Codesys runtime on Rpi and using a python script

Engineering 🇬🇧
ramas
2022-02-17
2022-02-18

  • ramas - 2022-02-17

    Hey guys so I am trying to run a python script during codesys runtime but i am getting a lot of errors in the POU, there are red underlines, I do not understand what i am doing wrong here.
    I have added the necessary libraries to run python while codesys runtime and followed the necessary steps, The python file should be copied into /var/opt/codesys and there is a log file that will also be created to log in the current time. However there seems to be a problem with my POU or the libraries are not syncing or something.

    If i could get some help form you guys that would be much appreciated:
    Here is the code:

    PROGRAM _PythonExecute
VAR
    dwCopySize: DWORD;
    dutResult : RTS_IEC_RESULT;
    szCommand : STRING(200);
    fbTimer : TON;
    szStdOout : STRING(1000);
    fbTimer1 : TON;
    Command : STRING(200);
END_VAR

(*
   /etc/CODESYSControl.cfg:
   [SysProcess]
   Command=AllowAll 
*)

IF NOT GVL.init THEN

    //Copy the scripts to local
    SysFile.SysFileCopy('/var/opt/codesys/hallo.py'
                        ,'/var/opt/codesys/PlcLogic/Application/hallo.py'
                        ,ADR(dwCopySize));


    //Change the permission that can execute
    SysProcess_Implementation.SysProcessExecuteCommand2(pszCommand:='chmod +x *.py'
                                                        , pszStdOut:=szStdOout
                                                        , udiStdOutLen:= SIZEOF(szStdOout)
                                                        , pResult := ADR(dutResult));

    //Init is finished
    GVL.init:=TRUE;

END_IF

//Flash Timer
fbTimer1(IN:= TRUE, PT:=T#1S); 

//Command 
Command:= 'sudo python hallo.py';

//Timer is ON
IF fbTimer1.Q  THEN
        //Reset it and flash again
        fbTimer1(IN:= FALSE);
        //Execute
        SysProcess.SysProcessExecuteCommand2(pszCommand:=Command
                                            , pszStdOut:=szStdOout
                                            , udiStdOutLen:= SIZEOF(szStdOout)
                                            , pResult := ADR(dutResult));
END_IF

    Could someone please tell me what I am doing wrong here.

     

    Last edit: ramas 2022-02-17
    Thumbnail
    POU.png

  • eschwellinger

    eschwellinger - 2022-02-17

    call it without sudo then it should work.

     

    Last edit: eschwellinger 2022-02-17

    • ramas - 2022-02-18

      Thank you for the feedback i will try it without sudo!, But i think there is something wrong with the code in itself. Which would explain why there are red lines as you can see in the attachment "POU.png".

       
      Thumbnail
      POU.png

    • ramas - 2022-02-18

      Thank you for the feedback i will try it without sudo!, But i think there is something wrong with the code in itself. Which would explain why there are red lines as you can see in the attachment "POU.png".

       

    • ramas - 2022-02-18

      Thank you but that did not work. SysFile.SysFileCopy is being called as a function, i can see it in the Call tree but the file is not being copied into the directory. I wonder why

       

  • hapeter - 2022-02-18

    sometimes we have to clean our glasses ;-) In the CODESYS Development System there are two Windows, one for declaring the variables, one for the programcode. The later is minimized in your screenshot below the line 48, I can only see one line with the red "1". Move your programcode in this window and the red underlining should disapear.

     

    • ramas - 2022-02-18

      Yes thank you hapeter that was the problem, I am relatively new to codesys hence the rather amateur questions.

       

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