Mitsubishi Electric MELCEC Q Series User Manual page 19

USER PRECAUTIONS
Precautions for using a CPU module
When a CPU module is used for the first time, data in the CPU module (built-in RAM, device
data) and in the memory card are undefined.
Before writing data (parameters, programs) to the CPU module, clear data in the built-in RAM
using a peripheral (PC memory clear operation) and also clear data using the RESET/L.CLR
switch of the CPU module (latch clear operation).
Precautions for battery
(1)
(2)
Operating a CPU module after being stored without a battery
When a CPU module is operated again after being stored without a battery, data in the
CPU module (built-in RAM, device data) and a memory card may be undefined.
Before operating the CPU module again, clear data in the built-in RAM using a
peripheral (PC memory clear operation) and also clear data using the RESET/L.CLR
switch of the CPU module (latch clear operation).*
After all data are cleared, write the backed-up data in the CPU module or the memory
card.
Operating a CPU module after being stored over the battery life
When a CPU module is operated again after being stored over the battery life, data in
the CPU module (built-in RAM, device data) and a memory card may be undefined.
Before operating the CPU module again, clear data in the built-in RAM using a
peripheral (PC memory clear operation) and also clear data using the RESET/L.CLR
switch of the CPU module (latch clear operation).*
After all data are cleared, write the backed-up data in the CPU module or the memory
card.
POINT
Make sure to back up each memory contents before storing the programmable
controller.
* For details of the PC memory clear operation using a peripheral, refer to the following manuals.
GX Developer Operating Manual
A6GPP/A6PHP Operating Manual
SW IVD-GPPA Operating Manual
For the latch clear operation using the RESET/L.CLR switch of the CPU module, refer to Section
4.6.3.
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