Hi all,
I have a strange problem with a WinCC version 7.4 project. If alarms from the alarm list are used, the connection between WinCC and PLC is lost within 0-60 seconds. This only happens with a real PLC (S7-317-2-DP) and the PC with WinCC, not while testing with a SIM PLC (WinLC RTX) and the same PC with WinCC.
As far as I know it's a standard alarm setup, reading bits from an alarm words in a DB in the PLC.
The PLC also communicates with another PLC using an S7 connection and BSEND/BRCV blocks, sending a 200 byte DB and receiving a 200 byte DB.
The CP card diagnostics don's show anything strange.
What could it be?
I have a strange problem with a WinCC version 7.4 project. If alarms from the alarm list are used, the connection between WinCC and PLC is lost within 0-60 seconds. This only happens with a real PLC (S7-317-2-DP) and the PC with WinCC, not while testing with a SIM PLC (WinLC RTX) and the same PC with WinCC.
As far as I know it's a standard alarm setup, reading bits from an alarm words in a DB in the PLC.
The PLC also communicates with another PLC using an S7 connection and BSEND/BRCV blocks, sending a 200 byte DB and receiving a 200 byte DB.
The CP card diagnostics don's show anything strange.
What could it be?