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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Byte.Bit Addressing:
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the byte address, and the bit number.
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_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)
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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
