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Hi,

Is it possible to debug blocks written in STL/FBD/LAD in Siemens SIMATIC S7 PLCs? If yes, how?

And if no, why do we have the debug toolbar in STL/FBD/LAD editor?

Best regards,
k.zonouzi ahmad

Hi,

I have found that in STL it is possible, through going online and using the debugging functions, but not in FBD/LAT. If I am right but there are more possibilities, please let me know. I just wanted to share what I have found.

Best regards,
k.zonouzi ahmad

Hi,

You are right my friend. Only in STL, SCl and above languages step by step debugging is possible, for ladder and FBD the same is not required since the output is directly visible either through VAT of DB, etc. Since normally ladder and FBD will not contain complicated loops (it's not a must) processing data the same doesn't require any hifi debugger. SCL provides a direct debugger and we don't have to change the operation mode of the PLC either. Any thing else you wanna know???

Hello dear friend,

Thank you for your confirmation. And no thank you, there is not more at the moment to ask you.

Best regards,
k.zonouzi ahmad