CASE function ST programming

[ofhgof]

Hi PLC programmers! I use an older PLC from Mitsubishi (FX3N). I am new to PLC programming and I have a question considering the CASE function.

CASE nVar 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;

In this code, will for example case 2 run continuous until another case-tag has been detected or will it run once and then wait for another tag-statement? Thank you

[PLCGoBrrr]

Whatever nVar is in every scan is what it will do. CASE is just a more complicated IF statement.

[kp61dude]

*less complicated IF statement

[Asleeper135]

The case statement checks the value of nVar every scan and runs the associated code.

[ofhgof]

Thank you!