Flag inputs and soft I/Os

[AbrarAhmad]

Dear All,
I have worked on s-7 400. I have worked on Maintenance of PLC in our winder machine used to wind the reels of paper machine.The problem is that I locate the fault without PG from the Hard copies of the logic but I cannot locate the flag inputs or the soft I/Os generated by Software.Kindly help me to troubleshoot soft I/Os.

 

[FrancisL]

You should be able to use the cross referencing facilities to trace all IO and 'flags'

 

[AbrarAhmad]

Dear FrancisL,
Cross Referencing means?

 

[FrancisL]

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