Modbus bugs with CODESYS V3.5 SP15

  • francoinf

    francoinf - 2019-11-13

    Hi all,
    my problem is that the modbus does not work properly with the SP15, while it works well with the SP11.
    With the SP11 I can read all the parameters, while with the SP15 I don't. To better explain the situation,
    I have attached two images, where it can be seen that with the SP11 I can read all the modbus parameters,
    while with the SP15 some yes and others not.
    What can I do to solve the problem?

    IMG: modbus

  • francoinf

    francoinf - 2019-11-13

    NOTE: I am using CODESYS CONTROL FOR RASPBERRY PI SL V3.5.15.10 as runtime

  • fleaplc

    fleaplc - 2019-11-22

    Did you try to sniff the communication with Wireshark to better understand if there's some error into a slave channel?

  • francoinf

    francoinf - 2020-01-30

    Hi fleaplc, what is WIRESHARK?

  • RoryLDM

    RoryLDM - 2020-01-30

    If it's Modbus RTU you will not be able to use Wireshark. Not without a protocol converter anyway. Here is a tutorial about thatlook here. Honestly just google what you're looking for, there is quite a bit of information available on wireshark. It's a pretty standard tool for a few people that are trying to decode or troubleshoot network traffic.

    Wireshark is...

    Wireshark is an open source tool for profiling network traffic and analyzing packets. Such a tool is often referred to as a network analyzer, network protocol analyzer or sniffer.


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