230-001B

Identify Parameter Being Modified

Check the alarm log detail to see which axis (%2) is affected. Note which machine parameter was being accessed - typically MP1xxx (axis-specific), MP3xxx (encoder), or MP4xxx (drive controller) parameters.

The alarm often occurs with parameters like encoder type (MP310x), current controller settings (MP43xx), or position monitoring windows (MP14xx).

Deactivate Main Voltage

Turn the main voltage switch on the control cabinet to OFF position. Wait for the voltage monitoring display on the TNC screen to show 0V. This fully deactivates all drive amplifiers.

Ensure machine is at a safe position before removing voltage. Note current position if resuming work after parameter change.

Access Parameter in MOD Mode

Press MOD key, enter password if required (typically 807667), navigate to the specific machine parameter. Make the required change while voltage is off. The parameter will now be accepted without alarm.

Changes to most drive-related MP parameters require a control restart to take effect - note this before proceeding.

Restore Power and Clear Alarm

Return main voltage switch to ON. Press CE (Clear Error) key to acknowledge alarm 230-001B. Check that all axes show ready status before attempting motion.

Review PLC Program Logic

In MOD mode, navigate to PLC > Program Overview. Search for any WPAR (Write Parameter) or direct MP parameter write instructions targeting the affected axis parameters.

Look for PLC code sections dealing with automatic axis configuration, tool change sequences, or commissioning routines that may write drive parameters.

Check Drive Enable Signal Logic

Examine the PLC outputs controlling axis enable signals (typically defined in MP7320x for each axis). Verify the PLC program deactivates these outputs before any parameter write operations.

Modifying PLC logic requires appropriate access level and understanding of machine safety interlocks.

Implement Proper Sequencing

Modify PLC program to: 1) Reset axis enable output, 2) Wait for drive ready signal to drop (check input status), 3) Write parameter using WPAR instruction, 4) Re-enable drive after parameter acceptance confirmation.

Add a timer delay of at least 100ms between drive deactivation and parameter write to ensure drive controller has fully processed the disable command.

Test Modified PLC Logic

Use PLC Test mode (MOD > PLC > Test) to single-step through the modified program logic. Verify the parameter write completes without triggering alarm 230-001B.

Exit Active Test Functions

Press the END or STOP key to terminate any active axis test functions. Navigate out of MOD > Axis Test menu completely, returning to the main operating mode screen.

Even having the Axis Test menu open can keep internal enable signals active - ensure you exit completely to MOD main menu.

Deactivate Drive Through Commissioning Menu

In MOD mode, navigate to Axis Parameters for the affected axis. Use the specific 'Deactivate Drive' function button if available in your TNC version, or cycle the NC/PLC switch off then on.

Some TNC versions (iTNC 530, TNC 640) have dedicated commissioning modes - ensure you exit these modes completely.

Modify Parameters in Safe State

With all commissioning functions inactive and drive deactivated, access the required machine parameters through MOD > Machine Parameters. Make necessary changes to encoder, motor, or controller settings.

Restart and Re-run Commissioning

Perform a control restart (CTRL+ALT+DEL for soft reboot, or power cycle). Re-enter commissioning mode and verify new parameters are active. Re-run axis tests to validate changes.