Sure, the variable should be "Application.GVL.DI0" but I get no compilation error. Moreover, I didn't write the text "Application.GVL.DI0", I've selected the variable as follows: Press OK: Maybe this is another bug in the PLC engineering non-related to the PLC license problem. As you suggested, I've rename the mapped variable > "Build - Clean all" > "Login" > same result > PLC license problem
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