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L-force | PLC Designer

IEC Operators and additional norm extending functions

 DMS 3.2 EN 02/2011 TD29 481

PLC Designer IEC operator: Equal to

A Boolean operator that returns the value TRUE when the operands are equal. The

operands can be BOOL, BYTE, WORD, DWORD, SINT, USINT, INT, UINT, DINT, UDINT,

REAL, LREAL, TIME, DATE, TIME_OF_DAY, DATE_AND_TIME and STRING.

Example in IL:

ST Var1 (* Result is TRUE *)

Example in ST:

VAR1 := 40 = 40;

Example in FBD:

PLC Designer IEC operator: Not equal to

A Boolean operator that returns that value TRUE when the operands are not equal.

The operands can be BOOL, BYTE, WORD, DWORD, SINT, USINT, INT, UINT, DINT,

UDINT, REAL, LREAL, TIME, DATE, TIME_OF_DAY, DATE_AND_TIME and STRING.

Example in IL:

ST Var1 (* Result is FALSE *)

Example in ST:

VAR1 := 40 <> 40;

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Lenze PLC Designer PLC Designer (R2-x) Manual do Utilizador Página 483