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Press the 'MENU SELECT' key and navigate to 'Commissioning' or 'Parameters' area to check current access level displayed on screen.

Enter the appropriate password level (typically service password level 3 or manufacturer password level 7) using the 'Password' softkey in the parameter menu.

Only authorized personnel should have access to service and manufacturer passwords. Document any password entry per company procedures.

Retry accessing the parameter after password authentication is successful.

If parameter access is still denied, verify the specific parameter number in the machine data documentation to confirm required access level matches your password level.

Note the specific parameter number that triggered the alarm from the alarm display.

Navigate to the main HMI/OP panel (PCU or touch screen operator panel) instead of using the BOP.

Access the parameter through HMI: 'Commissioning' → 'Machine Data' or 'Setting Data' depending on parameter type.

Changing machine parameters can affect machine behavior, accuracy, and safety. Always backup parameters before making changes.

If regular access is needed, consult SINUMERIK documentation to determine if parameter can be added to user-accessible lists or if operational procedure needs modification.

Power cycle the BOP by disconnecting and reconnecting it, or perform NCK reset (Mode selector to '0' position, then back to desired mode).

NCK reset will interrupt all machine operations. Ensure machine is in safe state and all axes are stopped.

Check BOP firmware version: Access diagnostics via service menu and compare BOP firmware with NCK/PLC versions for compatibility.

Verify BOP communication by checking for other intermittent alarms or display anomalies that would indicate hardware/connection issues.

If issue persists, attempt parameter access from HMI and contact Siemens service if BOP continues to malfunction across multiple parameter access attempts.