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Thread: Process Gateway: General Interrogation (T100) to IEC870 Slave

  1. #1
    Join Date
    15.07.2019
    Posts
    2

    Ausrufezeichen Process Gateway: General Interrogation (T100) to IEC870 Slave

    Dear Support Team:


    I noticed that it is necessary to send general interrogation (T100) to the Process Gateway IEC870-104 Slave in order to receive spontaneous values, but is it possible that IEC870-104 Slave sends spontaneous values automatically after successful connection (or re-connection) to the IEC870-104 Master?
    Is it mandatory to send always general interrogation to the slave in this case? or Does it depend on Master or Slave configuration?

    I really appreciate your help.


    PD: zenon Energy Edition 8.00 SP0 Build 52082


    Best regards,

    Jose Alejandro

  2. #2
    Join Date
    23.10.2018
    Posts
    12

    Default Re: Process Gateway: General Interrogation (T100) to IEC870 Slave

    Hello,

    According to the 60870 standard, indeed the General Interrogation is mandatory at the beginning of the communication.
    Thus, after the startup of the Slave, it will wait for a certain time (called the T1 timeout) and if it never receives a GI from the Master, it closes the session.
    Spontaneous data changes will be sent by the Slave only for data points responded in the GI.

    Best regards,
    Anthony

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