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Thread: CEL doesn't record events when loss of connection to RTU

  1. #1
    Join Date
    04.06.2015
    Posts
    6

    Default CEL doesn't record events when loss of connection to RTU

    Hello,

    I've had some problems with getting events from an RTU when the RTU loses connection. The connected RTU stores the change of events when it looses connection to it's OPC gateway, zenon connects to the OPC gateway as an OPC DA client and reads the status of a point as per the screenshot attached. if I unplug the RTU's ethernet port, the RTU stores the changes of status of the IO and uppon to recconection to the gateway it "discharges" it's event log while it lost connection to the OPC gateway. I've noticed that Zenon ignores all the changes that were done while disconnected as per the attached screenshot. Is there any speacial setting that needs to be done to deal with this?
    Attached Thumbnails Attached Thumbnails Zenon events.jpg  

  2. #2

    Default Re: CEL doesn't record events when loss of connection to RTU

    Hi cosminbutanescu,

    The zenon OPC DA client driver communicates asynchronously, which means that it would be capable of receiving events (OnDataChange) Callbacks from the OPC DA server when these are performed. Could it be that your gateway / OPC DA Server, is polling the RTU and hence misses the events?

    What kind of communication protocol is used between the OPC DA server and the RTU?

    zenon supports a very large amount of communication protocols. It may be, that there is a native communication driver that would support these events and allows for direct communication without the OPC gateway.

    Best regards,
    Mark

  3. #3
    Join Date
    04.06.2015
    Posts
    6

    Default Re: CEL doesn't record events when loss of connection to RTU

    Hi Mark, 
    Thank you for your fast reply, the RTU in test is Fastflex RTU from Siemens, and it's native communication protocol is bespoke(Fastflex communication protocol) so the OPC Gateway that comes together with Fastflex is converting from it's native protocol to OPC DA V1.0. The gateway retieves the historic data(which happened during RTU loosing comms) as in the picture attached, when the node is red is data which was stored in the eventlog and released as soon as reconnection. I also noticed Zenon not retrieven this sort data for OPC UA comunication too.
    Coming back to Fastflex RTU I would have expected a "node status" for the OPC Tags, as you see in the attached picture the Tag goes into QUALITY BAD as soon as it looses comms.

  4. #4

    Default Re: CEL doesn't record events when loss of connection to RTU

    Hi cosminbutanescu,

    Thanks for the details provided. It may very well be that the OPC DA client driver in zenon receives the bad status. Based on the screenshot of the event list, this cannot be determined. There will not be an entry in the CEL automatically when a bad status is received. This would happen e.g. through a reaction matrix that monitors the INVALID status bit and creates a corresponding entry in the CEL.

    I would suggest contacting your local COPA-DATA support to get further assistance and look at logfiles of the diagnosis server to see what values or status changes are in fact provided by the OPC DA server.

    Best regards,
    Mark

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