set and reset operators in structured text

otrotabi · ‎2022-08-04

what is the right way to use S (SET) and R (Reset) in HAVC ecostruxure machine expert ?

bool1 S= bool2 ; does not work, it gives syntax error.

Bastian_Schmitz · ‎2022-08-04

Hi, for my understandig S and R are more related to graphical languages like FBD and LD.

I think if you want do the same in ST you could use an IF THEN ELSE combination.

I could not find a sample in the online help or a way to use it in ST.

But if you use the SR/RS FB it should work.

See Answer In Context

Bastian_Schmitz · ‎2022-08-04

Hi, for my understandig S and R are more related to graphical languages like FBD and LD.

I think if you want do the same in ST you could use an IF THEN ELSE combination.

I could not find a sample in the online help or a way to use it in ST.

But if you use the SR/RS FB it should work.

otrotabi · ‎2022-08-04

Ok. I thought this was part of the IEC 61131 standard, but now I see that in codesys it seems to be part of the extended standard (whatever that is it looks like not the standard implementation).

https://help.codesys.com/webapp/_cds_exst_operator_r;product=codesys;version=3.5.14.0

Thanks for your fast answer.