Dear forum user,

Maybe Step7 also have something like as TIA Portal  trace feature for diagnostic (as attached)

I have lot inputs for one stop and can't found which signal works unstable

PLC:  S7-300 programmed by Step7

For STEP 7, we use logic analyzers for diagnostics purposes. They provide cycle-precise data acquisition. For ordinary process diagnostics , SIMATIC WinCC also provide tag-logging  and process messages.

https://www.autem.de/products/plc-analyzer-pro-6/

https://www.iba-ag.com/en/ibaanalyzer

For PCS 7 V8 onwards , there is a possibility to have a functionality similar to trace in CFC . It is used for  data gathering  in advanced process control modeling.

Kind regards,

hdhosseini

In my work, we have a special FB called "First Out" that monitors a given set of digital / analog values.  The very first one that deviates from what's required for automatic operation latches a bit.

If any of those bits turn true, a single "First Out Fault" turns on which stops automatic operation.

With an FB to handle the bools, and another FB to handle the analogs, you can set one up very quickly (minutes).  Download to the PLC, and the next time one of those many inputs causes a stop, you know which was the very first one to cause that particular stop.

If you get smart, you can use a retained DB filled with counts for each FirstOut Fault source, INCrementing for each faulting event for a given input.

(First Out - First signal to go Out of required range/value for automatic operation)

And of course, do not forget to provide a RESET input to the First Out FB so it can clear the latched faults.  Note that sometimes it requires 2 cycles of the reset signal to clear faults on some systems where clearing all faults simply enables resetting faults on something else - like drive fault acknowledge might need control power back first, but you cannot necessarily get control power back with a drive fault - unless your VFDs controllers (but, not 3 phase motor modules) are powered all the time.

I think you will find once you build such a thing, you will find it so useful, you will wonder how you didn't do it sooner.

RamunasR

Hello,

Maybe Step7 also have something like as TIA Portal  trace feature for diagnostic (as attached)

I have lot inputs for one stop and can't found which signal works unstable

 PLC:  S7-300 programmed by Step7

Did you solve your problem(s)?  If so, how?

RamunasR

Hello

Thank You for advice