue color (see the list at chapter 1.18)

Variable : a variable appear in black color

1.2.5. Access from the process to the variable Inputs: the physical inputs are read once at the beginning of the cycle. It means that an

input used at several places in the program, will always be at the same value. Outputs: the physical outputs are executed at the end of the cycle, according to their last

status. Internal variables: the internal variables (DIV and AIV) are read/executed at the moment

they are treated within the program. It means the changing on a variable is updated everywhere it is used.


1.2.6. Cycle time One cycle corresponds to a complete process (BASIC and LADDER), from the first until the last line. The cycle time is the time needed to execute on cycle. The cycles are executed permanently, one after each other. For question of security, one cycle can never be greater than 1 second. If this occurs, an internal watchdog timer resets the TBOX automatically (the watch dog is of approximately 1.6 second) The cycle time is available from the ‘RTU Identification’, available from the main menu 'Communication'.

1.2.7. Distinction between Local – Global – System variables

A suffix can be used to make the distinction between the different types of variable. @ : it is a Global Tag (example: input0@) # : it is a Local Tag (example: second#) ! : it is a System variable (example: second!)

Examples: dim Temperature as integer if Temperature@ > 20 then if triggerpos(prgrun!) then ......

Temperature@ is the global Tag, if it exists, otherwise the compiler returns an error. It will not use the local Tag.

1.2.8. Break Line When a line is very long, it can be cut using the character ‘_’ (underscore). Examples: If A=0 Or B=0 Or C=0 Or D=0 Or E=0 Or F=0 Or G=0 Or H=0 Or_ I=0 Or J=0 Or K=0 Or L=0 Or M=0 Or N=0 Or O=0 Or_ P=0 Or Q=0 Or R=0 Or S=0 Or T=0 then output=0 endif

1. To use System variables without declaring them as Tag, the suffix is mandatory.

2. If there is no suffix, the order of resolution is local Tag if it exists, then global Tag if it exists. Otherwise the compiler returns an error.

3. The suffix cannot be declared within a DIM statement (it is clear that the variable will be local).


1.2.9. Precautions / Miscellaneous When declaring local Tags or arguments to Function or Function block, do not use

the same name as global Tags.

When a Tag is dimensioned within the programming (example: dim Tag as Bool), it is automatically considered as a local Tag.

When several operators are used following each other, one needs to separate them with brackets. Example: if ((a=10) or (a=20)) and (b=0) then

With Timer/Counter functions, if you wish to associate a Tag to ‘Value’ and/or ‘Preset, they must be of type DWORD (32 bits).


1.3. Comment

• Rules A comment can start with the keyword REM or with the single apostrophe ' REM : is considered as a statement. It can then only be used at the beginning of a

line. ' : is not a statement. It can then be placed anywhere in the line.

• Examples REM this is a comment ' this is a comment var1=var2 ' var2 is assigned to var1

1.4. Constant

• Rules Constant statement can be expressed in:

decimal hexadecimal (with prefix &H) floating point

• Limits

To be accepted, the constant must hold into a INT 32 bits or into a IEEE 32 bits Floating. The 'time span' is limited to 49 days.

• Examples

decimal: a=123456 hexadecimal: a=&H1E240 Floating point: a=123.456

In an arithmetic operation, a constant is always converted into the format of the Tag it is associated to.

Integer / 2.5 Constant will be converted to Integer, it means 2.


1.5. Assignment

• Syntax VarName=expr ' variable Table[x]=expr ' indexed variable, part of a table (array)

[x] is the index of the variable in the table. Only square brackets [ ] can be used.

• Indexing With a local variable 'simple', indexing is not allowed. With a local variable 'array', index must be specified with the Dim statement. With a global variable, indexing is allowed. The variable is then considered as the first of a virtual table composed of successive ModBus addresses. See For...next statement. with Global Tags.

• Examples Temperature=Setpoint Delay=5 LET StartPump[2]=1

The keyword LET can be used but is optional: LET a=b


1.6. Dim Statement

The Dim statement is used to create Local Tags inside a program. Local Tags can also be created from the list of 'POU Tags'.

• Syntax

Variable Dim MyVar Dim MyVar as <Type> ' See types below

Table (array) Dim Table[n] <as Type> ' Table is an array of n elements (1 to n)

' The types of the elements can also be declared

Each variable of the table can be represented with the name of the table and its index: Table[1] Table[2] ....

• Types available

Types description

BOOL 1 bit - Digital BYTE 8 bits - Unsigned INTEGER 16 bits - Signed WORD (*) 16 bits - Unsigned LONG 32 bits - Signed DWORD 32 bits - Unsigned SINGLE 32 bits - Float IEEE

(*) WORD is the default format when the type is not declared, or when a local Tag is used without Dim statement.

• Examples Dim Temperature as Single Dim input2 as Bool Dim table[4] as Word

The type is optional. If it is not declared, the default format isWORD


1.7. Comparison

The available comparison operators are:

= : equal than < : smaller than <= : smaller or equal than > : bigger than >= : bigger or equal than <> : different

The comparison returns a Boolean result. It can be used to compare 2 numbers and get the result in a Bool, or in a sequence as condition; for instance if ..then.

• Syntax if (expression1 operator expression2) then result=(expression1 operator expression2)

• Arguments result :Bool expression :any expression composed of Bool, Byte, Word, Long, Float

You can mix several types of variables in the 'expressions'.

• Examples Status=Value<>0 if (level<=125) then Pump=1 endif


1.8. If ...Then ... Else … Elseif statement

Executes a group of statements according to a condition.

• Syntax Classical syntax: with Statements on different lines:

If Condition1 then Statement1 Statement2 elseif Condition2 then Statement3 else Statement4 endif

The same instructions can be written like following: If Condition1 then Statement1 Statement2 else if Condition2 then Statement3 else Statement4 endif endif

Several Statements on the same line: the Statements must be separated by colons:

If Condition then Statement1 : Statement2 endif

Condition and Statement in 1 line: Then endif cannot be indicated.

If Condition then Statement1

Several If ... then statements chained It is possible to chain several If ... then statements. In such case, each of them must end with endif keyword.

If Condition1 then Statement1 If Condition2 then Statement2 endif endif

• Arguments Condition

The condition is Boolean. It can be any expression resulting in TRUE or FALSE status. Examples: If Button then ‘(is equivalent to: if Button=1 then) If not Button then ‘(is equivalent to: if Button=0 then) If ((Var1>=15) AND (Var1<=25)) then

In this example: If Condition1 is TRUE, Statement 1 and 2 are

executed. If Condition1 is FALSE, Condition2 is tested.

If Condition2 is TRUE, Statement3 is executed otherwise Statement4 is executed


• Examples Call of a POU If (level>100) then Call StopPump 'StopPump is a POU Program endif

Start of a Loop on condition If (Level<15) then for i=1 to 4 If Pump[i]=0 then Pump[i]=1 endif

next endif

Test a value at '0' If Level then 'The condition is TRUE as long as Level<>0 pump=1 endif


1.9. Arithmetic operators + (Addition)

Sums several numbers

• Syntax result=expression1+expression2+ expression3 ...

• Arguments result :Byte, Word, Long, Float expression :any expression composed of Bool, Byte, Word, Long, Float

You can mix several types of variables in the 'expressions': it is automatically converted to the type of the variable 'result'

• Examples Word1=Word2+Float2+Float3 'Result in 'Word' format with Float rounded Float1=Word2+(Float2*2) 'Result in Float

- (Subtraction) Gives the difference between numbers or used to change a number to negative.

• Syntax result=expression1-expression2-expression3 ... result=-number

• Arguments result :Byte, Word, Long, Float expression :any expression composed of Bool, Byte, Word, Long, Float


• Examples Word1=Word2-Float2-Float3 'Result in 'Word' format with Float rounded Float1=Word2-(Float2*2) 'Result in Float

With Addition and Subtraction, according to the types used, (Byte, Word or Int) be attentive to roll over


* (Multiplication) Multiplies numbers.

• Syntax result=expression1*expression2*expression3 ...

• Arguments result :Byte, Word, Long, Float expression :any expression composed of Bool, Byte, Word, Long, Float. You can mix several types of variables in the 'expressions': it is automatically converted to the type of the variable 'result'

• Examples Word1=Word2*Float2*Float3 'Result in 'Word' format with Float rounded Float1=Word2*Float2*2 'Result in Float

/ (Division) Divides numbers.

• Syntax result=expression1/expression2/expression3 ...

• Arguments result :Byte, Word, Long, Float expression :any expression composed of Bool, Byte, Word, Long, Float You can mix several types of variables in the 'expressions': it is automatically converted to the type of the variable 'result'

• Examples if (Float2>0) and (Float3>0) then Word1=Word2/Float2/Float3 'Result in Word with Float rounded endif if (Float2>0) then Float1=Word2/Float2/2 'Result in Float endif

if expression1 and expression2 are WORD, the result is automatically changed to DWORD. This avoids over range problems. The rules are:

BYTE * BYTE = WORD (16 bits) WORD * WORD = DWORD (32 bits - unsigned) INT * INT = LONG (32 bits - Signed)

When a divisor=0 (zero) the result is unpredictable and depends on the type of 'result' variable. To avoid any problem, you have to check the divisor(s) before executing the division(s)


Modulo Operator Divides 2 numbers and returns the remainder

• Syntax result=number1 % number2

• Arguments

result :Word, Long, Float numbers :Word, Long You can mix numbers of 'Word' and 'Long' types together: the type of the numbers are automatically converted to the type of the 'result'

• Examples Remainder=47 % 15 'Remainder=2

Both numbers must be positive. If one number = 0 then result = 0


1.10. Logical operators

Introduction There are 2 ways to interpret those operators: - as Boolean operators - as Bitwise operators

Boolean operators This is probably the more usual way to use the logical operators: in an expression you execute Boolean operations between several Tags.

Example: if ((Var1>=150) And (Var2<=200)) Or ((Emergency=1) And (not Button))

Bitwise operators Those operators are used between 2 Tags and execute Bitwise operations on each bit of the Tags:

AND Operator OR Operator XOR Operator NOT Operator

AND

Performs a Bitwise AND operation on 2 expressions. 00110101 11010110 00010100

• Syntax

result=expression1 And expression2

• Arguments result :Word or Long expression :any expression composed of Bool, Byte, Word, Long


• Examples MyVal=Word1 And 255 'Mask to erase the MSB MyVal=(Word1*2) And Word2

When using several operators, be careful to the priority of the operations. We advise to use brackets to separate clearly the operations. Example: A=2 And B <>3 Without brackets, will be calculated like following:

(A=((2 And B)<>3)) With brackets, like it is probably required: (A=2) And (B<>3)


OR Performs a Bitwise OR operation on 2 expressions. 00110101 11010110 11110111

• Syntax result=expression1 Or expression2

• Arguments result :Word or Long expression :any expression composed of Bool, Byte, Word, Long You can mix several types of variables in the 'expressions': it is automatically converted to the type of the variable 'result'

• Examples MyVal=Word1 Or Word2 MyVal=(Word1*2) Or Word2

XOR Performs a Bitwise XOR operation on 2 expressions. 00110101 11010110 11000011

• Syntax result=expression1 XOR expression2


• Examples MyVal=Word1 XOR Word2 MyVal=(Word1 XOR Word2) And Word2


NOT Performs a Bitwise NOT operation on 2 expressions. It inverts the bits. 11010110 00101001

• Syntax result=expression1 Not expression2


• Examples MyVal=Word1 Not Word2

Notes: 1. The NOT function is a complement to 1 2. An inversion (a=-b) is a (complement to 1) + 1

Examples:

Value NOT Inversion -2 1 2 -1 0 1 0 -1 0 1 -2 -1 2 -3 -2


1.11. For...Next ...Step statement For...Next is used to repeat several statements, a specified number of times using loops and indexing of table (array). We speak also of 'index addressing', as we access variable using an index. It is the ideal tool to execute repetitive procedure.

• Syntax For ... next i

Statements are executed n times: Dim i as Word For i=x to n step y Statement Statement next i x : start index. Any number ( >= 1) n : last index. Any number > x step y : optional. Increment in the index at each next operation.

If not declared, step = 1. Must be different than 0

For ... nextcycle

The Statement is executed once at each cycle of the program: This can be useful to balance the resources of a program, and mandatory when there are a lot of steps.

