Convert and String to an expression read by the runtime

Codesys V2.3 🇬🇧
fabou3377
2012-01-09
2012-01-09

  • fabou3377 - 2012-01-09

    Hi,

    Is there a way to convert a string in a expression which is evaluated on the runtime...
    Example

    VAR
myVar1:BOOL;
myVar2:BOOL;
sMyString:STRING;
END_VAR
sMyString:='myVar1 AND myVar2'
IF MYEVALUTEFUNCTION(sMyString) THEN
...
END_IF
     

  • Yegor - 2012-01-09

    Nope. This would require an on-board compiler and reflection facilities, which is too much for resource-constrained environment running compiled code. Nevertheless, if all needed was a simple arithmetic expression support, I'd make my own evaluator function. Too much responsibility for the operator though.

     

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