Lenze DDS v2.3 Manual de usuario descargar pdf (Pagina 278)

100

101

Drive PLC Developer Studio

IEC 61131-3 Operators

12-8

DDS EN 2.3

12.4 Selection operators

All selection operations can also be carried out on variables.

For better understanding, the examples below use constants as operands.

12.4.1 SEL

Binary selection

OUT := SEL(G, IN0, IN1)

means:

IF G THEN

OUT:=IN1;

ELSE

OUT:=IN0;

END_IF

IN0, IN1 and OUT canbeofanytype,G must be of type BOOL.

The result of the selection is

• IN0 if G is FALSE,

• IN1 if G is TRUE.

Examples

IL ST FBD

LD TRUE

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

ST Var1 (*Result=4 *)

LD FALSE

SEL 3,4

ST Var1 (*Result=3*)

Var1:=SEL(TRUE,3,4);

(*Result Var1=4*)

Tip!

Processing is as follows for runtime optimization.

An expression attached to the input side of IN0 will be computed only if G = FALSE.

An expression attached to the input side of IN1 will be computed only if G = TRUE.

Simulation will compute all branches.

12.4.2 MAX

Maximum function

Returns the greater of two values.

OUT := MAX(IN0, IN1)

IN0, IN1 and OUT canbeofanytype.

Examples

IL ST FBD

LD 90

MAX 30

MAX 40

MAX 77

ST Var1 (* Var1 = 90 *)

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