Dim i as Word For i=1 to n Statement nextcycle i

• With local Tags

To use index addressing with local Tags, you must declare a table (array) with its dimension and type. It cannot be declared from the list of POU Tags, but using code in the program. Example: Dim InitValue[3] as Word Dim i as Word For i=1 to 3 InitValue[i]=0 next i

Index can be an expression. Example: (i*2)+3

In this example, [3] is the size of the array. Only square brackets [ ] can be used

Be careful using big value for i. With function For…Next, the program jumps out of the routine when all steps have been executed. If there are too many, the program might generate a watchdog. You should then use For … nextcycle


• With global Tags As global Tags have been created, they already have a type. The table is composed of the Tag selected and those following by in order of ModBus addresses in the list of Tags.

Example: you have 'start' variables you want to activate at the same time. You create the 4 Tags, with successive ModBus addresses.

Signal Tag ModBus

address IN 0 Start1 256 IN 1 Start2 257 IN 2 Start3 258 IN 3 Start4 259

Dim i as Word For i=1 to 4 Start1[i]=1 next i

Start1[2] is then similar to Start2 etc...

• Example For...Next statements nested

REM start of Pumps and associated lamp. Dim i as Word Dim j as Word If start=1 then For i=1 to 5 Pump1[i]=1 next i For j=i+5 to 15 'at this step, i=5 => j=10 Lamp1[i]=1 next j endif


1.12. While...Wend While...Wend statement executes a loop as long as the condition is TRUE. Therefore, the rest of the program is not executed as long as the condition is TRUE.

• Syntax Classical syntax While condition statement1 statement2 Wend

Several While...Wend can be chained While condition1 statement1 While condition2 statement2 Wend Wend

• Argument condition : Bool Tag or expression

• Example While level>150 call Alarms Wend

Be careful the loop does not exceed 1 second. A watchdog is generated after about 1.6 second. When it is possible, we advise to use the For…Next or For…Nextcycle statements


1.13. Mathematical Functions

Trigonometric The trigonometric functions supported are: Sine, Arcsine, Cosine, Arccosine, Tangent, Arctangent. • Syntax Result=Sin(x) Result=Cos(x) Result=Tan(x) Result=ArcSin(x) Result=ArcCos(x) Result=ArcTan(x)

• Argument x : Single or constant result : Single

• Examples ‘Calculation of pi Dim a as Single Dim Pi as Single a=arcsin(1) Pi=a*2 ‘Implementation of a sinusoid if triggerpos (PrgRun) then Radian=0 if Radian < (Pi*2) then 'Pi*2 = 360 degrees Radian=Radian + (Pi/180) 'Pi/180 = 1 degree else Radian=0 endif Sine=sin(Radian) Sinusoid=(sine*90) + 200 Degree=(Radian*180)/pi

All trigonometric functions work with angles expressed in radian. A circle of 360 degree corresponds to 2 π radian


Logarithmic The logarithmic functions supported are Logarithm and Natural logarithm

The logarithm is the logarithm having base 10 Log (10) = 1 Log (100) = 2 Log (1000) = 3

The natural logarithm is the logarithm having base e.

The constant e is approximately 2.718282. • Syntax Result=Log(x) Result=Ln(x)


Exponential Exponential function returns e (the base of natural logarithm) raised to a power The constant e is approximately 2.718282 The Exp function is the complement to natural logarithm function (see above)

• Syntax Result=Exp(x)



Power The Power function returns the value of a base expression taken to a specified power.

• Syntax Result=Pow(base, exponent)

• Argument base : Single or constant exponent : Single or constant result : Single

• Example Power=Pow(10, 3) ‘returns 1000 (10^3) Power=Pow(0, 0) ‘returns 1 Power=Pow(1, 0) ‘returns 1

Square root Returns the square root of a number.

• Syntax Result=Sqrt(x)


• Example MySquar=Sqrt(4) ‘returns 2 MySquar=Sqrt(9) ‘returns 3 MySquar=Sqrt(23) ‘returns 4.796 MySquar=Sqrt(0) ‘returns 0


1.14. Functions (various) The following Functions are supported. See details in the following pages. Operators

INC Increment DEC Decrement

Absolute value

ABS Byte manipulation

LOBYTE returns LSB of a WORD HIBYTE returns MSB of a WORD LOWORD returns Word 'Low' of a DWORD HIWORD returns Word 'High' of a DWORD SWAPBYTE switches bytes of a WORD

Shift

SHL Shift left SHR Shift right

Bit manipulation

Bit to read a bit a Analog SetBit to write the bit of an Analog PackBits to putting bits in an Analog register SplitBits to extracting bits from an Analog register

Trigger

TriggerPos to work on the positive edge of a digital Tag TriggerNeg to work on the negative edge of a digital Tag

Chrono

PutChrono to force the writing of a value into chrono Various

Truncate to extract an Integer from a Float Odd to indicate whether a Tag in Even or Odd BCD to transform a decimal number to BCD format

Sampling Table

Tablesize to check the size of a table samplebyte to access data of a Tag in ‘Byte’ format Sampleword to access data of a Tag in ‘Word’ format sampledword to access data of a Tag in ’32 bits-Long’ format samplesingle to access data of a Tag in ’32 bits-Float’ format


Type Casting CBool Type casting to Boolean format CByte Type casting to Byte format CDWord Type casting to 32 bits-Long format (Unsigned) CInt Type casting to Integer format (Signed) CLng Type casting to 32 bits-Long format (Signed) CSng Type casting to 32 bits-Float format CWord Type casting to Word format (Unsigned)


INC The INC function increments a variable (+1).

• Syntax inc(Var)

• Argument Var :must be any Integer variable: Byte, Word, Long

• Example If TriggerPos(Pump_0) then inc(Counter_0) endif

DEC The DEC function decrements a variable (-1)

• Syntax dec(Var)

• Argument Var :must be any Integer variable: Byte, Word, Long

• Example If TriggerPos(Pump) then

dec(PumpActive) endif

ABS The ABS function returns the absolute value of any variable.

• Syntax Result=abs(Var)

• Argument Var :any format: Byte, Word, Long, Float


LOBYTE Mask on the lowest Byte of a Word variable. Example:

Variable: 0010010101101011 Mask: 0000000011111111 Result: 0000000001101011

• Syntax Result=LoByte(Var)

• Argument Var :Word (16 bits) Result :Byte or Word

HIBYTE Mask on the highest Byte of a Word variable. Example:


• Syntax Result=HiByte(Var)

• Argument Var :Word (16 bits) Result :Byte or Word

LOWORD Mask on the lowest Word of a DWord variable. Example:


• Syntax Result=LoWord(Var)

• Argument Var :DWord (32 bits) Result :Word


HIWORD Mask on the highest Word of a DWord variable. Example:


• Syntax Result=HiWord(Var)

• Argument Var :DWord (32 bits) Result :Word

• Example HighestWord=HiWord(Long)

SWAPBYTES Invert the bytes of a Word variable. Example: inversion

Variable: 01111100 11000011 Result: 11000011 01111100

• Syntax Result=SwapBytes(Var)

• Argument Var :Word Result :Word

SHL Shift to the left of x bits (without roll over). Example: Shift left of 4

Variable: 00001111 00011000 Result: 11110001 10000000

• Syntax Result=SHL(Var,shift)

• Argument Var :Word or DWord Shift :Word or Constant Result :Word or Dword

use the same format for Var and Result


SHR Shift to the right of x bits (without roll over). Example: Shift right of 4

Variable: 00001111 00011000 Result: 00000000 11110001

• Syntax Result=SHR(Var,shift)

• Argument Var :Word or DWord Shift :Word or Constant Result :Word or Dword

Bit This function allows reading a bit in a analog register. The bit number starts at ‘bit0’ (lsb). Example:

… 0 1 1 0 1 0 1 1 bit # ..

. 7 6 5 4 3 2 1 0

• Syntax Result=Bit(Register, BitNumber)

• Argument Result :Bool Register :Word, DWord BitNumber :Constant, Byte, Word, DWord

• Example If bit(PumpList,4) then Lamp4=1 endif

SetBit This function allows forcing a bit in an analog register. The bit number starts at ‘0’ (lsb)

• Syntax SetBit(Register, BitNumber, Value)

• Argument Register :Word, DWord BitNumber :Constant, Byte, Word, DWord Value :Bool

• Example 'Inversion of bit 8. Setbit(Register,8,not bit(Register,8))

use the same format for Var and Result


PackBits Those functions allow putting a series of addresses of digital Tags into an analog register. There are 3 PackBits functions: PackBits8: to put 8 Tags of successive addresses to a Byte register. PackBits16: to put 16 Tags of successive addresses to a Word register. PackBits32: to put 32 Tags of successive addresses to a DWord register.

• Syntax Byte_register = PackBits8(Value) Word_register = PackBits16(Value) DWord_register = PackBits32(Value)

• Argument Register : depending of the function it is a Byte, Word, or DWord Value : it is the ModBus address of the first bit. The value at this address becomes the

lsb of the analog register

• Example 'Putting Digital DIR_0 to DIR_15 to register ANA_16 'ModBus address of DIR_0 = 20480 ANA_16 = PackBits16(20480)

DIR_0 0 1 1 1 DIR_1 0 1 0 1 DIR_2 0 1 0 1 DIR_3 0 1 0 1 DIR_4 0 1 0 1 DIR_5 0 1 0 1 DIR_6 0 1 0 1 DIR_7 0 1 0 1 DIR_8 1 0 0 1 DIR_9 0 0 0 1 DIR_10 0 0 0 1 DIR_11 0 0 0 1 DIR_12 0 0 0 1 DIR_13 0 0 0 1 DIR_14 0 0 0 1 DIR_15 0 0 1 1 ANA_16

256

255

32769

65535

1. When creating the digital Tags, be sure you reserve enough addresses after the one declared in the function

2. Tags for all addresses do not need to be created, but it is

advised to do it to avoid confusion when creating Tags afterwards


SplitBits Those functions allow extracting bits from an analog register to a series of ModBus addresses of digital Tags. There are 3 SplitBits functions:

SplitBits8: extract the 8 bits of a Byte to 8 successive ModBus addresses of digital Tags. SplitBits16: extract the 16 bits of a Word to 16 successive ModBus addresses of digital

Tags. SplitBits32: extract the 32 bits of a DWord to 32 successive ModBus addresses of digital

Tags.

• Syntax SplitBits8(Byte_register, Value) SplitBits16(Word_Register, Value) SplitBits32(DWord_Register, Value)

• Argument Register : depending of the function it is a Byte, Word, or DWord Value : it is the ModBus address of the first bit. The value at this address

corresponds to the lsb of the analog register

• Example 'Extracting bits of ANA_16 to DIR_0 ... DIR_15 'ModBus address of DIR_0 = 20480 SplitBits16(ANA_16,20480)

ANA_16

256 255 32769 65535

DIR_0 0 1 1 1 DIR_1 0 1 0 1 DIR_2 0 1 0 1 DIR_3 0 1 0 1 DIR_4 0 1 0 1 DIR_5 0 1 0 1 DIR_6 0 1 0 1 DIR_7 0 1 0 1 DIR_8 1 0 0 1 DIR_9 0 0 0 1 DIR_10 0 0 0 1 DIR_11 0 0 0 1 DIR_12 0 0 0 1 DIR_13 0 0 0 1 DIR_14 0 0 0 1 DIR_15 0 0 1 1

1. When creating the digital Tags, be sure you reserve enough addresses after the one declared in the function

2. Tags for all addresses do not need to be created, but it is

advised to do it to avoid confusion when creating Tags afterwards


Split32 This function converts one 32 bits register to two 16 bits registers.

This can be useful if you have to transfer 32 bits register, using a unique transaction including 16 bits and 32 bits registers. The 32 bits registers will be seen as 2 x 16 bits registers.

• Syntax Split32(32bitsReg, Hword, Lword)

• Arguments 32bitsReg : Register to split into 2 Words (DWord or Float) Hword : High 16 bits of the 32 bits register (Word) Lword : Low 16 bits of the 32 bits register (Word)

• Example 'Converting the Floating register Temperature to TempHigh and TempLow Split32(Temperature, TempHigh, TempLow)

Pack32 This function converts two 16 bits registers into one 32 bits register.

• Syntax Pack32(32bitsReg, Hword, Lword)

• Arguments 32bitsReg : Register receiving the 2 Words following (DWord or Float) Hword : High 16 bits of the 32 bits register (Word) Lword : Low 16 bits of the 32 bits register (Word)

• Example 'Converting the Temperature splitted into 2 Words Pack32(Temperature, TempHigh, TempLow)


Trigger The Trigger function allows checking a transition in an expression.

TriggerPos It informs on the transition '0' to '1' of a digital Tag.

• Syntax X = TriggerPos(expression)

X = 1 at changing of the expression (FALSE to TRUE) during one cycle of the program.

