Omron Programmable Terminals NT631C - Manual (Page 222)

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System Maintenance Section 6-11
• If the backlight is normal, it flashes. At this time, the Backlight Check
touch switch is displayed in reverse video.
• To end the backlight check, press the Backlight Check touch switch again.
Screen Data Memory
Check Check if the screen data memory is functioning normally.
Reference: • In the screen data memory check, a write test is performed on the screen
data memory. Since all the screen data in the NT631/NT631C is lost in
this check, confirm that this data is backed up at the Support Tool or
Memory Unit before executing it.
• If writing to the screen data memory is disabled by the setting for System
Settings in the System Installer mode, it is not possible to execute a
screen data check.
• Once a screen data check has been started, it cannot be stopped.
Select Maintenance Mode.
Select I/O Check.
Select Device Check.
Select Backlight Check.
Ver 4.12