Description of the Behavior:
It is not possible to access a structure element of the PLC application from, for example, an external visualization.
Under what conditions does this behavior occur?
When creating the symbol configuration file for structure elements with the BIT data type, the PLC Designer calculates an incorrect byte offset. As a result, external access to this structure element (e.g., via OPC UA) is not possible.
Affected products:
PLC Designer version 3.0 and later
Short-term measures:
In structures, use the 'BOOL' data type instead of 'BIT' if you want to add variables of this structure data type to the symbol configuration.
Assessment/Recommendations:
Due to this functional limitation, it is not possible, for example, to access a structure element of a variable from an external visualization. An application-specific solution is described under “Short-term measures.”
Note: No change is planned for this behavior.
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