• Argument X :Bool Expression :any expression composed of Bool, Byte, Word, Long

• Examples 'To Set an Output when pressing a start button if TriggerPos(Start) then Output=1 endif 'To initialize a variable at start up of TBox MS Dim Setpoint as Word if TriggerPos(PrgRun!) then Setpoint=123 endif

TriggerNeg It informs on the transition '1' to '0' of a digital Tag.

• Syntax X = TriggerNeg(expression)

X = 1 at changing of the expression (TRUE to FALSE) during one cycle of the program.

• Argument X : Bool Expression : any expression composed of Bool, Byte, Word, Long

• Example 'To Reset an Output when pressing a Stop button if TriggerNeg(Stop) then Output=0 endif


PutChrono This function forces recording into the chronology. Depending on the type of the Tag selected, the value is written to the ‘Analog chronology’ or ‘Digital chronology’.

• Syntax PutChrono(variable)

• Argument variable : Tag to insert into the chronology digital Tag (Bool) writing to Digital chronology analog Tag (Byte, Word, Long, Single) writing to Analog chronology

• Examples if Button=1 then PutChrono (Button) PutChrono (Level) PutChrono (Temperature) Endif

Truncate This function extracts the whole number from a Tag in Single format.

• Syntax Long_register=Truncate(Single_register)

• Argument Long_register : Long Single_register : Single

• Examples Whole_value = Truncate(Floating_reg) If Floating_reg = 123.456 then Whole_value = 123

Odd This function indicates whether an analog Tag is ODD or EVEN.

• Syntax Bool_register=odd(analog_register)

• Argument Bool_register : Bool analog_register : Byte, Word, Long, Single

• Examples Ouput=odd(Analog) If Analog is ODD, Output=1; otherwise Output=0


BCD This function transforms a decimal number to BCD format. BCD format means that each 4 bits is considered as an entity corresponding to 1 number.

• Syntax Word_output=bcd(Word_input)

• Arguments Word_output : Word Word_input : Word

• Examples Ouput=bcd(Word) If Word=4660 then Output=1234

decimal: 4660 binary: 0001 0010 0011 0100 BCD 1234

Sampling tables Those functions allow accessing a specific value in sampling table. Those functions let you to take benefit of pre-computed values of sampling table, like illustrated in the example below: • Syntax tablesize(index) to check the size of a table

samplebyte(index,offset) to access data of a Tag in Byte format sampleword(index,offset) to access data of a Tag in Word format

sampledword(index,offset) to access data of a Tag in 32 bits format samplesingle(index,offset) to access data of a Tag in Float format • Arguments index: index of the sampling table (see list of sampling tables) offset: sample you want to access. Offset=0 means the last sample • Examples

Imagine you want to calculate the arithmetic average of a value based on a period of 15 minutes. You could do it using Ladder or BASIC. But you can make it much more easily using a sampling table and one of those functions. Sampling table configuration:

– Type= average – period= 15 minutes – Size= 1

You then use the function appropriate to the format of the Tag like following:

Average=sampleword(1,0)


Type Casting TWinSoft handles type casting automatically, but in some cases it can lead to misinterpretation To prevent it, we have implemented Type Casting functions that make you be sure of the type used in the Functions. • Syntax CBool(Var) Type casting to Boolean format CByte(Var) Type casting to Byte format

CDWord(Var) Type casting to DWord format CInt(Var) Type casting to Integer format

CLng(Var) Type casting to Long format CSng(Var) Type casting to Single (Float) format

CWord(Var) Type casting to Word format

• Examples Without Casting With Type Casting Function Imagine A as a BOOL and A=1: (A * 3600) is interpreted as (1 * 1 ) !! Type casting must be applied to the constant

(CInt(A) * 3600) (1 * 3600) A is used as an Integer and not a Boolean

Imagine A as a WORD and A=65535 Imagine B as a INTEGER B=Abs(A) the result will be –1 !! Abs(65535) 65535 65535 in INTEGER format becomes -1

B=Abs(CInt(A)) the result will be 1 Abs(-1) 1


1.15. Timers / Counters

See chapters 3 and 4

1.16. Indirect addressing

Indirect addressing allows accessing Variables from their addresses (and not from their Tag name) It can be in most of the case replaced by 'index addressing' and For...Next...Step statement which is typically used in BASIC programming.

Reading functions • Syntax Digital=PeekBool (Pointer) 'Reading address of a BOOL Analog16=PeekWord (Pointer) 'Reading address of a WORD Float=PeekFloat (Pointer) 'Reading address of a FLOAT Analog32=PeekLong (Pointer) 'Reading address of a LONG

• Arguments Pointer : Word register containing the ModBus address of the variables. Digital : Boolean variable to receive the status at the address of 'Pointer'. Analog16 : FLOAT : Analog32 :

Analog variable to receive the value at the address of 'Pointer'. We advise to use a type of variable equivalent to the one of the address read (Float when addressing a Float, Long when addressing a Long, ...).

Writing functions • Syntax PokeBOOL(Pointer, State) PokeWord(Pointer, Value) PokeFloat(Pointer, Value) PokeLong(Pointer, Value)

• Arguments Pointer :Word register or Expression containing the ModBus address of the variables. State :Value (0 or 1) to write in the address of 'Pointer' Value :Value or Expression to write in the address of 'Pointer'

Initialization of a Pointer This function allows you to get the address of a Tag. It can be useful to initialize a Pointer from the first Tag that has to be treated by the indirect addressing functions.

• Syntax Pointer=AdrOf(Tag)

1. For programmer used to A Ladder programming, those indirect functions are available, but replaced in BASIC by indexed addressing (array). Use of indirect addressing should be very limited.

2. According to the type of Function you use (Bool, Word, Float or Long), be careful to associate addresses of similar registers.


1.17. GOTO

• Label A label can be defined anywhere in a program like following:

Alarms: Pumps:

The semicolon " : " indicates it is a label. The name of a label must use the following rules:

characters accepted are letters, numbers and underscore. the name cannot start with a number. the maximum length is of 15 characters. BASIC is not case sensitive.

To avoid confusion, do not use keywords (see chapter 1.17) or Tag names.

• Syntax Goto Label


1.18. Keywords BASIC uses the following keywords. You should not use name similar to those keywords.

% _ Abs AdrOf And ArcCosine ArcSine ArcTangent As Bcd Bit Byte Call CBool CByte CDword CInt CLong Cosine CountDown CountUp CountRing CountReset CSng CWord Dec Dim DWord Else Elseif Endif Exp For Goto HiByte HiWord Integer If Inc Let LoByte Log Long LoWord Ln

Next Not Odd Or PackBit PeekBool PeekFloat PeekLong PeekWord PutChrono Pwr Rem Samplebyte Sampleword Sampledword Samplesingle SetBit Shl Shr Sine Single SplitBit Sqrt Step SwapByte Tablesize Tan Then TimerSS TimerMS TimerIN TimerOD TimerReset To TriggerNeg TriggerPos Truncate Xor Wend While Word


1.19. POU According to IEC1131-3 standard, the programs are organized in POU, which stands for ‘Program Organization Unit’ In order to organize the programming, 3 types of POU are available.

Programs give you the possibility to divide your project into several sub-programs (pump management, alarms, intrusion, ...) Each sub-program is POU Program.

Functions give you the possibility to create your own function. It is a piece of program leading to one result. Useful when there are repetitive calculations.

Function Blocks give you the possibility to create your own 'applet' or procedure (starting a pump, regulating temperature). It is a piece of program composed of input and output arguments. Useful when the same process is applied to different sets of I/O (eg. Management of a pump in an application handling 4 pumps).

Recursion is authorized but not for Function Block (A function cannot call itself): 1. We do not advise you use recursion 2. It is under your own responsibility


1.20. POU – Program Introduction

The Programs can be considered as sub-programs. They allow you to structure your BASIC project into several sub-programs. Practically, you have a BASIC program ‘main’, which calls sub-programs. These sub-programs correspond to an action such as: start pump, intrusion control, alarms management etc..., and can be called from any other Program. This architecture gives you a clear view of the whole project. The Programs can be tested individually and it makes changing easier. A Program can call another Program that can call another Program etc... If you use Programs that call other Programs, be careful to avoid loops: Programs 1 calling Program 2 calling Program 3 that calls Program 1.

1.20.1. The Program 'Main' The program 'main' is the root program. It must be unique and called ‘main’. It is used to call other Programs (sub-programs). It is the default program when starting a new TWinSoft document. The program ‘Main’ supports LADDER or BASIC language. It can be changed at the condition the Program is empty. Right click ‘main’, select ‘Properties’ and choose a language. Changing language of ‘Main’

To change the language of ‘Main’, right click the name ‘Main’, go to Properties and change language to

BASIC

While being in edition, it is possible from a program to jump directly another POU:

you select the name of the POU, press <CTRL> and double-click the name.


1.20.2. Creating a Program To create a Program, click the 'Programs' folder in the Project Workspace. In the window appears the list of existing POUs (all types of POU). When starting TWinSoft the first time, the only one is the 'main'.

Double click 'Add a POU', type a Name (No accent, space or keywords (see chapter 1.18)) and check the type 'Program'.

Select language BASIC

Click OK.

You have created a Program and it appears in the 'Programs' folder.

When you double click the name of the Program in the list, the window for BASIC edition appears with a new Tab for the current program.

You use standard BASIC language for programming.

1.20.3. Calling a Program A Program can be called from any other Program. It is important that finally, it is called from the 'Main' Program. • Syntax

To call a Program, use the syntax: call Alarms 'MyProgram is the name of the POU Program

The instruction Call is optional


1.21. POU – Function

Introduction A Function is a user-defined program that executes a calculation yielding to one result. It is useful when a calculation you regularly need to execute does not exist as Standard functions. You call it in Programs every time you need to execute the calculation. It has one or several inputs and only one output. When a Function is used many times in a Program, the same code is always executed; one cannot keep trace of internal status between 2 calls. According to the type of the output, there are 4 types of Functions:

BOOL :Boolean output. WORD :analog output 16 bits. LONG :analog output 32 bits. FLOAT :Floating point output.

Creating a Function To create a Function, click the 'Programs' folder in the Project Workspace. In the window appears the list of existing POUs (all types of POU). When starting TWinSoft the first time, the only one is the 'main'.

Double click 'Add a POU', type a Name (No accent, space or keywords (see chapter 1.18)) and check the type 'Function'.

Select the language BASIC

Select the type of the output (result of the calculation): BOOL, WORD, LONG or FLOAT.

Click OK.

You have created a Function and it appears in the 'Programs' folder.

Inputs can be digital (Boolean) or analog. Timers cannot be defined in a Function


When you double click the name of the Function in the list, the window for BASIC edition appears with a new Tab for the current program. Example of Function The following Function is an analog Function (it means the output is analog). It performs the percentage of an input value.

• The Tags

When creating a Function, TWinSoft automatically creates the 'Output' Tag. It is the unique Output allowed. 'Inputs' and 'Outputs' of the Function are the arguments that will be replaced when calling the Function (see next). You create then the 'Inputs', corresponding to the arguments of the Function. Be careful with the 'type' associated to the arguments. If you need 'local' Tags, you can create them from the list, or using the DIM statement. The way a POU Function works, involves that one can define only local Tags in a POU Function.

Percent: the output of the Function. It is unique and is the result of the

calculation.

MAX, MIN, VAL: are the Inputs of the Function.

Delta, scale: local analog Tags used as temporary variables necessary to calculate the percentage.

Global Timer and Counters are allowed in Function, but it is very uncommon and not logic.


• The programming

You use standard BASIC language for programming.

Calling a Function from a Program A Function is called from a Program • Syntax Result=Function(Arg1, Arg2, Arg3, ...) • Arguments

Result the Tag receiving the result of the Function Function the name of the Function Arg the input arguments (Tags or constant)

The Arguments have to be entered in the order they have been created in the list of Tags of the Function.

Example: Arg1 = Input Arg2 = MIN Arg3 = MAX ....

Example 'Call of Function: output=Percent(max,min,input) AIR0 = Percent(maximum, minimum, ana_0)

The column ‘Value’ in the list of POU Tags cannot be used. It displays random values. To check the Tags, look in the ‘list of Tags’ to the global Tags associated to the arguments.

POU Functions can be exported to a Library to be used in other TWinSoft documents, using the Library manager menu (see chapter 5: ‘The library manager’)


1.22. POU – Function Block

Introduction Function Blocks are user defined small 'applets', or procedures that perform a set of operations on a given set of I/Os (or registers). Function Blocks are particularly helpful when the same set of operations must be performed on several different sets of I/Os, figuring instances of a small process. eg.: The TBox needs to handle 4 identical pumps. No need to copy the same program 4 times. You call a Function Block from a Program every time you need to execute the process and you assign Tags to it. We advise you against using Functions in a Function Block. In fact, a Function exists only once and uses always the same internal variables when it is called. A Function Block uses new Tags (local and global) every time it is called from a Program.

