ST instruction 'CASE'

Use this dialog box for pooling several conditional instructions containing the same condition variable into a construct.

Syntax:

CASE <Var1> OF
<value1>:<instruction1>
<value2>:<instruction2>
<value3, value4, value5>:<instruction3>
<value6 ... value10>:<instruction4>
...
<value n>:<instruction n>

{ELSE <ELSE-instruction>}

END_CASE;

The section within the curly brackets ‎{}‎ is optional.

Processing scheme of a ‎CASE‎ instruction.

If the value of the variable ‎<Var1>‎ is ‎<value i>‎, then the instruction ‎<instruction i>‎ is executed.
If the variable ‎<Var1>‎ has non of the given values, then the ‎<ELSE-instruction>‎ is executed.
If the same instruction is executed for several values of the variable, then you can write the values in sequence, seperated by commas.

Example

CASE iVar OF 
1, 5: bVar1 := TRUE; 
      bVar3 := FALSE; 

2: bVar2 := FALSE; 
   bVar3 := TRUE; 

10..20: bVar1 := TRUE; 
        bVar3= TRUE; 
ELSE 
   bVar1 := NOT bVar1; 
   bVar2 := bVar1 OR bVar2; 
END_CASE;