VAR_INFO from inside of a FB to get info on the instance.

  • yannickasselin1

    yannickasselin1 - 2019-12-02


    Is it possible to use __VARINFO inside a Function block to get info on the instance of the function block like this:

    stVarInfo := __VARINFO(THIS^);

    If I do this in TwinCat, VisualStudio crashes. I would like to get the name of the instance of the function block from inside the function block.

    Thank you.

  • yannickasselin1

    yannickasselin1 - 2019-12-03

    Thank you,

    It works but I also get the name of the TC project and the name of the PLC project in front of the variable name. I should be able to figure a way to get rid of what I don't need using some string functions.


    I only need 'Main.fbTest[0]'

    Thank you.

  • Anonymous - 2019-12-04

    Originally created by: scott_cunningham

    Those items you don’t want are part of the instance path, that is why they are included. Simply make a function that starts at the string end, and goes backwards until it finds the second period. Then return the MID of the string, starting at that point.


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