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7 Maintenance and Inspection
CP1E CPU Unit Hardware User’s Manual(W479)
7-2 Replacing the Battery in N-type CPU Units
7
7-2 Replacing the Battery in N-type CPU
Units
Mount the CP1W-BAT01 Battery (sold separately) to an N-type CPU Unit if data in the following areas
need to be retained after a power interruption.
• DM Area (D) (excluding words backed up to the EEPROM using the DM function )
• Holding Area (H)
• Counter Present Values and Completion Flags (C)
• Auxiliary Area related to clock function (A)
A Battery cannot be mounted to an E-type CPU Unit.
The procedure to replace the Battery on an N-type CPU Unit is given below.
At 25ºC, the maximum service life for the Battery is five years whether or not power is supplied to the
CPU Unit while the Battery is installed.
The Battery’s lifetime will be shorter when it is used at higher temperatures.
The following table shows the approximate minimum lifetimes and typical lifetimes for the backup Bat-
tery (total time with power not supplied).
* The minimum lifetime is the memory backup time at an ambient temperature of 55°C.
The typical lifetime is the memory backup time at an ambient temperature of 25°C.
Battery Service Life and Replacement Period
Model number
Approx. maximum
lifetime
Approx. minimum
lifetime (See note.)
Typical lifetime
(See note.)
CP1E-ND-A 5 years 13,000 hours
(1.5 years)
43,000 hours
(5 years)
1 year
2 years
3 years
4 years
5 years
25˚C 40˚C 55˚C
Memory Backup Time
Ambient temperature
* This graphic is for reference only.
CP1E N-type CPU Unit
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