256 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 5 Compare Instructions (CMP, EQU, GEQ, GRT, LEQ, LES, LIM, MEQ, NEQ)
Example 2: If the masked value_1 is equal to the masked value_2, set light_1. If the masked
value_1 is not equal to the masked value_2, clear light_1. This example shows
that the masked values are not equal. A 0 in the mask restrains the instruction
from comparing that bit (shown by x in the example).
Relay Ladder
Structured Text
light_1 := ((value_1 AND mask_1)=(value_2 AND mask_2));
Function Block
value_10101010111111111 value_20101010111110000
mask_10000000000001111 mask_10000000000001111
masked value_1xxxxxxxxxxxx1111 masked value_2xxxxxxxxxxxx0000
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