Scada HMI Objects keep getting cross and back normal
I have an issue on two of my RTUs in my SCADA network. The device pings are normal as shown in both attached snapshot. But it gets crosses after sometime like 1 min and no device gets value and then gets back normal. and It keeps happening and so its very difficult to operate both RTUs.
Could the controller Logic be removed after sometime due to this? and how can this error be averted?
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> I have two stations and both showing this error and also it appears on my connectivity server in engineering workplace
Note that downloading code changes to the controller will cause the OPC server to disconnect momentarily and this will cause the graphics to behave as described. This is expected behaviour.
Connect a third party test client on the connectivity server directly to the AC800M OPC server and check for bad quality connections.
Open any Function Block or Control Module aspect in the client workplace on the connectivity server and subscribe for values in that function block.
Monitor these clients while you also check the operator graphics for red crosses.
Are there any other error messages appearing in your windows logs ? Event messages in the Services Event list ? When did the OPC DA Collector services last start ?
Are there any log files in the OPC Server Log Files Directory ?
The OPC Conneciton Status is going "bad" or "uncertain".
No, OPC connection errors cannot cause you lose the "Controller Logic". However, loosing the controller program would cause all of your Workplaces to show errors. It should be pretty obvious if the the controller restarted.
If one station works while the other does not, then the stations are losing connection with the OPC server, not the PLC. Troubleshoot that.
Uncertain cannot be set by system, only OPC server.
If AC 800M check load (total < 90, cyclic < 65).
Too rapid MMS communication can make the OPC server "starve". Check MMS rates in OPC Server Panel and CBM->Remote System->Show MMS Communication
Poor TCP/IP network can cause losses among large MMS while small ping make it through.