Lenze PLC Designer PLC Designer (R2-x) Manuel d'utilisateur télécharger pdf (Page 58)

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101

L-force | PLC Designer

What is What in PLC Designer

56 DMS 3.2 EN 02/2011 TD29 

If the <Boolean_expression1> returns TRUE, then only the <IF_Instructions> are

executed and none of the other instructions.

Otherwise the Boolean expressions, beginning with <Boolean_expression2>, are

evaluated one after the other until one of the expressions returns TRUE. Then only

those instructions after this Boolean expression and before the next ELSE or ELSIF are

evaluated.

If none of the Boolean expressions produce TRUE, then only the <ELSE_instructions>

are evaluated.

Example:

IF temp<17

THEN heating_on := TRUE;

ELSE heating_on := FALSE;

END_IF;

Here the heating is turned on when the temperature sinks below 17 degrees.

Otherwise it remains off.

CASE instruction

With the CASE instructions one can combine several conditioned instructions with the

same condition variable in one construct.

Syntax:

CASE <Var1> OF

<Value3, Value4, Value5>: <Instruction 3>

...

ELSE <ELSE instruction>

END_CASE;

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Lenze PLC Designer PLC Designer (R2-x) Manuel d'utilisateur Page 58

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