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Server state changed unexpectedly
August 5, 2016
14:37, EEST
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Izak
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Hello,
We are using Prosys and as OPC server Kepware is used. Quite frequently, at some occassions every hour we get a notification that the “server state” has been changed.
Example:
2016-08-03 05:04:16.635 WARN Server state changed unexpectedly from “Running” to “CommunicationFault” in connection state “CONNECTED”.
2016-08-03 05:04:17.802 WARN Server state changed unexpectedly from “CommunicationFault” to “Running” in connection state “CONNECTED”.
Normally it switches from Running -> CommunicationFault -> Running again within some second.
We have been trying to see why this happens from the OPC server log file but cannot connect any events there that can explain the “server state change” that Prosys is refering to.
Do you have some ideas what can trigger this server state change?

BR Andreas

August 5, 2016
15:40, EEST
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Heikki Tahvanainen
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Hi,

The server state monitoring in the SDK is done by reading value attribute from the ServerStatus node. The ServerStatus node is a standard node which can be found by browsing Objects->Server->ServerStatus (NodeId i=2256).

As a first step, you can try setting different values to status check interval and status check timeout.

By default, the SDK does the server status checking once every second. The interval can be changed with UaClient.setStatusCheckInterval method.

The default timeout for these status checks is 10 seconds which should be long enough for all normal situations. The statusCheckTimeout can be changed with method UaClient.setStatusCheckTimeout.

Hopefully this helps to solve your issue. If not, let us know.

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