The available evidence confirms that the Prosys OPC UA SDK for Delphi supports structure values and that its tutorials were updated to explain their use. It does not identify the required API calls, type identifiers, SDK version, or server-specific structure definition, so those details must be taken from the installed SDK documentation rather than inferred.
Define the write target
Identify the server variable that accepts the structure and obtain its complete data-type definition. A whole-structure write must preserve the server-defined field set, field order, and field data types; do not substitute guessed identifiers or layouts.
| Required input | Evidence status | Engineering action |
|---|---|---|
| Client SDK | Prosys OPC UA SDK for Delphi | Use the structure-value guidance in the updated tutorials. |
| Structure type | Not specified | Read the definition exposed by the target server. |
| Write API and identifiers | Not specified | Confirm them in the documentation for the installed SDK version. |
| Server variable | Not specified | Select the variable whose declared type matches the structure. |
Construct and write the structure
Use the SDK's documented structure-value representation to create a value that matches the server definition, populate every field required by that definition, and submit it through the existing client write operation. The evidence does not provide a safe Delphi class name or method signature, so copying an unverified code fragment could select the wrong encoding or API version.
- Open the updated SDK tutorial section covering structure values.
- Resolve the target variable and its declared structure type from the server.
- Create the SDK structure value using the documented type definition.
- Populate the fields without changing their declared types or order.
- Write the complete value to the target variable.
Verify the write
Check the write result and read the variable back. Compare the returned structure with the intended field values and server-defined types. If the write fails, first compare the client-side structure definition with the server definition; the supplied evidence contains no status code, firmware limitation, or version-specific defect that would justify a narrower diagnosis.
FAQ
Does the Prosys OPC UA SDK for Delphi support structure values?
Yes. The evidence states that the tutorials were improved to describe structure-value usage in more detail.
How do I write a whole OPC UA structure from Delphi?
Resolve the server's structure definition, build the matching SDK structure value, populate its fields, and pass the complete value to the client write operation. Confirm the exact classes and methods in the documentation for the installed SDK version.
How do I verify an OPC UA structure write?
Check the write result, read the target variable back, and compare every returned field and data type with the value submitted by the client.
