100014

Check Current Access Level

Navigate to HMI → Diagnostics → Service → Access Rights to verify current active access level and user permissions.

Document the current access level before making changes for rollback purposes.

Verify Operating Area Machine Data

Access machine data MD28002 (ACCESS_ENABLE_1) through MD28009 (ACCESS_ENABLE_8) to check operating area assignments for current access level.

Modifying access control parameters requires manufacturer or service level access.

Configure Missing Operating Areas

Set appropriate bit patterns in MD28xxx parameters to enable required operating areas (bit 0=manufacturer, bit 1=service, bit 2=end user, bit 3=key switch).

Use binary calculator to properly set bit combinations for multiple access levels.

Perform NCK Reset

Execute NCK reset via HMI → Commissioning → Reset → NCK Reset to activate new access level configuration.

NCK reset will interrupt all active operations and require system restart.

Verify User Login Status

Check HMI → System → User Management to confirm current user login and access level assignment.

Look for 'Guest' or 'Anonymous' user status which indicates authentication failure.

Re-authenticate with Proper Credentials

Log out current user and re-login with appropriate service or manufacturer level credentials for required operating area access.

Ensure you have valid passwords before logging out to avoid system lockout.

Check Password Validity

Verify password hasn't expired by checking MD28200 (PASSWORD_VALID_TIME) and system date/time settings.

Password expiration can be disabled by setting MD28200 to 0.

Validate Access Level Inheritance

Confirm MD28210 (ACCESS_LEVEL_INHERIT) is properly configured to allow access level inheritance between operating areas.

Check System Files Integrity

Navigate to HMI → Diagnostics → System → File System to verify access control database files in /siemens/sinumerik/hmi/cfg directory.

Look for .acc and .usr files with recent timestamps and non-zero file sizes.

Backup Current Configuration

Create complete system backup via HMI → Archive → Complete Backup before attempting database restoration.

Always backup before database operations to prevent total configuration loss.

Restore Access Database

Use HMI → Commissioning → Restore → Access Rights to restore access control database from last known good backup.

If no backup available, use factory default access settings and reconfigure manually.

Reinitialize User Management

Perform user management reinitialization through HMI → System → User Management → Initialize to rebuild database structure.

Check Physical Key Switch Position

Verify key switch position matches intended access level and switch operates smoothly without mechanical binding.

Clean key switch contacts with appropriate electrical contact cleaner if operation is intermittent.

Verify Key Switch Machine Data

Check MD28100 (KEYSWITCH_ENABLE) is set to 1 and MD28101 (KEYSWITCH_POSITIONS) matches physical switch configuration.

Incorrect key switch MD settings can cause permanent access lockout.

Test Key Switch Signal

Use HMI → Diagnostics → PLC → I/O Status to monitor key switch input signals and verify electrical continuity.

Key switch inputs typically appear in DB21 (interface signals) - check bits corresponding to access levels.

Bypass Key Switch Temporarily

Set MD28100 to 0 to disable key switch dependency for testing, then re-enable after confirming software configuration is correct.

Only disable key switch in secure environment as this removes hardware-based access protection.