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Check installed software keys

Press MOD key, navigate to Software Options > Key Information. Review the list of installed keys and note the expiration dates. Identify which key shows 'Expired' status.

Document the key ID number and option name exactly as shown - you'll need this information when contacting Heidenhain for renewal.

Verify system date accuracy

Go to MOD > System Settings > Date/Time. Confirm the system date is correct. If the date was accidentally set forward, the key may have been invalidated prematurely.

Never set the system date backward to circumvent key expiration - this can corrupt the license database and cause additional alarms.

Contact Heidenhain for license renewal

Contact Heidenhain Technical Support or your authorized service representative with the control serial number (visible in MOD > System Information) and expired key ID to request a renewed license.

Have your purchase order or original machine documentation ready - license renewals may require proof of original purchase or active service contract.

Load renewed license key

Once you receive the new license file (.KEY or .XML format) on USB stick, insert USB into control. Go to MOD > Software Options > Load Key File and select the new license file. Confirm loading and reboot the control.

Always keep a backup copy of all license key files on your facility's server or secure storage location.

Inspect USB dongle physically

Power down the control. Remove the USB license dongle and inspect for physical damage, bent pins, or corrosion. Check that the USB port on the control is clean and undamaged.

Always power down the control before removing USB dongles to prevent data corruption or system errors.

Reseat the dongle and reboot

Insert the dongle firmly into a different USB port on the control (preferably on the front panel). Power up and wait for complete boot cycle. Check if alarm clears and key is recognized.

Heidenhain USB dongles should remain connected at all times - they are not hot-swappable during operation. Mount them securely to prevent accidental removal.

Verify dongle recognition in system

Go to MOD > Software Options > Key Information. If the dongle is working, you should see the hardware key listed with its associated options. If not visible, the dongle or USB port may be faulty.

The control log file (TNC:\system\logfile.txt) may contain additional USB device enumeration errors - check this via file manager for diagnostic clues.

Replace defective dongle

If dongle is not recognized after testing multiple USB ports and rebooting, contact Heidenhain with the dongle serial number (usually printed on device) to request replacement. Dongles cannot be repaired.

Replacement dongles must be ordered through official Heidenhain channels with proof of original purchase - they are serialized to prevent unauthorized duplication.

Check system date after cold boot

Power down the control completely for 30 seconds. Power up and immediately check MOD > System Settings > Date/Time. If the date has reset to a default value (typically 2000-01-01 or similar), the backup battery is depleted.

On iTNC 530 and TNC 620/640 controls, battery status can be monitored via PLC battery monitoring inputs - check your machine PLC program for battery warning signals.

Replace system backup battery

Identify the backup battery location (typically X28 battery holder on main NC board). Order correct replacement battery (usually 3V CR2032 lithium). With control powered ON, replace battery following proper anti-static precautions.

Battery must be replaced with control powered ON to prevent loss of system parameters. Use only specified battery type - incorrect voltage can damage the real-time clock circuit.

Set correct date and time

After battery replacement, go to MOD > System Settings > Date/Time and set the correct current date and time. Confirm settings are saved.

If your control is networked, consider enabling NTP time synchronization in MOD > Network Settings to automatically maintain accurate time.