Validation of a global variable

Engineering 🇬🇧
rahulnshinde
2010-12-21
2011-02-21

  • rahulnshinde - 2010-12-21

    Hi,
    I wish to check if a string name communicated to the codesys controller is a valid global variable
    For e.g. In myController (Codesys)

    Type myDataType:
    a : INT ;
    b : STRING ;
    END_TYPE

    VAR_GLOBAL
    myVar : myDataType ;
    END_VAR

    The external system (another controller) is not aware of existence of 'myVar'. It will simply pass the name in the form of STRING for e.g. var_name = 'myVar'.
    Is it possible that codesys program can check whether such a global variable exists?

    Regards,
    Rahul.

     

  • DaveW - 2011-02-21

    Hi,

    I am sorry that I can't help you but I too would like to know the answer. I have a different application in mind. I would like to read the value of global variables, but first I need to resolve if the name exists.

    So I would like to use a variable name string to find the variable.

    thanks

    DaveW

     

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