Lifetime And Replacement Interval Of Backup Battery - Panasonic FP7 Series User Manual

7.1 Handling of Backup Battery

7.1.3 Lifetime and Replacement Interval of Backup Battery

■
Lifetime of backup battery
Lifetime of backup battery
3.3 years or more
(Note 1) The lifetime indicated above is the value when no power at all is supplied.
(Note 2) Note that the lifetime in actual use may be shorter than the typical lifetime depending on the use
conditions.
(Note 3) Backup battery is consumed for the backup battery detection circuit, even while power is being
supplied. Lifetime while power is being supplied is approx. two times longer than the value when no
power is supplied.
■
Detection of errors and replacement interval of backup battery
● When voltage of the backup battery declines, the system relays (SR24 and SR25) are turned
on. As necessary, create a program for reporting the error to outside.
● If the system register's "Report Battery Error" setting is turned valid, the CPU ERROR LED
on the CPU unit flashes.
● Promptly replace the battery, though data are retained for about one week from the detection
of a backup battery error, even if no power at all is supplied.
● The retained memory data may become indefinite after one week has passed with no power
supplied, from the time when the system relays (SR24 and SR25) turned on or when the
ERROR LED on the CPU unit flashed.
● The system relays (SR24 and SR25) turn on when a backup battery error is detected,
regardless of settings in the CPU's configuration.
● Regardless of time passed from detection of a backup battery error, supply power to the CPU
unit for at least 5 minutes before replacing the backup battery.
7-4
Suggested replacement interval
5 years
WUME-FP7CPUH-09