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Troubleshooting

Cannot Connect to the OPC UA Server

Check the following:

  • Whether the Endpoint URL is correct
  • Whether the OPC UA server is actually running
  • Whether network access is available

If Disconnected appears in the dashboard, check the endpoint and server status first.

The Job Is Running but No Values Are Stored

Possible causes:

  • The Node ID is incorrect
  • The node does not allow read access
  • The interval is normal, but the actual value is not changing
  • The selected Database Column configuration is not correct

Check the Node Mapping and Database Column configuration first.

Table or Column Selection Is Empty

Check the following:

  • Whether the Database Server connection works
  • Whether the account has permission to read the table list
  • Whether the actual table structure is prepared

String Values Are Not Stored

  • To collect string values, you must either select a JSON column in Value Column or choose a String Value Column.
  • If Value Column is a numeric column and String Value Column is empty, string values are not stored.
  • If Value Column is a JSON column, one collection cycle is stored as a JSON payload, so string values can also be stored there.
  • If the table has no numeric or JSON column and the form switches to string-only mode, selecting String Value Column is required.
  • Also check whether the selected table actually has a VARCHAR column for string storage.

The Last Collection Time Is Too Old

  • Check whether the job is actually running.
  • Check whether the OPC UA card shows Stale or Disconnected.
  • If needed, open the log files and look for repeated errors.

Recommended Practices

  • Start with only a few nodes and confirm that collection works.
  • Do not begin with an interval that is too short.
  • Add Transform settings only after basic collection is stable.

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