Less Than or Equal To (LE)
When enabled, the LE instruction and the operator 
tests whether Source A is less than or equal to Source B.
tests whether Source A is less than or equal to Source B.Available Languages
Ladder Diagram
Operands
There are data conversion rules for mixing numeric data types within an instruction. See Data conversions.
Ladder Diagram
Numeric Comparison
Operand | Data Type | Format | Description |
|---|---|---|---|
Source A | SINT INT DINT LINT USINT UINT UDINT ULINT REAL LREAL | immediate tag | Value to test against Source B |
Source B | SINT INT DINT LINT USINT UINT UDINT ULINT REAL LREAL | immediate tag | Value to test against Source A |
String Comparison
Operand | Data Type | Format | Description |
|---|---|---|---|
Source A | String type | immediate literal value tag | String to test against Source B |
Source B | String type | immediate literal value tag | String to test against Source A |
Affects Math Status Flags
No
Major/Minor Faults
See
LE String Compare Flow Chart
for faults.See Index through arrays for array-indexing faults.
Execution
Ladder Diagram
Condition/State | Action Taken |
|---|---|
Prescan | N/A |
Rung-condition-in is false | Set Rung-condition-out to Rung-condition-in |
Rung-condition-in is true | Numeric compare: If Source A and Source B are not NANs and Source A is less than or equal to Source B. Set Rung-condition-out to true else Clear Rung-condition-out to false. |
String compare: See LE String Compare Flow Chart .If output is false Clear Rung-condition-out to false else Set Rung-condition-out to true | |
Postscan | N/A |
LE String Compare Flow Chart
SourceA.LEN and SourceB.LEN are handled as unsigned values.
Example
Ladder Diagram
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