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PLC INFORMATION GGGG

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theoretical consideration the fourth fundamental quantity could be taken as charge which hasthe fundamental unit couloumb. It is possible to derive current from charge and vice versa.However, the reason for selection of current rather than charge as the fundamental quantity isthat ampere serves as the link between electrical, magnetic and mechanical quantities and ismore readly measured.Even though it is possible to function with the seven fundamental units mentioned above,yet if a set of derived units are defined with special names, the resulting equations andcalculations are greatly simplified Table i.1 lists the Derived units in S.I.

Text of PLC INFORMATION GGGG

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EMBED Word.Document.8 \s

Byte.Bit Addressing:

To access a bit in a memory area, you specify the address, which includes the memory area identifier,

the byte address, and the bit number.

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EMBED Word.Document.8 \s

_1217323632.docDecimal and Hexadecimal Ranges for the Different Sizes of Data

Representation

Byte (B)

Word (W)

Double Word (D)

Unsigned Integer

0 to 255

0 to FF

0 to 65,535

0 to FFFF

0 to 4,294,967,295

0 to FFFFFFFF

Signed Integer

-128 to +127

80 to 7F

-32,768 to +32,767

8000 to 7FFF

-2,147,483,648 to +2,147,483,647

8000 0000 to 7FFFFFFF

Real IEEE 32bit Floating Point

Not applicable

Not applicable

+1.175495E-38 to +3.402823E+38 (positive)

-1.175495E-38 to -3.402823E+38 (negative)

_1217323708.doc

I

3

4

..

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Memory Area Identifier

Memory area identifier

Byte address: byte 3 (the fourth byte)

Period separates the byte address from the bit number

Bit of byte, or bit number: bit 4 of 8 (0 to 7)

7

6

5

4

3

2

1

0

Byte 0

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

Processimage Input (I) Memory Area