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Acknowledge the alarm by pressing the CANCEL ALARM key or soft button on the HMI.

If this was intentional, proceed with your planned reconfiguration or restore machine data from a known good backup.

Ensure you have valid backup files before proceeding with any restore operations.

Reboot the control system to ensure all changes take effect and verify proper startup sequence.

Verify machine data and configuration are correctly loaded by checking axis configuration and relevant NC/PLC settings.

Check the alarm log and PLC diagnostics buffer for any preceding alarms related to file system errors, checksum failures, or memory issues.

Perform a CompactFlash card or system drive integrity check using the HMI Service menu under PLC > Memory Card.

If card errors are detected, backup critical data immediately before card failure occurs.

Restore machine data from a verified backup archive using Archive System or appropriate restore procedures for your 840D version.

Ensure the backup file is compatible with your current NCU firmware version.

After restore, cycle power completely and monitor for recurring boot file issues which may indicate hardware failure.

Acknowledge the alarm and verify this occurred during planned commissioning or update activities.

Continue with the commissioning procedure by loading the appropriate machine data package for your machine configuration.

Ensure correct machine data version matching your mechanical configuration and safety requirements.

After loading machine data, perform a complete power cycle and verify all axes, spindles, and PLC functions operate correctly.

Run through a complete machine reference and test program to validate configuration, then create a new baseline backup for future recovery.

Document all changes and firmware versions in the machine service log.