The automatic switchover to the redundant partner takes place not only when a server fails, but also in case of disturbed S7 process communication or faulty applications.Īdditional increase in system availability The clients connected to the servers are distributed among their original server partners again. Once this is complete, two equivalent servers/stations will be available again. When a failed partner is restored, all of the archived process values, messages (including statuses, acknowledgements, lists and comments), data from the user archive of the failure period and internal tags are automatically synchronized with the partner in the background – without affecting the running system. This ensures continuous plant visualization and operation on every operator station. In client/server mode, the clients are automatically switched from the failed server to the redundant partner. When one of the two WinCC stations fails, the other takes over the archiving of messages, process data and user data. The clients that are connected to the servers can be distributed to the servers as required, which leads to a reduced load. Normally, two WinCC stations or process data servers run completely in parallel, which means each station has its own process connection and own archives.
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