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Check file existence in configuration directory

Navigate to HMI → Service → System data → Browse files and locate the /siemens/sinumerik/cfg/ directory to verify if MMC0_TXV.INI exists.

Use the integrated file browser rather than external tools to avoid permission issues.

Restore from backup archive

Access HMI → Commissioning → System data → Archive and restore the most recent backup containing the MMC0_TXV.INI file.

Ensure machine is in safe position before restoring system data.

Verify file integrity and restart NCK

After restoration, perform a complete NCK reset via HMI → Service → NCK → Reset and monitor alarm status during startup sequence.

Verify software version consistency

Check HMI → Service → Version to ensure all SINUMERIK components (NCK, HMI, PLC) have matching version numbers and no partial installations exist.

Document all version numbers before making changes for rollback purposes.

Reinstall MMC components

Use SINUMERIK Operate → Service → Software update to reinstall the MMC package, ensuring the MMC0_TXV.INI file is properly deployed.

Perform complete system initialization

Execute a full system startup sequence via HMI → Service → Startup and monitor the alarm list for successful MMC0_TXV.INI loading.

Check file system integrity

Access Windows desktop via HMI → Service → Windows desktop and run chkdsk on the system drive to verify file system integrity.

Only perform disk operations during scheduled maintenance windows.

Verify SINUMERIK service permissions

Ensure SINUMERIK services are running with appropriate system privileges and can access the configuration directory structure.

Reset file permissions and restart services

Restore default permissions on the /siemens/sinumerik/cfg/ directory and restart all SINUMERIK services via Service Control Manager.

Use the SINUMERIK Service Tool for proper service restart sequence.

Perform storage diagnostics

Use HMI → Service → Diagnostics → Storage to check CompactFlash card health and identify any bad sectors or read errors.

Storage failures can cause complete system loss - backup immediately if possible.

Create emergency backup

If storage is still partially functional, immediately create a complete system backup via HMI → Commissioning → System data → Archive to external media.

Replace storage media and restore system

Install new CompactFlash card, perform clean SINUMERIK installation, and restore from backup archive to recover MMC0_TXV.INI file.

Keep spare CF cards with identical SINUMERIK versions for emergency replacement.

Verify network configuration parameters

Check HMI → Commissioning → Network settings and ensure all IP addresses, subnet masks, and communication protocols match the system requirements.

Reset communication interfaces

Restart network services via HMI → Service → Communication and verify MMC communication channels are properly established.

Validate MMC parameter consistency

Cross-reference MMC settings in machine data MD11210 (MMC_LINK_MASK) and related communication parameters with the expected MMC0_TXV.INI configuration.