Replacement Procedure Of The Cpu Module Battery - Mitsubishi Q01CPU User Manual

11
MAINTENANCE AND INSPECTION

11.3.3 Replacement procedure of the CPU module battery

Replace the battery of the CPU module by the following procedures when it comes to the
end of its life.
The programmable controller power must be on for 10 minutes or longer before
dismounting the battery.
Data in the memory are backed up for a while by a capacitor even after the battery is
removed. However, since data in the memory may be erased if the time for replacement
exceeds the backup time shown in Table11.8 to Table11.11, replace the battery quickly.
(1) Replacement procedure for the Basic model QCPU's Q6BAT battery
Backup the program and the
data.
Turn OFF the programmable controller
power supply.
Open the CPU module front cover.
Remove the old battery from its
holder.
Insert a new battery into the holder
in the correct direction. Connect
the lead to the connector.
Close the CPU module front cover.
Turn ON the programmable controller
power supply.
SD52 to check if bit 0 is
Failure of CPU module battery
11
- 22 11.3 Battery Life and Replacement Procedure
11.3.3 Replacement procedure of the CPU module battery
Replacing battery
Monitor
OFF
SM51 to check
ON/OFF.
ON
Monitor
ON.
Bit 0 is ON.
Diagram 11.2 Replacement procedure for the Q6BAT battery
Table11.8 Backup time
Backup time
3 minutes
Connector CPU
module side
Bit 0 is OFF.
CPU module
Connector
battery side
Completed