Creating a Function Block To create a Function Block, click the 'Programs' folder in the Project Workspace. In the window appears the list of existing POUs (all types of POU). When starting TWinSoft the first time, the only one is the 'main'.

Double click 'Add a POU', type a Name (No accent, space or keywords (see chapter 1.18)) and check 'Function Block'.

Select the language BASIC

Click OK.

You have created a Function Block and it appears in the 'Programs' folder.


When you double click the name of the Function Block in the list, the window for BASIC edition appears with a new Tab for the current program. Example of Function Block The following Function Block performs the start of a digital output with a programmable delay. This Function Block implementation describes the inputs and outputs involved in the management of the delay. It also specifies how the dcelay is applied to the ouput. It does not specify which Tags are physically connected to the ‘delay’: this is the job of the FB calling in a program (see below).

• The Tags Inputs and Outputs of a Function Block are the arguments to be replaced when calling the Function Block. You create then the 'Inputs' and 'Outputs' in the list of POU Tags of the Function Block. If you need 'local' Tags, you can create them from the list, or using the DIM statement.

INPUT is a digital input that will activate the OUTPUT after the DELAY.

OUTPUT is a digital output. It will be connected to a motor, for instance when calling the Function Block.

DELAY is an analog input containing the number of seconds of the delay. It must be associated to the timer used in the Function Block.


Timer0 is a local timer.

value is a local digital Tag of the type 'Timer - Valaue'.

status is a local digital Tag of the type 'Timer - Status'.

Timer_preset is a local analog Tag of the type 'Timer - Preset'.

• The programming You use standard BASIC language for programming.

Calling a Function Block in a POU Program • Instantiation

A Function Block can be called several times, and for each call TWinSoft allocates new Tags. The Instantiation allows TWinSoft to distinguish each call. The Instantiation is done using a POU 'local' Tag. - From the Program where you wish to call the Function Block:

- In the list of POU Tag, click Add a POU Tag - Type a name as Tag (the instance name) - Select as ‘Type’ : FB Instance - Select as ‘Name’ the name of your Function Block - Click OK - The instance appears in the list of ‘POU Tag’.

Example of Instantiation:


• Syntax Call Instance(Arg1, Arg2, Arg3, ...)

• Arguments Instance the name given to the local Tag used as Instantiation Arg the input arguments (Tags or constant)

The Arguments have to be entered in the order they have been created in the list of Tags of the Function Block

Example 'The function block [Start_w_Delay] activates an output after a entered 'delay in seconds; Arguments: (Input,Delay,Output). call Motor1(DI_4, 6, DO_3, COUNT)

The instruction Call is optional

POU Functions can be exported to a Library to be used in other TWinSoft documents, using the Library manager menu (see chapter 5: ‘The library manager’)


2. Programs - Ladder

TBOX MS and TBOX LITE support 2 languages: BASIC and Ladder. Both languages are used to execute process automation

BASIC is a text language, very easy to use for making calculation. It supports all advanced mathematical functions.

LADDER is a graphical language, which should be preferred when Boolean

operations are required. LADDDER is much more efficient than BASIC for handling ‘digital’ Tags.

BASIC and LADDER can be used together We suggest that you divide your process into several programs (≅ sub-programs) depending on the process concerned. According to the kind of process, you create programs in BASIC and programs in LADDER. Then you combine programs, as you want: BASIC calling LADDER and reciprocal.

This chapter explains how to program in LADDER.

To see an example, load the TWinSoft document 'MSLadder.tws' that you find in the 'Samples' directory of TWinSoft.

2.1.1. Task sequence of the process Inputs are handled before starting the cycle Outputs are written at the end of the cycle Variables are handled immediately in the cycle

Sequence:

Reading DI If new second: Reading AI 1 CYCLE of Ladder/BASIC Writing DO If new second: writing AO Reading DI If new second: Reading AI 1 CYCLE of Ladder/BASIC ….


2.2. Ladder – Principle The principle of the Ladder diagram is based on an electrical description of the process or machine, using relay logic. To the left of the screen are the inputs (they are conditions for which an action will be undertaken) and to the right are the outputs (which result from these actions).

2.2.1. Inputs All inputs, whether digital or analog, can be combined to create logical equations: <AND> using several inputs on the same line <OR> using several inputs one above each other. All analog comparison functions and/or digital inputs on the same program line will represent true or false. The result defines the actions of the output (will or will not be performed). The different types of Input conditions are accessible in the LD Toolbar.

2.2.2. Outputs Digital output functions are engagements (SET relay) or disengagement (RESET relay), they can be the image or the opposite of the result of the tested input conditions (OUTPUT relay and NEGATIVE relay). Other functions have been introduced proper to telemetry like transmission of alarms, data logging, … To process analog variables, many mathematical functions and POU (Program Organization Units) functions have been implemented, but you might find easier to use BASIC for making calculation (see chapter 1: BASIC) The selection of different types of Output is accessible in the LD Toolbar.

Example of Ladder


2.2.3. Cycle time One cycle corresponds to a complete process (BASIC and LADDER), from the first until the last line. The cycle time is the time needed to execute on cycle. The cycles are executed permanently, one after each other. For question of security, one cycle can never be greater than 1 second. If this occurs, an internal watchdog timer resets the TBOX MS automatically. The cycle time is available from the ‘RTU Identification’, available from the main menu 'Communication'.

2.3. Ladder - Modes Introduction

The Ladder programming operates in two different modes. The first is display mode, which allows you to see the entire program, one page at a time. It is in this mode that you can see the state or the value of variables in real time. The second mode is edit mode, which allows inserting a new line anywhere in the Ladder, at the beginning, at the end or between two existing lines. This mode also allows modifying an existing line.

2.3.1. Display mode To access the Ladder in Display mode, click in the Project Workspace on the 'Programs' folder. The last Ladder that was opened is displayed. The white tab underneath indicates the active program. The tab 'MAIN' is the main program, that is automatically executed by the RTU; the other POUs having to be called from the ‘MAIN’. The Ladder diagram appears in red lines with the Tags associated at each input contact, output relay or IN/OUT of functions. The Comment lines appear as gray blocks. When a jump (JUMP) is programmed, the jump’s mnemonic appears at the right side of a double arrow. The mnemonic is a LABEL that appears in black text. A call to another program appears in a red block with one IN/OUT line. The state of the Boolean objects (input contacts, analog comparison, output relays) is displayed as a green overlay if the condition represented by the contact is true (in the case of a trigger input contact, the result represents the current state of the Tag. When moving the cursor on analog Tags in Functions or Math blocks, the current value is displayed in the bottom left corner of the screen. For digital gates the display indicates <On> or <Off> according to the current value.


2.3.2. Edit mode The Edit mode is used when inserting a new line or modifying an existing line. To insert a line, use the LD Toolbar. Three types of lines can be inserted using the following buttons:

to insert a line of Ladder

to insert a line of Comment

to insert a Label that will be called by a JUMP

The Ladder diagram is made of several lines that are numbered starting at 1. Only one line at a time can be edited with only one rung (a rung is a set of Input conditions connected to only one set of Outputs). When editing is finished, the line must be compiled to proceed with the next one:

To save and compile a line. If an error occurs, a dialog box informs you on the error. The key <+> can also be used to save and compile a line. If you were editing an existing line, you return to display mode. If you were inserting a new line, you stay in edit mode.

To quit editing and discard changes. The key <ESC> can also be used.

To select any item (line, contact, relays or Functions) of a Ladder line. Once selected it can be edited by a double click to replace Tags. You can also erase the selected item by pressing the key <Delete> or insert a new contact, relay or Function by selecting the proper icon in the LD Toolbar.

Inserting a new line as last line To insert a new line as last line, place the cursor at the end of the last line and click the icon corresponding to the type of line you wish to insert. Inserting a new line between 2 existing lines To insert a line between 2 existing lines, place the cursor on the existing line that the new line will correspond to. The new line will move the existing line to next position after it is inserted. When a line is selected, it is surrounded. Then click the icon corresponding to the type of line you wish to insert. The line you placed the cursor on will be moved downwards. Using the keyboard UP and DOWN arrows moves the selected line. Modifying an existing line To modify an existing line, place the cursor on the line you wish to modify. Then double-click it. The arrow icon of the LD Toolbar is automatically selected.


2.4. Ladder - Toolbar The LD Toolbar is the panel of tools necessary to edit Ladder. Different icons are active according to the current mode of Ladder:

2.4.1. Display mode Clicking one of the following icons lets you enter in the edit mode:

To insert a line of Ladder.

To insert a line of Comment.

To insert a Label that will be called by a JUMP.


2.4.2. Edit mode

To Select any item (line, contact, relays or Functions) of a Ladder line. Once selected it can be edited by a double click to replace Tags. You can also erase the selected item by pressing the key <Delete> or insert a new contact, relay or Function by selecting the proper icon in the LD Toolbar.

To Save and Compile a line. If an error occurs, a dialog box informs you of the error. The key <+ >can also be used to save and compile a line.

To Quit editing and discard changes. The key <ESC> can also be used.

To insert a Normal input contact for digital input. The condition will be true if the input is active.

To insert an Invert input contact for digital input. The condition will be true if the input is inactive.

To insert a Positive input trigger for digital input. The condition will be true only once when the input passes from an inactive level to an active level.

To insert a Negative input trigger for digital input. The condition will be true only once when the input passes from an active level to an inactive level.

To insert a Digital output normal. Output is activated if the results of the input condition(s) are true.

To insert a Digital output inverted. Output is activated if the results of the input condition(s) are false.

To insert a Digital output set. Output is set and memorized if the result of the input condition(s) are true; this type of output is typically used with a 'trigger' input

To insert a Digital output reset. Output is reset and memorized if the result of the input condition(s) are true; this type of output is typically used with a 'trigger' input

To draw continuous horizontal or vertical lines. To join inputs conditions together to create logical equations and to possibly connect to many outputs. WARNING: a set of inputs can only lead through one horizontal line to only one set of outputs. It is called a rung.

To insert a Program, Function or Function Block. A list opens with the standard Functions (under the folder 'Standard') and with the user defined Programs, Function and Function Block (under the folder 'This file')

To insert a Mathematical block. In this block, mathematical functions can be inserted by clicking on 'New Math Function'. See the list of available functions in chapter 2.9.

Initiates a Jump to the line whose label corresponds to the one that is entered here (to enter a label, see above in the list of icons of 'Display mode').


2.5. Variables Introduction

Variables can be physical I/O, internal variables: analog (AIV) or digital (DIV) and system variables. A variable becomes available when it is declared as a Tag. According to the use we make of the variables in Ladder programming, there are two families of Tags:

Local Tags Global Tags

2.5.1. Local Tags A Local Tag is a non-specific register used as temporary value in a calculation. When compiling the TWinSoft document a free memory zone (DIV or AIV) is assigned to it according to its type. Local Tags are only used in the POU where they have been created. They appear in the list of Local Tags, above the Ladder diagram of the POU (see next).

2.5.2. Global Tags A Global Tag can be of two types:

A specific variable (DIV, AIV, system variable, communication variable) that you wish to use. A physical I/O of the RTU created in the List of Tags.

Global Tags can be used in any POU Program and Function Block (see next).

2.5.3. The colors of the Tags The color used to display the Tag in Ladder programming informs you of its type:

Black: Global Tag. Blue: Local Tag. Brown: System variable (analog or digital). It is always considered as Global Tag


2.6. Create Ladder Diagram Introduction

Creating Ladder diagram consists of 'drawing' program lines with input contacts or functions and output relays or functions placed between 2 vertical Power Rails. The two rails can be considered as electrical wires between which items are placed. The lines as a whole represent your local automation.

In the LD Toolbar click - - to insert a new Ladder Line. In the window of Ladder programming, a rectangle appears with a line number. Only one line at a time can be edited with only one rung (a rung is a set of Input conditions connected to only one set of Outputs). The grid shows you the places where you can place contacts, relays and functions. The Ladder is executed from left to right and from top to bottom. Each input is read before executing the Program and the value stored to be used all along the Program. On the same way, each output is saved and executed only at the end on the Program. Be careful when using an output at different places in the Program, unless you do SET and RESET. To help you, check the Cross reference of the Tags.

According to the item you wish to use, select the proper icon in the Toolbar.

