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Thread: GI in IEC 60870-5-104

  1. #1
    Join Date
    22.10.2012
    Posts
    25

    Default GI in IEC 60870-5-104

    Hi,
    we have the attached XML document with 104 communication. We start the connection without problems (STARTDT_ACT, STARTDT_CON) but when we request a general interrogation (GI) we start to receive data (simple points, double points, measurements) but we don't receive the termination confirmation for this request. That's a problem because the master will not know when the data transfer has finished. Have you any idea why the Process Gateway does not send this termination confirmation?
    Regards.
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  2. #2
    Join Date
    01.07.2008
    Location
    Salzburg, AT
    Posts
    1,039

    Default Re: GI in IEC 60870-5-104

    there are 2 very typical reasons why zenon Process Gateway IEC870Slave cannot terminate the General Interrogation:

    - when it does not have values for some of zenon variables configured to be IOs. This scenario is a configuration mismatch; it may happen when e.g. a variable which is in zenon a command (so 'write-only' in iec870, iec850 or DNP3 driver) is mistakenly configured in zenPG as an IO in monitoring, not control, direction. As in zenon, after project start, 'write-only' variables are "empty" until the user gives the first command (sets the value for the first time), the zenPG does not know what it should send to a remote master. Then GI will stay open "forever".

    - when the remote master sends new GI before the previous GI is completed. If the master sends a further GI while the current one has not yet been concluded, the ongoing GI is canceled and the new one is started. Overlapping GIs are logged as a warning. This is an indication of non-Standard-compliant behavior of the master.

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