Lenze PLC Designer PLC Designer (R2-x) Uživatelský manuál stáhnout pdf (Strana 476)

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IEC Operators and additional norm extending functions

474 DMS 3.2 EN 02/2011 TD29 

9.5 Selection Operators

All selection operations can also be performed with variables. For purposes of clarity

we will limit our examples to the following which use constants as operators.

PLC Designer IEC operator: Binary Selection.

OUT := SEL(G, IN0, IN1) means:

OUT := IN0 if G=FALSE;

OUT := IN1 if G=TRUE.

IN0, IN1 and OUT can be any type of variable, G must be BOOL. The result of the

selection is IN0 if G is FALSE, IN1 if G is TRUE.

Example in IL:

SEL 3,4 (* IN0 = 3, IN1 =4 *)

ST Var1 (* Result is 4 *)

ST Var1 (* Result is 3 *)

Example in ST:

Var1:=SEL(TRUE,3,4); (* Result is 4 *)

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Lenze PLC Designer PLC Designer (R2-x) Uživatelský manuál Strana 476