How does the alive mechanism for manager connections work in WinCC OA?

WinCC OA is using TCP/IP for the manager connections. In every manager an own alive thread is implemented to send alive messages to the Data- and Event-Manager and to receive alive messages. The alive messages are send via TCP.

The alive timeout is configured with the config entry aliveTimeout. The default value is -10 seconds. A negative value defines that alive message are not send to processes running on the same host.
The interval for sending the alive messages is aliveTimeout divided by 10.

If no alive-message is received within the timeout the connection is disconnected. If the connection is lost due to missing alive-messages a log message is written to the PVSS_II.log file.

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Tags:
Distributed Systems, WinCC Open Architecture
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