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Why do I get the error code OL9-21581 Illegal Modbus function code when trying to run the Concept simulator?

Issue:
Why do I get the error code OL9-21581 Illegal Modbus function code when trying to run the Concept simulator?

Product Line:
Concept

Environment:


Cause:


Resolution:
You will get this error if you have 984LL sections in the Concept project.  Concept simulator will only run on IEC sections only.  A work around would be to delete the 984LL sections in the project.
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