Lenze PLC Designer PLC Designer (R2-x) Manual de usuario descargar pdf (Pagina 60)

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101

L-force | PLC Designer

What is What in PLC Designer

58 DMS 3.2 EN 02/2011 TD29 

When <Instructions> are executed, <INT_Var> is always increased by <Step size>. The

step size can have any integer value. If it is missing, then it is set to 1. The loop must

also end since <INT_Var> only becomes greater.

Example:

FOR Counter:=1 TO 5 BY 1 DO

Var1:=Var1*2;

END_FOR;

Erg:=Var1;

Let us assume that the default setting for Var1 is the value 1. Then it will have the

value 32 after the FOR loop.

 Note!

<END_VALUE> must not be equal to the limit value of the counter <INT_VAR>. For

example: If the variable Counter is of type SINT and if <END_VALUE> is 127, you will

get an endless loop.

WHILE loop

The WHILE loop can be used like the FOR loop with the difference that the break-off

condition can be any Boolean expression. This means you indicate a condition which,

when it is fulfilled, the loop will be executed.

Syntax:

WHILE <Boolean expression>

END_WHILE;

The <Instructions> are repeatedly executed as long as the <Boolean_expression>

returns TRUE. If the <Boolean_expression> is already FALSE at the first evaluation,

then the <Instructions> are never executed. If <Boolean_expression> never assumes

the value FALSE, then the <Instructions> are repeated endlessly which causes a

relative time delay.

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