How to read the variables defined in Program Unit via OFS?

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Issue

How to read the variables defined in Program Unit via OFS?

Product Line

Control Expert V14.0, OFS V3.62

Environment

Control Expert V14.0, OFS V3.62, M580

Resolution

Only the variables defined in the global project can be read via OFS.
But if you define the variables in Program Unit as external variables with the same and data type as the ones defined in the global project, then you can read the variable in OFS Client.