To get used to ladder programming, go to chapter 2.7. Step by step creating of ladder and chapter 2.8. Drawing lines in ladder…


2.6.1. Inserting items When inserting an item, you must declare the variable(s) associated to it: Digital Tag for a contact and a relay, Digital or Analog Tags for Functions. You have to work with Tags. A Tag (local or global) can be created while inserting an item. There are two possibilities to select a Tag:

The Tag exists

- You know the name of the Tag: you type its name. TWinSoft is not case sensitive, so you can type it in capital or small letters.

- You don’t know the name of the Tag: you click the button to open the list of Tags. You have the choice between Global Tag, Local Tag and System variables (see previous chapter ‘Variables’).

The Tag does not exist You type its name and press <ENTER> to create it. The Tag can be either Local Tag or Global Tag (see previous chapter ‘Variables’).

2.6.2. The colors of the Tags The color used to display the Tag in Ladder programming informs you of its type:

Black: Global Tag. Blue: Local Tag. Brown: System variables (analog or digital). It is always considered as Global Tag

2.6.3. The Keys

<+> To compile a line. Similar to the icon

<ESC>

- When a line is selected: to quit edit mode. Similar to the icon

- When an item is selected: to release the item and return to selection mode (arrow).

- When Tag box is opened: to carry on without specifying a Tag. '???' will be inserted instead. To enter a Tag afterwards, double click '??? '

<DEL> To delete the selected item.

According to the field you are in, you can select a Tag (digital or analog) or directly type a constant. Check the title of the insertion window; it informs you on what you can use.


2.7. Step by step creating of Ladder

We assume that Tags already exist and that we work with global Tags.

Suppose we are controlling a Reservoir LEVEL. When it reaches the value 150, we start the PUMP to remove water. At the same time, we start a Timer INTEGRAL that memorizes the number of minutes the pump has been working. The PUMP can also be started manually. When 100 hours are reached (360000 seconds), the status of the timer changes to 1 and activates the output MAINTENANCE. We will create the following lines:

We use the following Tags (see TBox manual chapter 10: Tags):

Level analog input (Float) Manual digital input. Pump digital output. Timer_Status digital internal variable associated to the timer ‘Qty_minutes’ Maintenance digital output. Reset digital input.

List of Tags in TWinSoft

List of Timers in TWinSoft


If you encounter difficulties in drawing lines, go to chapter 2.8. Drawing Lines in Ladder…

1st line of Ladder:

1. In the program ‘MAIN’, click the icon to insert a line of comment. Type you text and click ‘OK’.

2nd line of Ladder:

2. Click the icon to insert a new line. The edit block is ready to create the second line. The grid shows the position where you can place the items.

3. Click the icon to insert the function A>B and then click next to the left Rail.

4. Enter the Tag LEVEL or select it from the list of Tags and then enter the constant 150.

5. Click the icon to insert a digital contact, then click below the comparison Function close to the left rail.

6. Enter the Tag MANUAL or select it from the list of Tags.

7. Click the icon and draw a horizontal and vertical line to join the output of the comparison Function.

8. Click the icon to insert an output relay, then click on the output of the comparison Function. A horizontal line including the relay is automatically drawn to the right rail.

9. Enter the Tag PUMP or select it from the list of Tags.


10. Click the icon , go to the folder ‘Timers’ and select the timer Integral (TI).

11. Type the name of the Timer (instance name), or if it exists, you can browse it from the

button

12. Type the Preset of 360000 (= 100 hours). Preset is always expressed in seconds.

13. Click the icon and draw a horizontal and vertical line to join the timer Function to the right rail and to the output of the comparison Function.

14. Press the key <+>, or click the icon to compile the line. Doing this, the edition block is ready to create the third line.

3rd line of Ladder:

15. Click the icon to insert a Positive edge trigger contact, then click next to the left rail.

16. Enter the Tag TIMER_STATUS.

17. Click the icon to insert a SET output relay, then click next to the right side of the contact TIMER_STATUS. A horizontal line including the relay is automatically drawn to the right rail.

18. Enter the Tag MAINTENANCE or select it from the list of Tags.

19. Press the key <+>, or click the icon to compile the line. Doing this, the edition block is ready to create the fourth line.


4th line of Ladder:

20. Click the icon to insert a Positive edge trigger contact, then click next to the left rail.

21. Enter the Tag RESET or select it from the list of Tags.

22. Click the icon to insert the reset timer Function, then click next to the contact RESET.

23. Type the name of the Timer or select it from using the browse button .

24. Click the icon and then click the reset timer Function; drag it one step to the right.

25. Click the icon and draw a horizontal line between the RESET contact and the reset timer Function.

26. Click the icon to insert a output relay associated to the Tag MAINTENANCE, then click under the reset timer Function. A horizontal line is automatically drawn to the right rail.

27. Enter the Tag MAINTENANCE or select it from the list of Tags.

28. Click the icon and draw a horizontal and vertical line to join the input contact to the output relay MAINTENANCE.

29. Press the key <+>, or click the icon to compile the line. Doing this, the edition block is ready to create the next line.

30. Press <ESC> to return to Display mode.


2.8. Drawing lines in ladder …. You might find difficulties in drawing line, then it is important you understand the rules:

• To draw a line, you drag the cursor until the end. • You draw horizontal and vertical line after each other. • With the cursor inside a cell, the line is drawn when you cross to the next cell.

Select the tool ‘Line’ from the LD toolbar Place the cursor inside the cell and maintain the left button of the mouse …

… drag the mouse to the right. When you cross to the cell next, a black line appears…

…when you have reached the end of the horizontal line, release the button. The line changes to red color. To continue, at the cursor position maintain the left button of the mouse …

… drag the mouse to the bottom. When you reach the bottom of the cell a black line appears…

…when you have reached the end of the vertical line, release the button. The line changes to red color. To continue, at the cursor position maintain the left button of the mouse …

… drag the mouse to the right. When you cross to the cell next, a black line appears…

…when you have reached the end of the horizontal line, release the button. The line changes to red color.

That’s it !


2.9. Functions Ladder provides a series of pre-defined functions to perform operations like Comparisons, Assignment, Boolean operations,.… Ladder provides also Timer functions (for counting time) and Counter functions (for counting pulses). Almost all functions have the 2 connections: - EN: Enable Input: Connection to the Ladder line. EN must be TRUE to perform

the Function.

- ENO: Enable Output: it is the image of EN. If EN is TRUE, ENO is TRUE. It can be connected to a contact or a relay, a Mathematical block or another Function.

To insert a Function, in the edit mode of Ladder Programming, click the icon of the LD Toolbar. The functions are divided into several folders:


2.9.1. Analog Comparison Functions Those functions represent input conditions used to carry out comparisons between 2 analog variables.

The output is TRUE when the input values fit with the comparison, otherwise it is FALSE. The output can be connected to a relay, a Math Block, another Function or a POU. The parameters are:

- EN: Connection to the Ladder line. EN must be TRUE to perform the Function.

- A, B: Inputs : analog Tags (Byte, Word, Long or Float) or constant.

- OUT: Digital Output of the Function: TRUE when A & B fit with the Function selected and EN is TRUE. It can be connected to a relay, a function or a mathematical block

When ana0 equal ana1, OUT is TRUE

When ana0 is smaller than ana1, OUT is TRUE

When ana0 is bigger than ana1, OUT is TRUE

When ana0 is smaller or equal than ana1, OUT is TRUE

When ana0 is bigger or equal than ana1, OUT is TRUE

When ana0 is different of ana1, OUT is TRUE

2.9.2. Special Functions

Writing of the digital Tag 'dig0' in the Digital Chronology.

Writing of the analog Tag 'ana0' in the Analog Chronology.


2.9.3. Timer & Counter Functions See chapters 3 and chapter 4

2.9.4. Math. Assignments functions The parameters are:

- A: Input : analog Tag or constant.

- Q: Output : analog Tag of the Function.

Q = A: the Tag 'anaOUT' contains a copy of the value of the Tag anaIN'

Q = -A: the Tag 'anaOUT' contains the invert value of the Tag 'anaIN'

Q = low(A): the Tag 'anaOUT' contains a copy of the 8 lowest bits of the Tag 'anaIN' A and Q must be WORD

Q = high(A): the Tag 'anaOUT' contains a copy of the 8 highest bits of the Tag 'anaIN' A and Q must be WORD

Q = abs(A): the Tag 'anaOUT' contains a copy of the absolute value of the Tag 'anaIN' A and Q must be WORD

High-LowQ = Low-HighA: the Tag 'anaOUT' contains the inversion of the 8 highest bits and the 8 lowest bits of the Tag 'anaIN' A and Q must be WORD

in(A): increase by 1 bit the Tag 'anaIN'.

dec(A): decrease by 1 bit the Tag 'anaIN'.


2.9.5. Math. Arithmetic functions The parameters are:

- A, B: Inputs : analog Tags (Byte, Word, Long or Float) or constant.

- Q: Output : analog Tag (Byte, Word, Long or Float).

The Tag 'anaOUT' is the addition of the Tags 'ana0' and 'ana1'

The Tag 'anaOUT' is the subtraction of the Tags 'ana0' and 'ana1'

The Tag 'anaOUT' is the multiplication of the Tags 'ana0' and 'ana1'

The Tag 'anaOUT' is the division of the Tags 'ana0' and 'ana1'

The Tag 'anaOUT' is the rest after the division of the Tags 'ana0' and 'ana1'. Example: 2 = 17 MOD 3

2.9.6. Math. Bitwise functions The parameters are

- A, B: Inputs : analog Tag (Word only) or constant.

- Q: Output : analog (Word only) or digital Tag, according to the Function.

- Bit: Input : digital Tag of the Function

- Index: Input : constant between 0 and 15

- Word: Input or Output : analog Tag, according to the Function

'anaOUT' is the result of the logical AND between 'ana0' and 'ana1' Example: 0001000011111111 AND 0001100000001111 0001000000001111

'anaOUT' is the result of the logical OR between 'ana0' and 'ana1' Example: 0000000011111111 OR 1111000000001111 1111000011111111

'anaOUT' is the result of the logical XOR between 'ana0' and 'ana1' Example: 0000000011111111 XOR 1111000000001111 1111000011110000


The status of digital Tag 'dig0' will be copied in the analog Tag 'anaOUT' at the position indicated by the Index. Example: dig0: 1 Index: 3 anaOUT: 0011010011001001

The status of the bit of the analog Tag 'ana0' indicated by the Index will be copied in the digital Tag 'digOUT'. Example: ana0: 1100101000010010 Index: 5 dig0: 0

2.9.7. Math. Shift functions The parameters are:

- IN: Input : analog Tag. It is a Word or a Byte according to the Function

- Bit: Constant : number of bits to shift

- Q: Output : analog Tag (Word) of the Function

Wraparound means that the bits scrolling out from one side of a Byte (8 bits) or Word (16 bits) are copied at the other side of the byte or word.

'anaOUT' has the number of 'Bit' shift to the left (max. 15) of the Word analog Tag 'ana0' (without wraparound).

'anaOUT' has the number of 'Bit' shift to the right (max. 15) of the Word analog Tag 'ana0' (without wraparound).

'anaOUT' has the number of 'Bit' shift to the left (max. 7) of the Byte analog Tag 'ana0' (with wraparound).

'anaOUT' has the number of 'Bit' shift to the right (max. 7) of the Byte analog Tag 'ana0' (with wraparound).

'anaOUT' has the number of 'Bit' shift to the left (max. 15) of the Word analog Tag 'ana0' (with wraparound).

'anaOUT' has the number of 'Bit' shift to the right (max. 15) of the Word analog Tag 'ana0' (with wraparound).


2.10. Mathematical Block A mathematical Block allows carrying out analog output operations like assignement, arithmetic operations, comparisons, Boolean operation, indirect addressing, …

To insert a Math block, in the edit mode of Ladder Programming, click the icon of the LD Toolbar.

2.10.1. Introduction There are 7 categories of mathematical functions available (to use in math blocks):

• Assignments • Arithmetic operations. • Comparisons. • Bit manipulations. • Boolean Operations. • Conversion + Indirect addressing. • Miscellaneous.

In the functions, the Arguments to replace by Tags (or constant) are represented as follows:

- A, B, C, and D Analog Tags. Depending on the functions the Tags can be: - Combination of any type of Tags (Byte, Word, Long, Float).

TWinSoft will automatically converts to the type of the Tag ‘Result’.

- Limited to Byte or Word (obvious according to some functions like Rotation, conversion of 16xBool to a Word, …)

- Ptr Pointer

Doing indirect addressing, it is an Analog Tag

- BOOL Digital Tag

An assignment operation is always executed from the right to the left. In other words, we have:

result = operation

or: output = input (meaning the value of Input variable is copied in the Output variable).

When calculations are concerned, we advise the use of BASIC; being a text language, you may find it more user-friendly. Another reason is that advanced mathematical functions are only available with BASIC (SIN, COS, POWER, …)


Examples of typecasting The typecasting is specifically required when doing arithmetic operations.

