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Access OPC UA Configuration

Navigate to MOD function → System Parameters → Communication → OPC UA Server settings in the TNC control.

Use PLC programming mode for full access to OPC UA parameters

Verify Namespace Definitions

Check CfgOpcUaNamespace entries and ensure the namespace referenced in the alarm exists with correct URI and index values.

Document existing settings before making changes

Create Missing Namespace

Add the missing namespace configuration using the TNC's configuration editor, ensuring proper namespace URI and unique index assignment.

Restart OPC UA Service

Cycle the OPC UA server service through the TNC system menu to apply namespace changes.

Check Configuration File Integrity

Access TNC file manager and navigate to SYS:\OpcUa\ directory to examine configuration files for corruption or missing entries.

Compare file timestamps with recent system changes

Restore from Backup

If available, restore OPC UA configuration from a known good backup using TNC's system restore functionality.

Ensure backup compatibility with current TNC software version

Rebuild Configuration

If no backup exists, manually recreate the namespace configuration based on the alarm's referenced namespace identifier.

Validate Configuration

Use TNC's built-in OPC UA diagnostics to verify namespace registration and object creation success.

Review Update Documentation

Check HEIDENHAIN software release notes for OPC UA configuration changes in the current TNC software version.

Focus on breaking changes in OPC UA implementation

Compare Pre/Post Update Settings

Access MOD function → Machine Parameters and compare current OPC UA settings with pre-update backup if available.

Update Namespace References

Modify CfgOpcUaObject and CfgOpcUaPlcVar configurations to match new namespace structure or indexing scheme.

Test OPC UA Connectivity

Use external OPC UA client to verify namespace visibility and object accessibility after configuration updates.

Examine Namespace Index Table

Navigate to TNC diagnostics → OPC UA → Namespace Table to view current index assignments and URIs.

Namespace indices are assigned dynamically and may change between restarts

Cross-Reference Object Definitions

Check CfgOpcUaObject entries and verify namespace index values match those shown in the namespace table.

Correct Index References

Update object and variable configurations with correct namespace indices using TNC configuration editor.

Implement Dynamic Referencing

Where possible, use namespace URI references instead of fixed indices to prevent future index mismatch issues.