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v3.5 SP19 - Modbus TCP Devices - Channel Limit?

  • scoob

    scoob - 2023-05-04

    I have just updated a project from SP16 to SP19.

    I have added a new Modbus TCP Slave Device and started adding channels - I have added 10 and now it has greyed out the Add Channel button. Does anyone know if this is a bug, or a setting which needs changing?

    I opened another device which is already in the project, it has 81 channels already - but does have the button to add more greyed out?!

    Thank-you in advance!

  • kislov

    kislov - 2023-05-05

    It will be fixed in CODESYS Modbus
    Plan to release: 23/05/23

    • diguananhai

      diguananhai - 2023-05-26

      HI ,

      where i can download CODESYS Modbus

      • kislov

        kislov - 2023-05-26

        Tools - CODESYS Installer - check Updates tab

  • scoob

    scoob - 2023-05-05

    Hi kislov, thank-you for the update, I have found a work-a-round for now as I upgraded to start using Git.

    I did try downgrading (using update, and showing old versions) one of the modbus devices so it is version - but it still had the 10 channel limit.

    As a work-a-round for now if it helps anyone else, it seems I can create the modbus device with all the needed channels in an old project from v3.15 SP16 for example, then copy and paste it into the new project, then use the update device to bring it up to the latest version (at least that is the latest version I have installed)

  • scoob

    scoob - 2023-05-05

    Hi kislov, not sure if it would make any difference, but I tried adding a new modbus device in v3.5 SP16 - it wanted to add the latest version - I proceeded to add channels, and it will allow me to add more than 10 channels. It seems like it is SP19 that is introducing the limit, rather than the modbus device specifically.

  • kislov

    kislov - 2023-05-05

    This "limit" appeared as a bug along with the new (SP19 introduced) mechanism for processing "Paremeters lists" in Library Manager.

  • scoob

    scoob - 2023-05-09

    Thanks for clarifying kislov!

    I have just opened up an old project, in v3.5 SP16, the modbus definitions were missing (, so I "Downloaded the missing device description", now I get a build error saying:
    Max. number of Channels (10) exceeded ! - has the bug been introduced along with the release of SP19 but is backwards applicable as well for any downloads - older versions included?

  • kislov

    kislov - 2023-05-10

    Please upload simple test project from V3.5 SP16 with this error.

  • eschwellinger

    eschwellinger - 2023-05-11

    think this will be solved with version.


    Last edit: eschwellinger 2023-05-11

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