Long = Long + Float Long = Long + 12.365

The ‘Input’ arguments are converted to the format of the ‘Output’ (result). In those examples it means that the Float (or constant) is first converted to Long before executing the operation

Long = Word + Word Long = Word * Word

In case the result of the operation is > 65535, TWinSoft presumes the result will go to a Long. Be sure the Tag receiving the result is of format Long

Word = Float + Float

The result is in Word with the addition of the Float rounded

Word = Long AND Word

The result is in Word

To insert a 'Math function' between 2 existing functions in a Math block, edit the line, place the cursor at the position you want to insert the function, and press the key <Insert> of keyboard.

About Typecasting Typecasting means the conversion of a variable’s data type to another data type, for instance the conversion from Float to Long. TWinSoft executes typecasting to optimize the calculation, to be sure of the result.

(See examples here below)


2.10.2. Assignments A = B 'A' contains a copy of the value of 'B'

A = -B 'A' contains the invert value of 'B'

A = Low(B) If B is a WORD: 'A' contains a copy of the 8 lowest bits of 'B' If B is a LONG: 'A' contains a copy of the 16 lowest bits of 'B'

A = High(B) If B is a WORD: 'A' contains a copy of the 8 highest bits of 'B' If B is a LONG: 'A' contains a copy of the 16 highets bits of 'B

A = Abs (B) 'A' contains a copy of the absolute value of 'B'

A = Swap(B) 'A' contains the inversion of the 8 highest bits and the 8 lowest bits of 'B' Example: B = 256 (00000001 00000000) A = 1 (00000000 00000001)

inc (A) increase the value of Tag 'A' by 1 unit

dec (A) decrease the value of Tag 'A' by 1 unit

2.10.3. Arithmetic operations A = B + C 'A' is the addition of 'B' and 'C'

A = B - C 'A' is the subtraction of 'B' and 'C'

A = B * C 'A' is the multiplication of 'B' and 'C'

A = B / C 'A' is the division of 'B' and 'C'

A = B * C / D 'A' is the result of the multiplication of ‘B’ and ‘C’, divided by ‘D’. Particularly useful to execute scaling with one function.

A = B AND C 'A' is the result of the logical AND between 'B' and 'C' Example: 0001000011111111 AND 0001100000001111 0001000000001111

A = B OR C 'A' is the result of the logical OR between 'B' and 'C' Example: 0000000011111111 OR 1111000000001111 1111000011111111

A = B XOR C 'A' is the result of the logical XOR between 'B' and 'C' Example: 0000000011111111 XOR 1111000000001111 1111000011110000

A = B MOD C 'A' contains the rest after the division of 'B' and ‘C’. Example: 2 = 17 MOD 3

When doing logical operations, check you don’t work with Float variable. There is no linear sequence in the binary format of Float register, like with Word or Long.


2.10.4. Comparisons BOOL = B == C 'BOOL' is TRUE if 'B' equal 'C', otherwise it is FALSE

BOOL = B < C 'BOOL' is TRUE if 'B' is smaller than 'C', otherwise it is FALSE

BOOL = B > C 'BOOL' is TRUE if 'B' is greater than 'C', otherwise it is FALSE

BOOL = B <= C 'BOOL' is TRUE if 'B' is smaller than or equal to 'C', otherwise it is FALSE

BOOL = B >= C 'BOOL' is TRUE if 'B' is greater than or equal to 'C', otherwise it is FALSE

BOOL = B <> C 'BOOL' is TRUE if 'B' and 'C' are different, otherwise it is FALSE

BOOL = odd B 'BOOL' is TRUE if the value of 'B' is odd, otherwise it is FALSE

2.10.5. Bit manipulations Wraparound means that the bits scrolling out from one side of a byte (8 bits) or word (16 bits) are copied at the other side of the byte or word. bit (A,BitNb) = BOOL The status of digital 'BOOL' will be copied in the analog 'A' at the

position indicated by 'BitNb', starting with ' 0 ' for Lsb. Example: Bit: 1 BitNb: 3 A: 0011010011001001

BOOL = bit( A,BitNb) The status of the bit of the analog 'A' indicated by 'BitNb' will be copied in the digital 'BOOL', starting with ' 0 ' for Lsb. Example: A: 1100101000010010 BitNb: 5 Bit: 0

A = shl(B,shift) 'A' has the number of Bits indicated by 'shift' shift to the left (max. 15) of the Word 'B' (without wraparound). Example: B: 0000000011111111 Shift: 4 A: 0000111111110000

A = shr(B,shift) 'A' has the number of Bits indicated by 'shift' shift to the right (max. 15) of the Word 'B' (without wraparound). Example: B: 0000000011111111 Shift: 4 A: 0000000000001111

A = rol byte(B,shift) 'A' has the number of Bits indicated by 'shift' shift to the left (max. 7) of the Byte 'B' (with wraparound).

A = ror byte(B,shift) 'A' has the number of Bits indicated by 'shift' shift to the right (max. 7) of the Byte 'B' (with wraparound).


A = rol word(B,shift) 'A' has the number of Bits indicated by 'shift' shift to the left

(max. 15) of the Word 'B' (with wraparound). Example: B: 0000000011111111 Shift: 4 A: 0000111111110000

A = ror word(B,shift) 'A' has the number of Bits indicated by 'shift' shift to the right (max. 15) of the Word 'B' (with wraparound). Example: B: 0000000011111111 Shift: 4 A: 1111000000001111

2.10.6. Boolean operations BOOL = not(BOOL) the inverse of the digital Tag of the right is assigned to the digital

Tag of the left

BOOL = BOOL AND BOOL the result of the logical AND between the two digital Tags of the right is assigned to the digital Tag of the left

BOOL = BOOL OR BOOL the result of the logical OR between the two digital Tags of the right is assigned to the digital Tag of the left

BOOL = BOOL XOR BOOL the result of the logical XOR between the two digital Tags of the right is assigned to the digital Tag of the left


2.10.7. Conversion + Indirect addressing A = bcd(B) transforms the Word 'B' to a BCD format and transfers the result to the

Word 'A'. 'B' must be of maximum 39321 (corresponding to 9999) to prevent an overflow condition. BCD format means that each 4 bits is considered as an entity corresponding to 1 number.

Example: binary: 0001 0010 0011 0100 BCD 1234 decimal: 4660

A = 16 x (BOOL) places the 16 digital variables of successive addresses, starting with the digital Tag 'BOOL' in the Word' A'.

Example: to copy 16 digital inputs of an extension card in a word.

WARNING: when using this function, check that there are 16 successive ModBus addresses, starting from the Tag ‘BOOL’

16 x (BOOL) = A places the 16 bits of the Word 'A' in the 16 digital variables of successive addresses, starting with the digital Tag 'BOOL'.

Example: to SET or RESET 16 DO of an extension card using an analog variable.

A = FloatToInt (Flt * 10 E Const) conversion from the Float 'Flt' to the Integer 'A' ,

with a possible scaling from 10E-4 to 10E+4. The exponent must be a constant:'Const'.

Flt = IntToFloat (A) * 10 E Const) conversion from the Integer 'A' to the Float 'Flt', with a possible scaling from 10E-4 to 10E+4. The exponent must be a constant:'Const'.

BOOL = indirect (Ptr) the Tag or Constant 'Ptr' contains the ModBus address of the digital variable that will have its status assigned to the digital Tag 'BOOL'.

Example: to read the status of an output 'Q0' having ‘32’ as ModBus address: DIV0 = indirect (Pointer). (Pointer = 32)

Indirect (Ptr) = BOOL the status of the digital Tag 'BOOL' will be copied in the digital variable whose ModBus address is defined in the Tag or Constant 'Ptr'.

Example: to write the status of DIV0 to the output 'Q2' having ‘34’ as ModBus address: Indirect (Pointer) = DIV0. (Pointer = 34)

When using the two above functions, check that there are 16 Tags with successive ModBus addresses, starting from the Tag ‘BOOL’


A = indirect (Ptr) the Tag or Constant 'Ptr' contains the ModBus address of the analog

variable that will have its value assigned to the analog Tag 'A'

Example: to read the value of the input 'ana0' having 64 as ModBus address: AIV0 = indirect (Pointer). (Pointer = 64)

indirect (Ptr) = A the value of the analog Tag 'A' will be copied in the analog variable whose ModBus address is defined in the Tag or Constant 'Ptr'.

Example: to write the value of ‘ana0’ to the analog output having as ModBus address 288: Indirect (Pointer) = ana0. (Pointer = 288)

2.10.8. Miscellaneous Adr = Tag (Tag) Gives you the ModBus address of the ‘Tag’.

Number between 1 and 65535

put Bit in dig chrono Writing of the digital Tag 'Bit' in the Digital Chronology.

put A in ana chrono Writing of the analog Tag 'A' in the Analog Chronology.


2.11. POU (Program Organization Units) IEC1131-3 Ladder programming is organized not only with contacts and relays, but also with different POUs and functions. Three types of POU are available, all of which use the same Ladder programming tools and BASIC instructions: List of POU

POU program: sub-program that is called in the ‘Main’ program or any other POU program.

POU function: standard functions (comparison, math. Functions, timers,...) or user defined functions. POU function block: user defined small 'applet' that performs a function (start of a pump, regulating temperature...)

Recursion is authorized but not for Function Block (A function block cannot call itself): 1. We do not advise you use recursion, because of

cycle time issue. 2. It is under your own responsibility


2.12. POU – Program

Introduction POU programs allow you to structure your Ladder program into several sub-programs. In practice, you have a main Ladder program, which calls sub-programs. These sub-programs contained within a Ladder diagram precisely define an action such as; start pump, intrusion control, alarms management...etc, and can be called from anywhere in the ‘Main’ program or any other POU program. They give you a clearer view of the whole automation program, they can be tested individually and allow you to make things easier for changing. A POU program can call another POU Program that can call another POU Program etc...

If you use POU Programs that call other POU Programs, be careful to avoid loops: like Program 1 calling Program 2 calling Program 3 that calls Program 1.

2.12.1. The Program 'Main' The program 'main' is the root program. It must be unique and called ‘main’. It is used to call other Programs (sub-programs). It is the default program when starting a new TWinSoft document.

The program ‘Main’ supports LADDER or BASIC language. It can be changed at the condition the program is empty. Right click ‘main’, select ‘Properties’ and choose a language.

2.12.2. Creating a POU Program To create a POU Program, click the 'Programs' folder in the Project Workspace. In the right window appears the list of existing POUs (all types of POU). When starting TWinSoft the first time, the only one is the 'main'.

Double click 'Add a POU', type a Name (No accent, space or keywords (see BASIC)) and check 'Program'.

Click OK.

You have created a POU Program and it appears in the 'Programs' folder.


When you double click the name of the Program in the list, the window for Ladder programming appears with a new Tab for the current Program.

Now you can create a Ladder Diagram for the Program you have defined.

2.12.3. Calling a POU Program in another Program To call a POU Program, click the icon in the LD Toolbar. In the folder, 'This File' select the POU Program you wish to insert. All POU Programs have the following parameters: - EN:

Enable Input: Connection to the Ladder line. EN must be TRUE to run the Program. If it is connected directly to the left rail, it will be executed at each cycle of the Ladder, otherwise it can be connected to an input condition.

- ENO:

Enable Output: it is the image of EN. If EN is TRUE, ENO is TRUE. It is usually connected to the right rail but can be also connected to a contact or a relay, a Mathematical block or a Function.

Calling a POU Program is like calling a sub-routine. The program associated to it is executed at the position where it is called.


2.13. POU – Function

Introduction A POU Function is a user-defined piece of Ladder that executes a calculation ending in one result. It is useful when a calculation you regularly need to execute does not exist in the list of Standard Functions. You use it in POU Programs every time you need to execute the calculation. It has one or many inputs and only one output. When a Function is used many times in a POU Program, the same code is always executed.

Example: You need regularly to execute the calculation: y= [(a+b) * (c+d)] /2. You will not find this formula in the Standard Functions or in the Mathematical Function block. You will then create your own Function that will execute your calculation every time you call it.

According to the type of the output, there are 4 types of Functions: BOOL: digital output. INT: analog 16 bits output. LONG: analog 32 bits output. FLOAT: floating point output.

An example of user defined Function is available in the TWinSoft document ‘Ladder.tbox’, in the 'Samples' directory of TWinSoft. The Function executes the scaling of an 8-bit analog input.

2.13.1. Creating a POU Function To create a POU Function, click the 'Programs' folder in the Project Workspace. In the right window appears the list of existing POUs (all types of POU). When starting TWinSoft the first time, the only one is the 'main' POU Program.


