125-00D2

Power Down Control Safely

Perform controlled shutdown via MOD > Shut Down System. Wait for confirmation before removing power.

Never remove power during active write operations as this can corrupt the file system.

Access CF Card Slot

Open the control's front panel or access door to reach the CompactFlash card slot. Refer to machine documentation for specific location (typically behind front panel on TNC 320/530/620/640).

On some iTNC 530 models, the CF card is accessible via a front panel door without removing the entire housing.

Check Write-Protect Switch

Examine the CF card for a small sliding switch on the side. Ensure it is in the unlocked position (opposite from the lock symbol or arrow direction marked on card).

Reseat and Reboot

Firmly reseat the CF card in the slot, power on the control, and attempt the configuration write operation again. Verify alarm clears after system boot completes.

Check System Partition Space

Press MOD key, navigate to System Information or Disk Status screen. Check free space on TNC:\ or SYS:\ partition. Minimum 50MB free space required for reliable operation.

On iTNC 530 and TNC 640, press MOD > Service > System Information to see detailed partition usage.

Clean System Log Files

Navigate to TNC:\system directory using PGM MGT key. Delete or archive old error.log, plc.log, and trace files. These can accumulate to hundreds of megabytes over time.

Remove Obsolete Backup Files

Check TNC:\system\backup and TNC:\system\config directories for old .bak and .old files. Delete outdated backups while preserving recent configuration backups.

Always verify you have external backups before deleting system configuration files.

Archive Tool Management Data

If tool table files (tool.t, tooltab.*, pockets.pck) are excessively large, export to external storage and clean up obsolete tool entries using tool management functions.

Retry Configuration Write

After freeing disk space, reboot control and attempt the original configuration change that triggered the alarm. Monitor free space regularly to prevent recurrence.

Identify Specific File

Note the exact file path shown in the alarm message '%1' parameter. Common files include machine.cfg, plc.cfg, OEM.cfg, or parameter files in TNC:\system\config directory.

Access alarm history via Alarm Softkey > History to see the complete alarm text with full file path if truncated on screen.

Check File Attributes

Press PGM MGT key, navigate to the file location. Highlight the file and press EDIT ATTRIBUTE softkey. Verify 'Read Only' checkbox is NOT selected.

Do not modify attributes on system-critical files unless directed by Heidenhain service or machine tool builder.

Close Active Configuration Dialogs

Exit all MOD function menus, machine parameter screens, and PLC configuration tools. Ensure no other terminal sessions are accessing configuration files.

Reboot to Clear File Locks

Perform controlled shutdown via MOD > Shut Down System and reboot. This releases any file locks from interrupted processes or system services.

Verify Write Access

After reboot, attempt the configuration change again. If alarm persists on specific file, check file permissions using external PC with card reader and file system tools.

Review System Error Logs

Navigate to TNC:\system\error.log using PGM MGT key. Look for disk I/O errors, bad sector warnings, or repeated write failures. Note timestamps correlating with alarm occurrences.

Search for keywords like 'I/O error', 'sector', 'disk write', or 'media fault' in the error.log file.