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11.3 Battery Life and Replacement Procedure
11.3.2 Replacement Procedure of the CPU Module Battery
11
MAINTENANCE AND INSPECTION
11.3.2 Replacement Procedure of the CPU Module Battery
Replace the battery by the following procedure when the Q6BAT battery of the CPU
module comes to the end of its life. The battery replacement can be performed regardless
of the SAFETY MODE or TEST MODE.
The PLC 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 Table11.4, replace the battery quickly.
Table11.4 Backup time
Backup time
3 minutes
Figure 11.2 Replacement procedure for the Q6BAT battery
Turn off the PLC.
Turn on the PLC.
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 connector to the connector.
Close the CPU module front cover.
ON
OFF
Bit 0 is ON.
Bit 0 is OFF.
Failure of the replaced battery
Completed
Monitor
SM51 to verify
ON/OFF.
Monitor
SD52 to check if bit 0 is
ON.
Battery replacement
STOP
RESET
RUN
PULL
BAT.
CPU module
BAT.
Connector of
CPU module side
Connector
of battery side
Save the error/operation history data
as a file with GX Developer. (*1)
*1: The CPU module backs up the error/operation history data with a
battery. In the SAFETY MODE, sequence programs and parameters
are saved in the standard ROM. When replacing the battery, save
the error/operation history data as a backup file with GX Developer.
For details, refer to the GX Developer Version 8 Operating Manual
(Safety PLC).
