Allen-Bradley Logix5000 - Less than (LES); Relay Ladder; Structured Text

242 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 5 Compare Instructions (CMP, EQU, GEQ, GRT, LEQ, LES, LIM, MEQ, NEQ)
Less Than (LES)
The LES instruction tests whether Source A is less than Source B.
Operands:
Relay Ladder
· 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
for information on the syntax of expressions
within structured text.
Operand Type Format Description
Source A SINT
INT
DINT
REAL
string
Immediate Tag Value to test against Source B
Source B SINT
INT
DINT
REAL
string
Immediate Tag Value to test against Source A
IF sourceA < sourceB THEN
<statements>;