Omron Programmable Terminals NT631 Setup Manual page 220

System Maintenance
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.
Ver 4.12
• 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.
Section 6-11
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