Upload
phamkien
View
214
Download
0
Embed Size (px)
Citation preview
An educational software project in the field of process control
Michael RitzschkeInstitute of InformaticsHumboldt University
Berlin
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 20082
Motivation and goals of the projectConfiguration of the programmable logic controller (PLC) SIMATICSteps to develop a PLC programOutlook: Automatically generate a PLC program
Contents
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 20083
Process control with programmable logic controler (PLC)
PLC: digital computer used for automation of industrial processes (SIMATIC S7-200 … -400, SIMATIC S5)
For instance control of machinery on factory assembly lines
PLC are special PC‘s for using in severe conditions (dust, moisture, heat, cold, etc)
PLC have the facility for extensive input/output arrangements, connecting the PLC to sensors and actuators with different modules
http://en.wikipedia.org/wiki/Assembly_line
http://www.automation.siemens.com
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 20084
Process control with PLC –an industrial example
Fully automatic pallet storage system
http://www.insystems.de
5
Process control of a production modelin our CAM_Lab at Humboldt University
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
6
The production model
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
High-bay storage
Supply parts storage (gibs)
MachinesAssambly robot
Conveyors androtary tables
7
Goals of the project – what our students can learn
Architecture of PLC and their configuration Why PLC is used in process controlDevelop different models from a production process (state machines, Petri Net etc)Write a control programTest the program with a simulation toolTest the program with our production model Find mistakes and eliminate theseWork with different development tools
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 20088
Motivation and goals of the projectConfiguration of the programmable logic controller (PLC) SIMATICSteps to develop a PLC programOutlook: Automatically generate a PLC program
Contents
9
Hardware configuration of the PLC SIMATIC
Basis: Numbers and types of the sensorsignalsand the actuatorsignals
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
84 Input-Signals50 Switches, 28 Metal detectors, 1 photoelectric barrier
binary signal1 Potentiometer analogue signal4 incremental position encoder
digital signal
88 Output-Signals84 Motors, 4 Magnets binary signal
11
Today: STEP 7-Lite(via internet freely available Software /1/)
Easy configure the hardware with drag&drop
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
12
S135U: Our configuration
3 CPU’s1 Coordination4 Digit input4 Digit output1 Analogue input2 Special modules with own CPU (Incrementer)2 Electricity supply
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 200813
Contents
Motivation, goals of the projectConfiguration of the PLC SIMATICSteps to develop a PLC program
Develop models of the ProcessWrite the programTest the program with simulation PLCTest the program in practice
Outlook: Automatically generate a PLC program
14
Factory door – a teaching example
Static model: Layout of a factory door
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
2 sensors (opened / closed)actuator: electrical motor2 key switches, 1 telekeyFlashing light (door moves)Broken photoelectric key door opensDoor closes after 20 sec
15
Signal-Table
Signal I/O Kennz Logische ZuordnungSchlüsselschalter außen E 1.0 S1 Betätigt S1=1
Schlüsselschalter innen E 1.1 S2 Betätigt S2=1
Funkempfänger E 1.2 S3 Code empfangen S3=1
Endschalter Tor zu E 1.3 S4 Tor zu S4=1
Endschalter Tor auf E 1.4 S5 Tor auf S5=1
Lichtschranke E 1.5 L1 Unterbrochen L1=0 (!) Öffner
Blinklicht A 1.0 H1 Licht an H1=1
Motorschütz Tor auf A 1.1 K1 Schütz angezogen K1=1
Motorschütz Tor zu A 1.2 K2 Schütz angezogen K2=1
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
16
Static model: Finite state machine
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
17
Dynamic model: Petri Net
Software /2/:Visual Object Net
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
19
Editing the program (IEC 61131-3: Function block diagram and statement list)
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
Software /3/:S5/S7 for Windows
20
Simulation and test the program with simulation PLC /3/
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
21
Student project: Development of a PLC program for a part of the production model
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
22
Example: Cycle transport pallets with conveyors
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
Static model: Layout
The program as a paper (statement list) and …
23M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 200825
Motivation, goals of the projectConfiguration of the programmable logic controller (PLC) SIMATICSteps to develop a PLC programOutlook: Automatically generate a PLC program
Contents
26M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
Model: Signal interpreted Petri Net (SIPN)
Control system
ProcessAE E : sensor signalsA : control signals
E5.3 = 1E5.4 = 0 A4.4 = 1
A4.2 = 0A4.3 = 0
SIPN = Petri Net + inputsignals + outputsignals
28
Output signals: 2 motors workparallel
Firing condition: pallet on conveyor9, conveyor 10 free
M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
SIPN for control of 3 conveyors /4/
Firing condition: pallet on conveyor 10
30M.Ritzschke, DAAD Workshop Durres, September, 8th - 13th, 2008
References/1/ STEP 7-Lite. Siemens AG, http://support.automation.siemens.com/2/ Drath, R., Visual Object Net++, Technical University Ilmenau /3/ S5/S7 for Windows. IBHsoftec GmbH,
http://www.ibhsoftec-sps.de/english/Selection_S5_S7.htm/4/ SIPN-Editor: University Kaiserslautern,
http://www.eit.uni-kl.de/frey/Downloads/SIPN/SIPNEditor.htm
Summary and references