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Thread: Reading Modbus variable that contains multiple words

  1. #1
    Join Date
    26.11.2009
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    automationengineer20@gmail.com
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    59

    Default Reading Modbus variable that contains multiple words

    hi,

    I need to read the Fault recorder value from Areva P122 device with Modbus RTU protocol by zenon. This device has 5 fault recorders and modbus address to upload them are as below:

    3700h Fault 1
    3701h Fault 2
    ……
    3704h Fault 5

    each of them contains 15 words according attached file. Also there is instruction for reading them by manufacture.

    How do I apply manufacture instruction for reading my desire data from device with Modbus protocol by zenon?

    The version of zenon is 6.51 SP0.
    Thanks in advance
    Attached Thumbnails Attached Thumbnails selected pages.pdf   P12x_enct_f75.pdf  

  2. #2

    Default Re: Reading Modbus variable that contains multiple words

    Have you found a solution for this?

    The modbus energy driver does support reading event data from Areva devices from the type MiCOM P126 / P127, but I'm not sure if the P122 also supports the functionality available in the P126 / P127.

  3. #3
    Join Date
    26.11.2009
    Location
    automationengineer20@gmail.com
    Posts
    59

    Default Re: Reading Modbus variable that contains multiple words

    Hi mark

    I tested all of data types that supports by zenon and also RGM but it seems that there is no solution for it.
    I think my problem is one of below items:
    1.I cannot define a new tag that includes 15 words with one address point (only for first word)
    2.I cannot access to structure of modbus message in zenon for defining it and send to device

    I don’t use from modbus energy driver because it needs IP connection and also is not easy. I think the reading Holding register is easy and does not needs VBA.
    The difference between P122 and P126/P127 are in their protections functionality so their Modbus modules are same.

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