Replacing The Battery In N-Type Cpu Units - Omron CP1E Series User Manual

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.
Battery Service Life and Replacement Period
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).
Model number
CP1E-N D -A
* 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.
Memory Backup Time
5 years
4 years
3 years
2 years
1 year
* This graphic is for reference only.
CP1E CPU Unit Hardware User's Manual(W479)
Approx. maximum
lifetime lifetime (See note.)
5 years 13,000 hours
(1.5 years)
CP1E N-type CPU Unit
25˚C 40˚C 55˚C
7 Maintenance and Inspection
Approx. minimum Typical lifetime
(See note.)
43,000 hours
(5 years)
Ambient temperature
7
7 - 5