Mitsubishi MELSEC L Series User Manual page 90

(3) Q7BAT replacement procedure
Connector of
CPU module
Connector of
battery
Battery
Q7BAT
Connector
88
Battery holder
Latch
Battery holder
Connector stopper
1.
Remove the CPU module from the DIN rail, and open
the battery holder located at the bottom of the CPU
module.
2.
Take out the battery from the holder.
3.
Disengage the latches on the battery holder sides to
open the holder, and remove the Q7BAT.
4.
Put the new Q7BAT into the holder in correct
orientation, and close the holder so that the battery
cable is pulled out from the hole on the joint.
5.
Connect the connector of the new battery to that of
the CPU module. Then, store them in the battery
holder.
Fix the connectors to the connector stopper of the
holder.
6.
Close the battery holder and mount the CPU module
to the DIN rail.