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Access Tool Management

Press MOD key, select 'Tool table' from the TNC menu to access tool management functions.

Check if tool table loads without errors first

Verify tool usage data integrity

Navigate to 'Tool usage' tab in tool table and check if usage times display correctly for active tools.

Note any tools showing abnormal usage values or error symbols

Reset tool usage database

In MOD menu, select 'Reset tool usage data' and confirm to rebuild the usage calculation database.

This will clear historical usage data but resolve calculation errors

Restart control system

Perform controlled shutdown and restart to reinitialize tool management system with clean database.

Check file system access

Press PGM MGT key and navigate to TNC:\ directory to verify TOOL.T file exists in the system folder.

Do not delete or modify system files without backup

Verify file attributes

Select TOOL.T file and check properties to ensure it's not marked as read-only or corrupted (file size should be >0 bytes).

Restore from backup

If TOOL.T is missing, restore from most recent backup via MOD menu 'Restore system data' function.

Check backup date to ensure tool data currency

Recreate tool usage file

If no backup available, create new TOOL.T by entering tool table and saving configuration to regenerate usage tracking file.

Access machine parameters

Press MOD key, enter machine parameter menu and navigate to tool monitoring parameters MP7440-MP7449.

Parameter changes require machine manufacturer authorization

Verify tool monitoring settings

Check MP7440 (tool usage monitoring) is set to 1 (enabled) and MP7441 (usage calculation method) matches machine configuration.

Reset parameters to default

If parameters appear corrupted, reset tool monitoring parameters to manufacturer defaults via MOD menu parameter reset function.

Document current values before resetting

Cycle power and test

Restart TNC control and run test program with tool call to verify usage time calculation resumes normally.

Check system diagnostics

Access MOD menu 'System info' and review error log for disk errors, memory faults, or file system warnings.

Hardware errors may indicate impending system failure

Run file system check

Execute TNC file system diagnostic via MOD menu 'Check file system' to identify and repair disk errors.

Backup critical data

Immediately backup all programs, tool tables, and configuration data to external storage before further troubleshooting.

Use multiple backup methods if system instability suspected

Contact service support

If file system errors persist, contact Heidenhain service as hardware replacement may be required.