Equal To (Equ); Relay Ladder; Structured Text - Allen-Bradley Logix5000 Reference Manual

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

Equal To (EQU)

IF sourceA = sourceB THEN
<statements>;
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The EQU instruction tests whether Source A is equal to Source B.
Operands:

Relay Ladder

Operand
Source A
Source B
· If you enter a SINT or INT tag, the value converts to a DINT value by
sign-extension.
· REAL values are rarely absolutely equal. If you need to determine the
equality of two REAL values, use the LIM instruction.
· String data types are:
– default STRING data type.
– any new string data type that you create.
· To test the characters of a string, enter a string tag for both Source A and
Source B.

Structured Text

Use the equal sign '=' as an operator within an expression. This expression
evaluates whether sourceA is equal to sourceB.
See Structured Text Programming
within structured text.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Type Format
SINT Immediate Tag
INT
DINT
REAL
string
SINT Immediate Tag
INT
DINT
REAL
string
for information on the syntax of expressions
Description
Value to test against
Source B
Value to test against
Source A