Mitsubishi Electric MELSEC-Q Series User Manual page 34

USER PRECAUTIONS
PRECAUTIONS WHEN USING THE Q SERIES
For a new CPU module, which has never used before, the contents of
built-in RAM and device data are undefined.
Make sure to clear the built-in RAM memory (PC memory all clear) in
the CPU module by peripheral devices and operate latch clear by RUN/
STOP key switches.
PRECAUTIONS FOR BATTERY
(1) The operation after a battery is unmounted and the programmable
controller is stored.
When reoperating after a battery is uncounted and the
programmable controller is stored, the contents of built-in RAM and
device data may be undefined. For this reason, make sure to clear
the built-in RAM memory (PC memory all clear) in the CPU module
by peripheral devices and operate latch clear by RUN/STOP key
switch before start the operation again.
(2) If a battery exceeded its guaranteed life is stored and reoperated.
If a battery exceeded its guaranteed life is stored and reoperated,
the contents of built-in RAM and device data may be undefined. For
this reason, make sure to clear the built-in RAM memory (PC
memory all clear) in the CPU module by peripheral devices and
operate latch clear by RUN/STOP key switches before start the
operation again.
After the built-in RAM clear and latch clear of the CPU module,
write the backed-up memory contents to the CPU module before
saving.
POINT
Make sure to back-up each memory contents before storing the programmable
controller.
* Refer to the following manuals for details of built-in RAM clear
(programmable controller memory all clear) by peripheral devices.
•
GX Developer Operating Manual
• A6GPP/A6PHP Operating Manual
SWSRX/SWNX/SWIVD-GPPA Operating Manual
•
Refer to Section 4.5.3 for latch clear operation by RUN/STOP key
switch of the CPU module.
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