When PI tags have value as out of serv, what does that mean. What to do to make it correct?
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If a PI tag is reading “Out of Serv”, that generally implies that the OPC Interface is not receiving data or receiving bad quality data. “Out of Serv” is a digital state from the PI Server that is translated from the OPC Server. It could be that the tag is reading a bad quality value.
As Rob mentioned, it is due to no update received from OPC server. If you are using OPC DA request you to use OPC DA client and check if tag has good/bad value on OPC server.
I know this Question may be old news, but I'm not sure if a corrective action was adequately provided.
I was getting this 'Out of Serv' on one of my data points (and again on other points later) after I had upgraded the firmware of the controller and subsequently the version of the program. I did use the PI OPC Client Tool on the interface server to verify what Robert and Lal Babu were saying. It indicated it was receiving bad quality data. To resolve the issue, I stopped the RSLinx Classic Service, and opened the RSLinx Classic Application. I drilled down into the list of topics to verify RSLinx was registering the PLC as having the new firmware by checking the Device Properties. I restarted RSLinx Classic Service, and verified PI was once again successfully collecting data on that PI Point (and the others after restarting RSLinx Classic Service following each PLC firmware update).
I hope this corrective action will help you resolve your issue the next time you see 'Out of Serv' on your data point!
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