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7 Maintenance and Inspection
CP1E CPU Unit Hardware User’s Manual(W479)
7-2 Replacing the Battery in N/NA(S)-type CPU Units
7
Use the following procedure to replace the Battery when the previous Battery has become completely
discharged.
Precautions for Safe Use
We recommend replacing the Battery with the power OFF to prevent the CPU Unit’s sensitive
internal components from being damaged by static electricity. The Battery can be replaced with-
out turning OFF the power supply. To do so, always touch a grounded piece of metal to discharge
static electricity from your body before starting the procedure.
After replacing the Battery, connect a Programming Device and clear the Battery error.
1
Turn OFF the power supply to the N/NA
(S
)-type CPU Unit.
If the CPU Unit has not been ON, turn it ON for at least 30 minutes and then turn it OFF.
Additional Information
There is a capacitor inside the N/NA
(S
)-type CPU Unit that backs up memory when the
Battery is removed. If power is not turned ON for at least 30 minutes before replacing the Battery,
the capacitor will not be fully charged and memory may be unstable before the new Battery is
inserted.
2
Open the compartment on the CPU Unit and carefully draw out the Battery. Remove the Battery
connector. Connect the new Battery, place it into the compartment, and close the cover.
Replacing the Battery
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