Allen-Bradley PLC-5 User Manual page 306

D-6 Instruction Set Quick Reference
Instruction
CMP
COMPARE
Expression
N7:5 = N7:10
xxx
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Source A
Source B
Publication 1785-UM012D-EN-P - July 2005
Compare
CMP
Source A
10
N7:5
5
3
N7:10
21
1
-30
-15
Equal to
EQU
Greater than or Equal
GEQ
Greater than
GRT
Less than or Equal
LEQ
Less than
LES
Not Equal
NEQ
Description
If the expression is true, this input instruction is true. The CMP
instruction can perform these operations: equal (=), less than
(<), less than or equal (<=), greater than (>), greater than or
equal (>=), not equal (<>), and complex expressions (up to 80
characters).
Source B EQU
GEQ
10 T T
6 F F
20 F T
-31 F T
-14 F F
If the value in Source A (N7:5) is = to the value in Source B
(N7:10), this instruction is true.
If the value in Source A (N7:5) is > or = the value in Source B
(N7:10), this instruction is true.
If the value in Source A (N7:5) is > the value in Source B
(N7:10), this instruction is true.
If the value in Source A (N7:5) is < or = the value in Source B
(N7:10), this instruction is true.
If the value in Source A (N7:5) is < the value in Source B
(N7:10), this instruction is true.
If the value in Source A (N7:5) is not equal to the value in
Source B (N7:10), this instruction is true.
GRT LEQ LES NEQ
F T F F
F T T T
T F F T
T F F T
F T T T