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25.1.2 Backup Battery Lifetime and Replacement Time
Backup Battery Lifetime
Master memory
cassette
If installed
If not installed
(Note): Please notice that the service life may be reduced due to use conditions.
Backup battery abnormality detection and battery replacement time
• If the battery voltage drops, special internal relays (R9005, R9006) will turn to ON. Develop
an program to send an outside abnormal warning as needed.
• If the system register No. 4 "Alarm Battery Error" setting is effective, the ERR.LED of the
controller unit controller will flash.
• After the backup battery error is detected, the data can be maintained for about one week
without power. However, please replace the battery immediately.
When special internal relays (R9005, R9006) are ON or the ERR.LED of the
•
control unit is flashed, if the power outage lasts a week, the data saved in
the memory may be turned to 0.
•
Special internal relays (R9005, R9006) are independent of the system
register setting, if a backup battery error has been detected, it will turn to
ON.
•
Regardless of when the backup battery error was detected, power up the
control unit for more than 2 minutes when replacing the backup battery.
Type of Control Unit
M8N
25.1 Precautions for Using Backup Battery
Backup Battery
Lifetime
More than 5 years
Remarks
Run 8 hours per day
25-3
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