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Check system file integrity

Navigate to HMI → Diagnostics → System data → File system and verify the integrity of files in /siemens/sinumerik/lng/ and /siemens/sinumerik/data/ directories.

Use the built-in file system check to identify corrupted files before manual inspection.

Restore language files

Access Service → Software → Restore and reload the language package from the original installation media or backup.

Ensure you have the correct software version matching your SINUMERIK system before restoration.

Verify file checksums

Compare file checksums in the system log against known good values from Siemens documentation or backup system.

Document working checksums during commissioning for future reference.

Check storage device status

Navigate to HMI → Diagnostics → Hardware → Storage devices and examine the CompactFlash card status and error counters.

Do not remove CompactFlash card while system is powered - always perform proper shutdown first.

Perform storage diagnostics

Run the built-in storage test via Service → Diagnostics → Storage test to identify bad sectors or read errors.

Check the write/erase cycle count - CompactFlash cards typically fail after 10,000-100,000 cycles.

Replace storage media

If diagnostics show failures, replace CompactFlash card and restore system from backup using SINUMERIK Operate recovery procedures.

Use only Siemens-approved CompactFlash cards to ensure compatibility and reliability.

Check file permissions

Access Service → System → File management and verify read permissions on affected text files in system directories.

Standard SINUMERIK text files should have read permissions for system user and group.

Reset file permissions

Use Service → Software → System recovery → Reset file permissions to restore default access rights for system files.

This operation may require system restart and could affect custom configurations.

Verify user account integrity

Check that the SINUMERIK system user account has not been corrupted by examining user management in Service → System → User administration.

Document current user settings before making changes for easy rollback if needed.

Check network connectivity

Navigate to HMI → Commissioning → Network → Diagnostics and verify connection to network drives or file servers.

Use ping test from SINUMERIK diagnostics to verify network path availability.

Verify drive mounting

Check Service → System → External drives to ensure network drives or USB devices are properly mounted and accessible.

Ensure network credentials are still valid and have not expired.

Test file access

Manually navigate to the external file location using SINUMERIK file browser to verify read access to the specific text file mentioned in the alarm.

Copy critical text files to local storage to avoid network-dependent failures.