Loss of Communication between S7-400 PLC and WinCC

Connection was aborted:
- AS or CP disabled or reset.
-AS not connected to bus or error in bus system.
-Number of maximum permitted connections in AS exceeded.

Errorcode 0x0000 7002! means:
Lifebeat acknowledgement error.
The connection was terminated because the acknowledgment
of the lifebeat frame was not received within the expected period.

Here you can try to increase the values for the lifebeat monitoring
in the systemparameter of the channel (see screenshot).
But the networkconnection may be slow for any reason.

Regards

Georg Berghof