Mitsubishi Electric Q26UD(E)HCPU User Manual page 265

Be careful about the following to replace the SRAM card battery.
● To back up the data, replace the SRAM card battery with the programmable controller power supply on and the SRAM
card installed.
● Start replacement after backing up the CPU module data using a programming tool.
● Since replacement is made with the programmable controller power supply ON, take extreme care not to get an electric
shock.
● When dismounting or mounting the battery holder on the SRAM card, take care so that the battery does not come out of
the battery holder.
● When replacing the battery with the programmable controller power supply off, always back up the data before starting
replacement.
[Battery replacement procedure]
1) Back up the SRAM card data using the programming tool.
2) Replace the battery.
3) Write the backed up data from the programming tool to the memory card.
Insert or remove the battery in the horizontal direction along the battery holder fixing guide.
Failure to do so may damage the latches of the battery holder.
Battery holder latches
● If a battery of the SRAM card is hard to replace, use of the following tweezers is recommended.
Product
Plastic tweezers
Battery fixing guide
Battery holder
CHAPTER 13 MAINTENANCE AND INSPECTION
Model name
NK-2539
13
263