Allen-Bradley Logix5000

252 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 5 Compare Instructions (CMP, EQU, GEQ, GRT, LEQ, LES, LIM, MEQ, NEQ)
Mask Equal To (MEQ)
The MEQ instruction passes the Source and Compare values through a Mask and
compares the results.
Operands:
Relay Ladder
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 Type Format Description
Source SINT
INT
DINT
Immediate Tag Value to test against Compare
A SINT or INT tag converts to a DINT value by zero-fill.
Mask SINT
INT
DINT
Immediate Tag Defines which bits to block or pass
A SINT or INT tag converts to a DINT value by zero-fill.
Compare SINT
INT
DINT
Immediate Tag Value to test against Source
A SINT or INT tag converts to a DINT value by zero-fill.
Operand Type Format Description
MEQ tag FBD_MASK_EQUAL Structure MEQ structure