Mitsubishi Electric MELCEC Q Series User Manual page 116

7. MEMORY CARD AND BATTERY
(2)
POINT
After replacing a battery, write the date for next battery replacement on the sticker
on the back side of the front cover.
Write the proper date by checking the battery life.
SRAM card battery replacement procedure
Replace the battery of the SRAM card by following the procedure below when the life
of the battery is over. The memory card does not have the secondary battery to back
up the memory. To retain data, the battery should be replaced while the SRAM card is
installed in the CPU module with the power on.
POINT
Note the following precautions before replacing a battery.
(a) To back up data, replace the SRAM card battery with the programmable
controller power on and the SRAM card installed.
(b) Before replacement, back up the CPU module data using GX Developer.
(c) Since replacement is performed with the programmable controller power on,
pay attention not to get an electric shock.
(d) When removing or installing the battery holder from/in the SRAM card, pay
attention not to drop the battery out of the battery holder.
(e) When replacing a battery with the programmable controller power off, always
back up the data before starting replacement.
[Battery replacement procedure]
1) Back up the SRAM card data using GX Developer.
2) Replace the battery.
3) Write the backed up data from the GX Developer to the memory card.
Q02HCPU
MODE
RUN
ERR.
USER
BAT.
BOOT
ON SW
1
2
3
4
5
STOP RUN
RESET L.CLR
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