I understand that to put a constant in OpenPLC Editor, I just need to put the number in Expression field in Variable Properties. My question is if it's possible to save my constant in a text file, and let the editor read the needed constant from that text file?

Qing Guo
S&C Electric Company

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Nope, you can't do that, and I don't see a reason why you would want something like that, unless you have an exorbitantly large number of constants to feed. But then you would have to type them anyway on the text file, wouldn't you?
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