Relay Ladder; Structured Text; Function Block - Allen-Bradley Logix5000 Reference Manual

Chapter 5 Compare Instructions (CMP, EQU, GEQ, GRT, LEQ, LES, LIM, MEQ, NEQ)
value_1 0 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1
mask_1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1
masked v alue_1 x x x x
256
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).
x x x x x x x x 1 1 1 1

Relay Ladder

Structured Text

light_1 := ((value_1 AND mask_1)=(value_2 AND mask_2));

Function Block

Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
value_2 0 1 0 1 0 1 0 1 1 1 1 1 0 0 0 0
mask_1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1
masked v alue_2 x x x x x x x x x x x x 0 0 0 0