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Thread: IEC 60870-5-104 standard

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  1. #1
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    Default IEC 60870-5-104 standard

    My question is interrogation group ()COT 21-36) is part of the IEC 60870-5-104 standard or not?
    if we look for a definition of this standard:
    IEC 60870-5-101 [IEC101] is a standard for power system monitoring, control & associated communications for telecontrol, teleprotection, and associated telecommunications for electric power systems.
    • Possibility of classifying the data into different groups (1-16) to get the data according to the group by issuing specific group interrogation commands from the master
    IEC 60870-5-104 (IEC 104) protocol is an extension of IEC 101 protocol with the changes in transport, network, link & physical layer services to suit the complete network access.
    that mean that standard IEC 60870-5-104 must have interrogated by interrogation group 1 (Cause of transmission ( COT 21-36)) or not , it's not part from the IEC 60870-5-104 standard

  2. #2
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    Salzburg, AT

    Default Re: IEC 60870-5-104 standard

    The group interrogation - COT 21..36 is part of -5-101 inherited then by -5-104 part of the Standard. But to support it is not mandatory; only the support of general interrogation - COT 20 - is mandatory. After the connection is established the Master must send the general interrogation (COT=20) to the Slave. The Slave must close the connection when it does not get GI at start.

    The group interrogation can be used to "manual" request parts of data; only when data in slave was additionally grouped. IMHO not very useful, the data should be already on master up-to-date - received by first GI and then spontaneously updated. And for additional periodical "backup" transmission there is better mechanism - background scan. We haven't implemented group interrogation.
    BTW, for next zenon version the bacground scan will be smothly extended.

  3. #3
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    Default Re: IEC 60870-5-104 standard

    Thank you Ursula for your answer.
    My question, it's just the client requests that we must follow the IEC 60870-5-104 standard, if we say that "scan group" is not a mandatory part of the IEC 60870-5-104 standard, and we are not forced to provide this.
    My answer is correct or incorrect ?

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