Not Equal To (NE)

When enabled, the NE instruction and the operator not equal to symbol test whether Source A is not equal to Source B.
Available Languages
Ladder Diagram
NE ladder instruction
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
Affects Math Status Flags
No
Major/Minor 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 or Source B is NAN or Source A is not equal to Source B.
Set Rung-condition-out to true
else
Clear Rung-condition-out to false.
Postscan
N/A
Examples
Ladder Diagram
NE ladder instruction example
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