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EN/ENO issues, move block writing when EN is FALSE

mikael.engstrommikael.engstrom
in PLCnext Engineer

Hi, i have some move functions in sequence programming, and i have a move function with EN/ENO outside the sequence that will write 0 (init step) if we have an emergency stop. now i had a issue where i reset the alarm the signal is false, but the move block still keeps writing it to 0. Is this a known bug or?

//BR

Mike

Comments

  • steve.windhamsteve.windham

    I would say it is a known issue, but the developers do not consider this to be a bug. From previous posts on this forum, it does not appear the developers consider this needs to be addressed.

  • mikael.engstrommikael.engstrom

    Maybe in the next version... 😉

  • A EllisA Ellis

    Mikael,

    Which version of PLCnext are you using?

    Currently the move should only occur when the EN input is true, see below:

    image.png


    From the release notes it has been implemented this way since 2022.0.1 LTS version:

    image.png


    If you are using a version later than 2022.0.1 LTS, then double check that nothing else is writing to that variable.

  • mikael.engstrommikael.engstrom

    I'm running version 2023.3 but still having issues with the EN/ENO and also have TON_timers where the Q output is TRUE even do the IN input is FALSE. So I will upgrade to version 2023.6 soon, and hope that gets rid of a couple of the issues.

    But according to the release note if I make a move block that moves a 0 to the output, will this still set a zero if the EN = FALSE? in the text it says that the output keeps the value from the last valid processing of the function...

  • mikael.engstrommikael.engstrom
    TON_issues.png

    So why is the TON.Q True here?

  • DivisionByZeroDivisionByZero

    Can you verify (e.g. via cross references) that the instance TON103_2 is called only once in your code?

  • mikael.engstrommikael.engstrom
    https://forum.plcnext-community.net/discussion/comment/12655#Comment_12655
    TON_definition.png

    Well it is only declared locally, i have a copy of the program, so the TON declared with the same name but only locally, in two different programs. "Start_Stopp_Burner1" and "Start_Stopp_Burner2"

  • A EllisA Ellis

    Mikael

    It seems that TON.Q output is on, because the TON.IN input currently has a TRUE input which is holding the timer ON.

    Assuming, that TON103_2.IN is not set elsewhere, than the issue seems to be that the AND function is currently showing a TRUE ouput, when the the input logic is not correct for this ouput (the EQ function is currently FALSE) .

    Is this code being run in a standard program / FB and called in a cyclic Task? Or is it in a SFC or a program or FB that isn't being called in a cyclic manner. This may explain this behaviour if you can provide more information on where / how the program / FB is called.

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