usedplcs
Member
Today I connected a new KT600 to a Siemens 317F safety PLC to display some basic information.
This all worked fine and was connected via Profibus.
Some time later I was called as the equipment was not in its ready state.
After some diagnostics:
There were inputs I57.0 etc showing true/green 24VDC on the input card.
Viewing the logic in the program I57.0 showed false.
In VAT table it mainly showed True and then occasionally flashed false.
No CPU diagnostics.
Reset the PLC and all returned to its normal operating state.
Why or what could possibly cause these this discrepancy between Input Card / Logic and VAT table.
Many Thanks for any suggestions
This all worked fine and was connected via Profibus.
Some time later I was called as the equipment was not in its ready state.
After some diagnostics:
There were inputs I57.0 etc showing true/green 24VDC on the input card.
Viewing the logic in the program I57.0 showed false.
In VAT table it mainly showed True and then occasionally flashed false.
No CPU diagnostics.
Reset the PLC and all returned to its normal operating state.
Why or what could possibly cause these this discrepancy between Input Card / Logic and VAT table.
Many Thanks for any suggestions