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Access Startup Menu

Navigate to Operating Area > Startup > Machine Data > Display Machine Data on the HMI.

Use Service level access (password 3) for full display MD visibility

Verify Save Operation

Check that display parameters like $MN_DISPLAY_RESOLUTION or $MN_MM_DISPLAY_RESOLUTION were modified before save.

Incorrect display settings can affect operator interface functionality

Acknowledge Alarm

Press the alarm acknowledgment key or softkey to clear the informational message.

This alarm auto-clears after acknowledgment as it's purely informational

Verify Display Function

Test all HMI display functions to ensure saved parameters are working correctly.

Locate Brightness Controls

Access Startup > Basic Display and identify the LCD brightness softkeys on the HMI panel.

Brightness settings are stored in display MD $MN_HMI_BRIGHTNESS_LEVEL

Check Brightness Parameter

Verify the current brightness setting in machine data and ensure it's within acceptable range (typically 1-10).

Extreme brightness settings can cause display hardware premature failure

Test Brightness Persistence

Power cycle the HMI to confirm brightness setting is retained, validating the MD save operation.

Brightness changes should persist immediately without requiring manual save

Clear Informational Alarm

Acknowledge the alarm using the standard alarm acknowledgment procedure.

Check Backup Schedule

Review $MN_BACKUP_AUTOMATIC_ENABLE and related backup machine data to verify automatic save settings.

Automatic saves typically occur during low-activity periods

Verify Display MD Integrity

Compare current display MD values with previous backup using the machine data comparison function in startup menu.

Corrupted display MD can cause HMI malfunction

Review System Log

Check the NCK alarm log for any preceding alarms that might have triggered the automatic save operation.

Validate Save Completion

Confirm all display-related machine data parameters are properly stored in non-volatile memory.

Identify Changed Parameters

Review recently modified display MD including $MN_DISPLAY_LANGUAGE, $MN_DISPLAY_RESOLUTION, and color scheme parameters.

Use the MD change log to track recent parameter modifications

Validate Configuration

Test all modified display settings to ensure proper HMI functionality and user interface responsiveness.

Invalid display configurations can render the HMI unusable

Perform HMI Reset Test

Execute a controlled HMI restart to verify configuration persistence and proper system initialization.

Document Changes

Record the configuration changes in the machine documentation for future reference and troubleshooting.