Omron Programmable Terminals NT631C - Manual (Page 220)

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System Maintenance Section 6-11
Checking the RUN LED Check if the RUN LED functions normally.
Check the RUN LED by following the menu operation from the System Menu
shown below.
• If the RUN LED is functioning normally, it will operate as follows. At this
time the LED Check touch switch will be displayed in reverse video.
Lit in green - OFF - lit in red - OFF - lit in green...
• To end the LED check, press the LED Check touch switch on the DEVICE
CHECK MENU screen again.
Select Maintenance Mode.
Select I/O Check.
Select Device Check.
Select LED Check.
Ver 4.12