Double click 'Add a POU', type a Name (No accent, space or keywords (see BASIC)) and check 'Function'. Select the language Ladder Select the type of the output (result of the calculation): BOOL , WORD, LONG or FLOAT.

Click OK.

You have created a POU Function and it appears in the 'Programs' folder. When you double click the name of the Function in the list, the window for Ladder programming appears with a new Tab for the current Function.

Now you can create Ladder Diagram for the Function you have defined.

1. By default, the name of the Output is the name of the Function. You can rename the output by using the context menu on its name (mouse right clicking on the name).

2. POU Functions can be exported in a Library to be used in other TWinSoft documents, using the Library manager menu


2.13.2. Example of a Function The following Function is an analog Function (it means the output is analog). It performs the percentage of an input value.

The Tags : When creating a Function, TWinSoft automatically creates the 'Output' Tag. It is the unique Output allowed. Inputs and the Output of a Function are the arguments to be replaced when calling the Function. The way a POU Function works, involves that one can define only local Tags in a POU Function.

Percent: the output of the Function. It is unique and is the result of the

calculation.

MAX, MIN, VAL: are the Inputs of the Function.

Delta, scale: local analog Tags used as temporary variables necessary to calculate the percentage.

The Ladder : A math block using 3 functions is used.

Global Timer and Counters are allowed in Function, but it is very uncommon and not logic.


2.13.3. Calling a POU Function in a POU Program To call a Function, click the icon in the LD Toolbar. The folder, 'This File' contains Functions and Function Blocks created in the current document. If the Function owns to a Library, the latter appears as a Folder. Select the Function you wish to insert. All Functions have the following parameters:

- EN:

Enable Input: Connection to the Ladder line. EN must be TRUE to perform the Function. If it is connected directly to the left rail, it will execute at each cycle of the Ladder, otherwise it can be connected to an input condition.

- ENO:

Enable Output:

if the Function is Analog: it is the image of EN. If EN is TRUE, ENO is TRUE. It is usually connected to the right rail but can be also connected to a contact or a relay, a Mathematical block or another Function.

if the Function is Digital: ENO and the Output of the Function are linked inside the Function. It is TRUE if the result of the calculation AND EN are TRUE. It must then be connected to contact or a relay, a Mathematical block or another Function.

When calling the Function in a POU Program, you must assign to the (unique) Output a Tag and for each Input a Tag or constant. All inputs are at the left side of the Function; the output at the right side. In this example, we wish to have the percentage of input ‘ANA_0’ on the range between 0 and 500.


2.14. POU - Function block Introduction

POU function Blocks are user defined small 'applets' that performs a function (start of a pump, regulating temperature...). If this function is repetitive in your program and you don't wish to define it every time you need it, then you create it once as a POU Function Block, with Input and Output arguments. You call it in POU Programs every time you need to execute the function and you assign Tags of your program to the arguments of the Function Block. We advise you against using POU Functions in a POU Function Block. In fact, a POU Function exists only once and always has the same variables that are used when inserting the POU Function. A POU Function Block uses new resources (Tags, Timers, …) every time it is called in a POU Program.

2.14.1. Creating a POU Function Block To create a POU Function Block, click the 'Programs' folder in the Project Workspace. In the right window appears the list of existing POUs (all types of POU). When starting TWinSoft the first time, the only one is the POU Program 'main'.

Double click 'Add a POU', type a Name (No accent, space or keywords (see BASIC)) and check 'Function Block'. Click OK. You have created a POU Function Block and it appears in the 'Programs' folder.


When you double click the name of the Function Block in the list, the window for Ladder programming appears with a new Tab for the current Function Block.

Now you create Ladder Diagram for the Function Block you have defined.

POU Function Blocks can be exported to a Libraryto be used in other TWinSoft documents, using the Library manager menu (see chapter 5: ‘The library manager’)


2.14.2. Example of a Function Block The following Function Block performs the start of a digital output with a programmable delay.

The Tags: Inputs and Outputs of a Function Block are the arguments to be replaced when calling the Function Block.

INPUT is a digital input that will activate the OUTPUT after the DELAY.

OUTPUT is a digital output. It will be connected to a motor, for instance when calling the Function Block.

DELAY is an analog input containing the number of seconds of the delay. It must be associated to the timer used in the Function Block.

Timer is a local timer.

Timer_preset is a local analog Tag of the type 'Timer - Preset'.

Timer_status is a local digital Tag of the type 'Timer - Status'.

The Ladder : The DELAY is copied in the preset of the timer and multiplied by 1000 (the timer

preset is expressed in milliseconds). When INPUT changes to 1, it starts the timer Single Shot

Note: when working with an external Preset (the local variable 'Timer_preset'), the Preset of the timer can be set to any value; it is not used. Here = 0 When the timer has finished counting AND INPUT is still active, the output is set. A negative edge on INPUT resets the OUTPUT.


2.14.3. Calling a POU Function Block in a POU Program To call a Function Block, click the icon on the LD Toolbar. The folder, ‘This File’ contains Function Blocks and Functions created in the current document. If the Function Block owns to a Library, the latter appears as a Folder. Select the Function Block you wish to insert. All Function Blocks have the following parameters:

- EN:

Enable Input: Connection to the Ladder line. EN must be TRUE to perform the Function Block. If it is connected directly to the left rail, it will execute at each cycle of the Ladder, otherwise it can be connected to an input condition.

- ENO:

Enable Output: it is the image of EN. If EN is TRUE, ENO is TRUE. It is usually connected to the right rail but can be also connected to a contact or a relay, a Mathematical block or another Function.

When Calling the Function Block in a POU Program, you are asked to enter an 'FB Instance name' (in this example ‘Motor1’). This name allows TWinSoft to distinguish between Function Blocks, when multiple calls of similar Function Blocks are defined. Afterwards you must assign to the Output(s) and Input(s) Tags or constant. All inputs are at the left side of the Function Block, all outputs at the right side. In this example, the FB is called ‘Motor1’, the input ‘D0’ activate the output ‘Q2’ with a delay of 5 seconds. Each call of Function Block is unique and different from each other; local Tags of the Function Block as well as timer and counter, will be assigned to free registers, timers and counters when compiling.

1. A Function Block accepts maximum 16 Arguments.

2. There is no limit in the quantity of Timers and Counters used in a Function Block.


2.14.4. Debugging of a Function block As explained above, the same piece of Ladder of the POU FB can be called several times (several instances). In order to debug a function block, to check values and status of the local Tags, it is not sufficient to enter the code of the FB, because TWinSoft needs to know which instance concerned is. IMPORTANT:

1. The document must have been sent to TBox with the last changes 2. If TWinSoft is opened after the document has been sent, the document must be

compiled, to allow TWinSoft assigning registers to the local Tags. 3. The complete path from the Program 'main' must be followed to access the FB.

Example: 'Main' -> 'Motors' -> FB 'Motor1'. To debug the FB, while in 'Vizualization mode', double click the call of the FB from the POU program it is used:

The source code (Ladder) of the FB is then opened and dynamized according to its instance. In the list of POU Tags, the column 'Value' displays values of each local Tag.


3. Timers

3.1. Presentation Timers are used for counting a time, a delay.

• The maximum working time of 1 hour for a pump • The control of the time a modem is connected • The flashing of a lamp, using building a Flip-Flop with 2 timers • A delay before starting a motor • A delay before detecting an intrusion • …

Counters are used for counting pulses (see chapter 4). The mechanism of both functions is similar, the way they are used and the variable associated. The difference is that when a timer has been launched, it runs on its own until a defined preset of time when a counter increments every time it receives a pulse. Timers can be used either with BASIC of Ladder programming.

When created, Timers and Counters are available from the Resources in a folder: The List of Timers and the List of Counters

The way of using timer in Ladder is discussed chapter 3.5 and in BASIC chapter 3.6.


3.2. Introduction Four models of timers are available:

Single Shot: time cycle resets on each input activation. MonoStable: time cycle does not reset until it is over. Integral: time cycle with accumulation. Delay On: time cycle without accumulation.

Each model is presented with a diagram in chapters 3.8, 3.9, 3.10 and 3.11 In theory, the quantity of timers is not limited. Practically, it is limited to 32767 ! For each timer (regardless of type), there are two analog variables and one digital variable associated with it:

• Preset: analog variable with the Timer Preset. • Value: analog variable with the Timer Value. • Status: digital variable, i.e. the logical state of the Timer.

These three variables can be assigned as Tags and used in the BASIC or Ladder diagram (example: an automatic modification of a process at timed intervals). To see an example of using Timers, load the document 'MSTimer.tws' that you find in the sub-directory of TWinSoft 'Samples'.

3.3. Creating a Timer You create the Timers in the List of Timers, from the ‘Resources’ A Timer can also be created while being in Ladder edition but it is mandatory when programming in BASIC. From the ‘Resources’ and the list of Timers, click ‘Add a Timer’ To edit an existing Timer, you double-click it in the list.


3.4. The variables of a Timer Each Timer can be controlled using 3 variables:

• Preset: AIV in 32 bits DWord format (time in millisecond) • Value: AIV in 32 bits DWord format (time in millisecond) • Status: DIV as it indicates the timer is running or not.

Those variables are standard internal variables, with a free name. Once created in the list of Tags they can be associated to a timer. Probably status will need to be created, as it will be required to control the timer: timer still running or period elapsed. Preset and Value are optional and only required when they needs to be monitored from the process or from external software. For example the Timer Fan1, with 3 Tags associated:

Status of the Timer:

Value of the Timer:

Preset of the Timer:

Result in the list of Timers with when Tags are available, the current value:

1. Tags cannot be shared by several timers. 2. You don’t have to create a variable if you don’t need it. 3. Do not give the same name for ‘Timer’ and ‘Counter’ (see chapter 4)


3.5. Using Timers in Ladder To use a timer, you click the F/FB

button in the LD Toolbar and you select from the Folder ‘Timers’ the type of timer you need.

Once you have selected the type of timer, it appears in the Ladder line.

Example with a Timer Monostable (MS)

3.5.1. The instance name Any name, used as reference to the timer: - If it has been previously created in the ‘list of timers’ (see below): you select it. - If it does not exist: you type a name and TWinSoft prompts you to create it.

Example: Fan1

The Function ‘ResetTimer’ is used to reinitialize a timer, depending on the model (see next) or to clear it before it has reached its preset.


3.5.2. The Preset A constant to indicate the time in second. This constant is in floating point with decimal representing time smaller than 1 second

Examples: 0.50 = 500 msec. 7.50 = 7 sec. 500 msec. 900 = 15 minutes Dynamic Preset If you want to work with a dynamic preset, you will use a Tag (format DWord 32 bits) associated to the Preset (see chapter 3.4 here above). You still have to indicate a constant here, it will not be used but is mandatory when calling the function. A Timer function is inserted to a ladder line like following:

In Blue, its name (see instance name here above). Its Preset (see here above). EN Enable. It activates the timer function. ENO Enable Output : it is the image of EN. If EN is TRUE, ENO is TRUE. It

can be connected to a contact or a relay, a Mathematical block or another Function.

If you want to clear a timer, you select the Function 'Reset timer' associated to its name.

1. The preset minimum and the resolution is of 0.10 sec (100 msec.)

2. The character used to separate units from decimals depends on your regional settings, typically ‘ , ’ or ‘ . ’


3.6. Using Timers in BASIC

3.6.1. Reminder Four models of timer can be used in BASIC programs:

Single Shot: fixed time and restartable MonoStable: fixed time not restartable Integral: measuring of a period with accumulation On Delay: measuring of a period without accumulation

3.6.2. Syntax Single Shot: TimerSS (Name, Start, Preset) MonoStable: TimerMS (Name, Start, Preset) Integral: TimerIN (Name, Start, Preset) On delay: TimerOD (Name, Start, Preset) • Arguments Name : It is the name of the timer you have created (see chapter 3.3. here above)

Start : INPUT Bool.

The Tag or expression that activates the timer. Preset: INPUT. Constant giving the preset of the timer in sec. using a Floating register. Example: 10.5 (= 10 seconds and 500 msec.)

