126-011E

Access MOD Function

Press MOD key (or use control key + MOD softkey), navigate to 'System Configuration' then 'Option Codes' to view currently installed licenses and compare against machine documentation.

On iTNC 530 and newer, Option Codes are displayed with feature descriptions. Write down all active codes before any service work for backup documentation.

Locate Original Option Code Documentation

Check machine acceptance documentation, commissioning records, or contact machine tool builder for original Option Code list. Codes are machine-specific and tied to control serial number.

Option Codes are often recorded on a label inside the electrical cabinet or in the machine commissioning binder - check these sources first.

Enter Missing Option Codes

In MOD > System Configuration > Option Codes, use 'Enter New Option Code' function and input the alphanumeric code exactly as documented. Control will validate and activate immediately.

Option Codes are control serial number specific. Codes from another machine will not work and may cause registration issues.

Perform Control Restart

After entering Option Codes, perform complete control restart (power cycle) to ensure all licensed modules initialize properly. Verify alarm clears and function is accessible.

Some Option Codes activate immediately, but kinematics and axis-related licenses typically require full restart to reinitialize the NCK.

Check System Directory for FKF

Navigate to TNC:\system\ directory in File Management (PGM MGT key). Look for files with .FKF extension. Note the filename and timestamp to verify it matches expected license file.

Use 'Show All Files' option in PGM MGT to ensure hidden system files are visible. FKF files are sometimes hidden by default.

Verify FKF Validity

Access MOD > System Information > License Information to view FKF status, expiration date (if applicable), and enabled features. Compare against purchased license scope.

Do not delete or modify FKF files manually. These are cryptographically signed and any modification will invalidate the license.

Restore FKF from Backup

If FKF is missing, restore from system backup (TNC:\system\backup\ or external backup media). If no backup exists, contact Heidenhain or machine builder with control serial number and proof of purchase for license reissue.

Always include TNC:\system\ directory in regular backup procedures. FKF files are critical and cannot be regenerated without Heidenhain involvement.

Handle Expired Time-Limited Licenses

If license shows as expired in MOD > License Information, contact Heidenhain or authorized distributor for license renewal. Provide control serial number and existing license information for upgrade or extension.

Demo and trial licenses are often time-limited. Check purchase documentation to confirm whether permanent or temporary license was acquired.

Verify Licensed Axis Count

In MOD > System Information, check 'NCK Configuration' or 'License Information' section for maximum licensed axes. Note the number of controlled axes and spindles permitted.

Heidenhain licenses distinguish between positioning axes, interpolating axes, and controlled spindles. Verify which type is needed for your application.

Review Machine Parameter Axis Assignment

Access machine parameters (MP key or MOD > Machine Parameters) and review MP100-105 (CfgAxisNames). Count configured axes including linear and rotary. Also check MP114 (number of axes) and MP115 (number of spindles).

Do not arbitrarily change axis configuration without proper machine documentation. Incorrect axis assignment can cause dangerous machine behavior.