Mitsubishi Electric Q02HCPU-A - 10.3 Operating a CPU Module After Being Stored Without a Battery

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10. MAINTENANCE AND INSPECTION
10.3 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.
The relationship between the backed-up memory and the batteries is explained below.
: Battery is backed up. : Battery is not backed up.
If data in the memory are backed up with the battery (refer to the table above), clear and
format the memory using a peripheral before operating the CPU module.
For memory clear/format operations, refer to the following manuals.
GX Developer Operating Manual
Type A6GPP/A6PHP Operating Manual
Type SW IVD-GPPA Operating Manual
The relationship between the backed-up memory and the batteries
Memory
Battery
Battery of the QCPU
Module
Battery Incorporated in a
Memory Card
CPU module
Built-in RAM
Built-in ROM – (Battery back up is not required.)
Device memory
Memory card SRAM card
POINT
(1) Make sure to back up each memory contents before storing a programmable
controller.
(2) When a programmable controller power supply is on or CPU module reset is
cancelled, a CPU module reviews the status of data below, and initializes all
the data if detecting an error.
• Latch data (latch relay (L), devices in latch setting range set in the
parameter)
• Sampling trace data
• Status latch data
• Special relay M9102 (SFC program continue start)