Lenze DDS v2.3 Manuel d'utilisateur télécharger pdf (Page 48)

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Drive PLC Developer Studio

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4-10

DDS EN 2.3

4.3.11 REPEAT loop

The REPEAT loop differs from the WHILE loop in that the cancel condition will only be checked after

the loop has been carried out. This means that the loop must be executed at least once no matter

what the cancel condition is.

Syntax:

REPEAT

UNTIL <Boolean expression>

END_REPEAT;

• The <instructions> are executed until <Boolean expression> returns TRUE.

• If <Boolean expression> returns TRUE on first evaluation already, the

<instructions> will be executed exactly once.

• If <Boolean_expression> is never TRUE, the <instructions> will be repeated

endlessly, forcing a runtime error.

Example:

REPEAT

Var1:=Var1*2;

Counter:=Counter-1;

UNTIL

Counter=0

END_REPEAT;

4.3.12 EXIT instruction

If the EXIT instruction is part of a FOR-, WHILE or REPEAT loop, the loop will be terminated

irrespective of the cancel condition.

In nested loops, EXIT terminates the innermost loop.

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Lenze DDS v2.3 Manuel d'utilisateur Page 48

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