Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 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.
9.5.1 SEL
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:
LD TRUE
SEL 3,4 (* IN0 = 3, IN1 =4 *)
ST Var1 (* Result is 4 *)
LD FALSE
SEL 3,4
ST Var1 (* Result is 3 *)
Example in ST:
Var1:=SEL(TRUE,3,4); (* Result is 4 *)