Omron Programmable Terminals NT31 NT31C - Manual (Page 224)

6-11 Section System Maintenance
214
Check the voltage of the NT31/NT31C’s built-in battery by following the menu
operation from the System Menu shown below.
Select Maintenance Mode.
Select I/O Check.
Select Device Check.
Select Battery.
The voltage is within the normal range. or
The voltage is lowered. is displayed.
Ver 3.10
After confirming the result of the check, press Quit. The NT31/NT31C returns to
the DEVICE CHECK MENU screen.
Checking the Battery
Voltage