Allen-Bradley PLC-5 - Page 306

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