Mask Equal To (Meq); Relay Ladder; Structured Text; Function Block - Allen-Bradley Logix5000 Reference Manual

Chapter 5 Compare Instructions (CMP, EQU, GEQ, GRT, LEQ, LES, LIM, MEQ, NEQ)

Mask Equal To (MEQ)

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The MEQ instruction passes the Source and Compare values through a Mask and
compares the results.
Operands:

Relay Ladder

Operand
Source
Mask
Compare

Structured Text

Structured text does not have an MEQ instruction, but you can achieve the same
results by using structured text.
IF (Source AND Mask) = (Compare AND Mask) THEN
<statement>;
END_IF;

Function Block

Operand
MEQ tag
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Type Format
SINT Immediate Tag
INT
DINT
A SINT or INT tag converts to a DINT value by zero-fill.
SINT Immediate Tag
INT
DINT
A SINT or INT tag converts to a DINT value by zero-fill.
SINT Immediate Tag
INT
DINT
A SINT or INT tag converts to a DINT value by zero-fill.
Type
FBD_MASK_EQUAL
Description
Value to test against Compare
Defines which bits to block or pass
Value to test against Source
Format Description
Structure MEQ structure