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Enter Service mode: Press HMI Commissioning -> Service -> Safety Integrated.

Navigate to NCK machine data and check the affected axis %1 parameters: $MA_SAFE_VELO_LIMIT, $MA_SAFE_VELO_LIMIT_2, $MA_SAFE_POS_LIMIT_PLUS, $MA_SAFE_POS_LIMIT_MINUS for unauthorized changes.

Review $MN_SAFE_ACTIVE_CHECKSUM and compare against $MN_SAFE_CALCULATED_CHECKSUM to identify mismatch.

Execute Safety Acceptance Test from Safety Integrated menu: Select 'Calculate and accept safety checksum' to regenerate valid checksum.

Requires Know-How Protection password and safety authorization. System will require safety re-validation.

Perform NCK reset (Power ON with NC Start) to activate new checksum.

Check NCK system status: Navigate to Diagnostics -> NCK -> System Data. Verify battery voltage and memory status indicators.

Access Service -> NCK -> Machine Data and export all $MN_SAFE_*, $MN_PROFISAFE_*, $MA_SAFE_* parameters for affected axis to external storage for comparison.

Restore safety MDs from archived commissioning data (INI files): Commissioning -> System Data -> Load Machine Data.

Ensure backup data is from certified safety acceptance test. Incorrect data compromises machine safety.

Re-execute complete Safety Acceptance Test procedure via Safety Integrated -> Acceptance Test to validate and generate new checksum.

If corruption persists, replace NCK battery (if voltage <2.8V) and reload complete NCK backup archive.

System downtime required. Safety certification must be re-validated.

Navigate to Commissioning -> HW Config -> PROFIsafe and verify PROFIsafe address configuration for axis %1 drive matches $MN_PROFISAFE_DEST_ADDR settings.

Check drive safety parameters via STARTER/TIA: Compare F-DI/DO assignments and safety telegram configuration with NCK $MN_PROFISAFE_* settings.

Verify $MN_PROFISAFE_TIMEOUT value matches drive F_IPRO_TIME configuration (typical 50-150ms range).

Synchronize parameters: Update NCK safety MDs to match drive configuration or vice-versa, then execute Safety Acceptance Test to generate valid checksum.

Both NCK and drive safety configurations must be synchronized. Requires safety authorization.

Perform full PROFIsafe diagnostics: Diagnostics -> Drive -> PROFIsafe to verify telegram integrity and monitoring times.

Verify NCK software version: Commissioning -> System -> Version. Check that Safety Integrated option is properly licensed (Safety License active).

Review NCK bootlog: Diagnostics -> NCK -> Boot Protocol for safety module initialization errors or version conflicts.

Re-install Safety Integrated software package from SIEMENS distribution media matching NCK firmware version.

Complete system backup required before software reinstallation.

Restore safety MD configuration from certified archive and execute complete Safety Acceptance Test sequence.

Document safety software version and acceptance test results per EN ISO 13849 requirements for machine safety certification.

Safety certification documentation must be updated.