The IEC operator is used for the "does not equal" function.

Permitted data types of the operands: any basic data type; dependent on target system and compiler versions: structure data type

If the operands are not equal, then the operator yields the result ‎TRUE‎; otherwise ‎FALSE‎.

If the target system supports the data type, then with compiler version >= 3.5.7.0 and higher the STRUCT (structure) type operands can also be compared. Example: ‎IF (stStruct1 := stStruct2) THEN...‎.

Examples

Result in ‎Var1‎: ‎FALSE‎

ST

Var1 := 40 <> 40;

FBD