Less Than (Les); Relay Ladder; Structured Text - Allen-Bradley Logix5000 Reference Manual

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

Less Than (LES)

IF sourceA < sourceB THEN
<statements>;
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The LES instruction tests whether Source A is less than 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.
· 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 less than sign '<' as an operator within an expression. This expression
evaluates whether sourceA is less than 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