Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 59)

L-force | PLC Designer
What is What in PLC Designer

DMS 3.2 EN 02/2011 TD29 57
A CASE instruction is processed according to the following model:
• If the variable in <Var1> has the value <Value i>, then the instruction <Instruction
i> is executed.
• If <Var 1> has none of the indicated values, then the <ELSE Instruction> is
executed.
• If the same instruction is to be executed for several values of the variables, then
one can write these values one after the other separated by commas, and thus
condition the common execution.
• If the same instruction is to be executed for a value range of a variable, one can
write the initial value and the end value separated by two dots one after the other.
So you can condition the common condition.
Example:
CASE INT1 OF
1, 5: BOOL1 := TRUE;
BOOL3 := FALSE;
2: BOOL2 := FALSE;
BOOL3 := TRUE;
10..20: BOOL1 := TRUE;
BOOL3:= TRUE;
ELSE
BOOL1 := NOT BOOL1;
BOOL2 := BOOL1 OR BOOL2;
END_CASE;
FOR loop
With the FOR loop one can program repeated processes.
Syntax:
INT_Var :INT;
FOR <INT_Var> := <INIT_VALUE> TO <END_VALUE> {BY <Step
size>} DO
<Instructions>
END_FOR;
The part in braces {} is optional.
The <Instructions> are executed as long as the counter <INT_Var> is not greater than
the <END_VALUE>. This is checked before executing the <Instructions> so that the
<instructions> are never executed if <INIT_VALUE> is greater than <END_VALUE>.