To access other variables of a Timer (Status and Value), or to work with dynamic Preset, you have to create Tags and associate them to the timer while creating it (see chapter 3.3. and 3.4. here above)

It is not possible to loop on timer arguments. Example: For i=4 TimerSS(name, start[i],Preset[i])


3.6.3. Reset Timer Function A dedicated reset function can be used to re-initialize the timer (depending on the type of Timer. Please refer to the diagrams chapters 3.8, 3.9, 3.10 and 3.11). • Syntax TimerReset (Name)

• Argument Name : It is the name of the timer you have created (see chapter 3.3. here above)

3.6.4. Examples How to manage time sequences using a Timer. Upon a given event, one needs to start the following sequence:

- 1 minute after event, execute Prog1 - 5 minutes after event, execute Prog2 - 10 minutes after event, execute Prog3

You create a Timer Monostable from the list of Timers. You name it for instance MyTimer. 'The variable ‘Event’ is a digital input of the RTU TimerMS(MyTimer,Event,1800) if TriggerPos(Time>=60) then call Prog1 if TriggerPos(Time>=300) then call Prog2 if TriggerPos(Time>=600) then call Prog3

Flip-Flop using 2 Timers Single Shot.

When you want to execute an operation alternatively on 2 equipments, you can easily create the alternation with 2 Timers: one starting the other. It is possible to adapt the frequency of the Flip-Flop by changing dynamically the value of Tags ‘Preset1’ and ‘Preset2’.

You create 2 Timers Single Shot with for each of them a Tag Status and a Tag Preset. You name the timers, for instance MyTimer1. and MyTimer2

'Flip-Flop using 2 Timer SS / 2.5 sec. ON and 2.5 sec. OFF

TimerSS (MyTimer1,not(Status2),2.5) TimerSS (MyTimer2,not(Status1),2.5)

3.7. Using Timers in POU’s Timers are used differently in the different POU’s: Program: you use Global Timers (the ones you declare in the folder ‘Timers’) Function: you cannot use Timer Function Block: you use Local Timers (you declare them in the list of local Tags of the

POU)


Coming in following chapter, the presentation of each model of Timer with its implementation in Ladder and a timing diagram.

3.8. Timer – Single Shot

Example of Ladder implementation

A rising edge on the Tag INPUT starts the timer for the PRESET time period (5sec.). The Tag STATE (which corresponds to the digital state of the timer) changes to 1 as soon as a rising edge of the Tag INPUT appears and changes to 0 when the PRESET time expires, or upon activation of a 'Reset Timer' Function associated with the timer. If a new rising edge of the Tag INPUT appears before the end of the Preset time the cycle is re-started


3.9. Timer – Monostable


A rising edge on Tag INPUT starts the timer for the PRESET time period (5sec.). The Tag STATE (which corresponds to the digital state of the timer) changes to 1 as soon as a rising edge of the Tag INPUT appears and changes to 0 when the PRESET time expires, or upon activation of the Timer Reset function associated with the timer. If a new rising edge appears before the end of the PRESET time, it has no effect on the cycle


3.10. Timer – Integral



The Tag INPUT must remain at 1 for the duration of the time defined in PRESET, so that the Tag STATE (which reflects the digital state of the timer) can change to 1. It remains active until the first rising edge of the Tag RESET (re-initialization the timer). If Tag INPUT falls to 0 before the end of the PRESET time, the value of the timer is retained (except if the rising edge of the Tag RESET appears and resets the timer). The re-activation of the Tag INPUT allows the timer continuing and completes the cycle.

The only way to reinitialize the timeris using the ‘Reset Timer’ Function


3.11. Timer – On Delay


If the Tag INPUT remains at 1 for the duration of time defined in PRESET, the Tag STATE (which reflects the digital state of the timer) changes to 1. This Tag returns to 0 as soon as INPUT changes to 0. If INPUT is deactivated before the end of the time cycle, the value of the timer is reset to 0. There is no accumulation.

The Tags of the timer are updated when the timer is scanned. It means that the precision depends on the cycle time of the process.


4. Counters

4.1. Presentation Counters are used for counting pulses Counters are used for asynchronous event counting. Timers are used for counting a time, a delay (see chapter 3)

• The maximum working time of 1 hour for a pump • The control of the time a modem is connected • The flashing of a lamp, using building a Flip-Flop with 2 timers • A delay before starting a motor • A delay before detecting an intrusion • …

The mechanism of both functions is similar, the way they are used and the variable associated too. The difference is that when a timer has been launched, it runs on its own until a preset when a counter increments every time it receives a pulse. Counters can be used either with BASIC of Ladder programming.

When created, Counters are available from the Resources in a folder in the List of Counters The way of using counter in Ladder is discussed chapter 4.5 and in BASIC chapter 4.6.


4.2. Introduction Three types of counters are available:

Counter UP: Counts up Counter DOWN: Counts down. RING counter: Circular counter (it restarts itself when the Preset is

reached. Each model is presented with a diagram in chapters 4.8, 4.9 and 4.10 In theory, the quantity of counters is not limited. Practically, it is limited to 32767 ! For each counter (regardless of type), there are two analog variables and one digital variable associated with it:

• Preset: analog variable with the Counter Preset • Value: analog variable with the Counter Value. • Status: digital variable, i.e. the logical state of the Counter.

These three variables can be assigned as Tags and used in the BASIC or Ladder diagram (example: an automatic process at intermediate values).

4.3. Creating a Counter You create a Counter from the ‘list of Counters’. A Counter can also be created while being in Ladder edition but it is mandatory when programming in BASIC. From the ‘Resources’ and the list of Counters, click ‘Add a Counter’ To edit an existing Counter, you double-click it in the list.


4.4. The variables of a Counter Each Counter can be controlled using 3 variables:

• Preset: AIV in 32 bits format (maximum number of pulses) • Value: AIV in 32 bits format (current quantity of pulses) • Status: DIV (it indicates the preset quantity of pulses has been reached).

Those variables are standard internal variables, with a free name. Once created in the list of Tags they can be associated to a counter. Probably Status will need to be created, as it will be required to control the counter: maximum number of pulses reached or not. Preset and Value are optional and only required when they needs to be monitored from the process or from external software. For example the Counter Pump1_hours, with 3 Tags associated:

Status of the Counter:

Value of the Counter:

Preset of the Counter:

Result in the list of Counters with when Tags are available, the current value:

1. Be sure you create different variables for each counter.TWinSoft will prompt you when you use a variable alreadyused by another counter.

2. It is not needed to create a variable if you don’t need it. 3. Do not give the same name for ‘Counter’ and ‘Timer’ (see

chapter 3)


4.5. Using Counters in Ladder To use a counter, you click the F/FB

button in the LD Toolbar and you select from the Folder ‘Counters’ the type of counter you need.

Once you have selected the type of counter, it appears in the Ladder line.

Example with a Counter UP

4.5.1. The contact used with the pulse input

4.5.2. The instance name Any name, used as reference to the counter: - If it has been previously created in the ‘list of counters’ (see below): you select it. - If it does not exist: you type a name and TWinSoft prompts you to create it.

Example: Pump1_Hours

The Function ‘ResetCount’ is used to reinitialize a counter, depending on the model (see next) or to clear it before it has reached the preset.

It must be a ‘Edge’ contact (positive or negative edge contact)


4.5.3. The Preset A constant to indicate the quantity of pulses to reach the end of counting. This constant is expressed in Dword format (max. 4,294,967,296) A Counter function is inserted to a ladder line like following:

In Blue, its name (see instance name here above). Its Preset (see here above). EN Enable. Each pulse increments the counter with 1. ENO Enable Output : it is the image of EN. If EN is TRUE, ENO is TRUE. It

can be connected to a contact or a relay, a Mathematical block or another Function.

If you want to clear a counter, you select the Function 'ResetCount' associated to its name.


4.6. Using Counters in BASIC

4.6.1. Reminder Three types of counters are available:

Counter UP: Counts up Counter DOWN: Counts down. RING counter: Circular counter (it restarts itself when the Preset is reached.

4.6.2. Syntax CountUP (Name, Start, Preset) CountDown (Name, Start, Preset) CountRing (Name, Start, Preset)

• Arguments Name : It is the name of the counter you have created (see chapter 4.3. here above)

Start : INPUT Bool. The Tag or expression that increments the counter. Preset: INPUT. Constant giving the preset in number of pulses.

4.6.3. Reset Counter Function A dedicated reset function can be used to re-initialize the counter (depending on the type of Counter. Please refer to the diagrams chapters 4.8, 4.9, 4.10) • Syntax CounterReset (Name)

• Arguments Name : It is the name of the counter you have created (see chapter 4.3. here above)

4.7. Using Counters in POU’s Counters are used differently in the different POU’s: Program: you use Global Counters (the ones you declare in the folder ‘Counters’) Function: you cannot use Counter Function Block: you use Local Counters (you declare them in the list of local Tags of the

POU)

The ‘start’ input must be associated to a Trigger function (TriggerPos or TriggerNeg)


Coming in following chapter, the presentation of each model of Counter with its implementation in Ladder and a timing diagram.

4.8. Counter - UP



Suppose that the Preset of the counter is 5. At each rising edge of the Tag PULSE, the value of the counter is incremented with 1, and when it reaches the value of the Preset, the Tag STATE (which represents the digital state of the counter) changes to 1. The count continues until the Tag RESET is triggered, which resets the value of the counter. At any given time, you can reset the counter with the help of the function CounterReset, activated in this example by the Tag RESET.

4.9. Counter - DOWN


You can pre-position the current value of the counter (using the Ladder diagram and the variable associated to the value) if you do not want the counting to start at zero, but at another value.


Suppose that the Preset of the counter is 3 and the variable associated to the value of the counter is initialized to 5 (Tag COUNT). The latter has priority on the preset defined in the Counter function. This operation can be done manually or by the Ladder diagram. In this example, it is the Tag INIT that initiates this operation. At each rising edge of the Tag PULSE, the value of the counter is decremented. The Tag STATE (which represents the digital state) remains at 1 as long as the current value is greater than the pre-selection. When the current value becomes less than the pre-selection, the Tag STATE changes to 0 and the counting continues to 0.


4.10. Counter - RING



Suppose that the Preset of the counter is 5. At each rising edge of the Tag PULSE, the value of the counter is incremented, and when this value reaches the one of the Preset, the Tag STATE (which represents the digital state) changes to 1. During the next rising edge of the Tag PULSE, the value is set to 0. A new counting cycle begins. At any given time, you can reset the counter with the help of the function ResetCount, activated in the example by the Tag RESET. If the Tag RESET is associated to a ‘normal contact’, the counter is blocked until release of the RESET (see notes below).

1. When working with counters, work with edges (positive or negative).

2. Do not drive more than once the same counter. If different input conditions are necessary to increase (decrease) a counter,use those on the same Ladder line, and if this is impossible, use atemporary digital variable to summarize all your conditions, thendeclare this variable, to drive the counter.



5. Library Manager TWinSoft offers the possibility to save POU Functions and POU Function Blocks in external files called ‘Libraries’ in order to use those POU in other TWinSoft documents. A library can contain several POUs. Function and Function Blocks from both BASIC and Ladder are concerned A library corresponds for instance to a customer or to a category of functions. A library is a file with the extension .LIB, saved by default in the directory of TWinSoft.

5.1. Import of POUs (saving POUs in a Library) To access the Import menu, click ‘Tools’ on the main menu bar and select ‘Library manager’

Only POU Functions and Function Blocks can be saved in a library.

1. You select an existing library (‘File’ -> ‘Open’), or you create a new library (‘File’ -> ‘New’).

2. You open the list of available POUs of the current document (‘Edit’ ->‘Import POU...’). 3. You select the POU you wish to save in the Library; you repeat operations 2 and 3 for

each POU. 4. You save the Library (‘File’ -> ‘Save’).

POU Program cannot be saved.


5.2. Export of POUs (retrieval of POUs from a library) To access the Export menu, click ‘Tools’ on the main menu bar and select ‘Library manager’ (see import of POUs here above) Export is necessary if you wish to edit a POU in the current document that has been saved in a Library. You open a library (‘File’ -> ‘Open’); the POUs appear in the top window. You select the POU and export it (‘Edit’ -> ‘Export’); you repeat this operation for each POU. The POUs are then available in the list of 'Programs', in the Project Workspace.

5.3. Use of a Library in a TWinSoft document

To access the 'Libraries' menu, click 'File' on the main menu bar and select 'Libraries...'

The ‘Available Libraries’ are the ones present in the directory of the current TWinSoft document or in the directory of TWinSoft. When a library appears in the list, all its POU Functions, and POU Function Blocks are available to be used in Ladder programming: in the list of Functions, the Libraries appear as Folders, each containing their own POUs. To add a Library to the current TWinSoft document, select it from the list of ‘Available Libraries’ and click ‘Add’. The button 'Manager' jumps to the creation of Library menu. To remove a Library from the current TWinSoft document, select the Library and click 'Remove'. This operation is available only if you don’t use POU of the concerned library in the current document.

Libraries can be protected by a password, so that it isimpossible to ‘Export’ it into a TWinSoft document, tosee the internal code.



Documents

(Chapter 1)tbox