Compare instructions Chapter 10
Rockwell Automation Publication 2080-RM001D-EN-E - February 2015 265
For Integer, Real, Time, Date, and String values, Less Than or Equal compares
input values to determine whether the first is less than or equal to the second.
Special recommendations
For TON, TP, and TOF, equality testing of Time values is not recommended.
Arguments
Parameter Parameter Type Data Type Description
EN Input BOOL Function enable.
When Enable = TRUE, execute the input comparison.
When Enable = FALSE, there is no comparison.
Applies only to LD programs.
i1 Input SINT - USINT - BYTE - INT - UINT -
WORD - DINT - UDINT - DWORD -
LINT - ULINT - LWORD - REAL - LREAL
- TIME - DATE - STRING
All inputs must be the same data type. The Time input
applies to the ST, LD and FBD languages.
i2 Input SINT - USINT - BYTE - INT - UINT -
WORD - DINT - UDINT - DWORD -
LINT - ULINT - LWORD - REAL - LREAL
- TIME - DATE - STRING
o1 Output BOOL TRUE if i1 <= i2.
Less than or equal (<=) operator ST language example
(* ST Equivalence: *)
aresult := (10 <= 25); (* aresult is TRUE *)
mresult := ('ab' <= 'ab'); (* mresult is TRUE *
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