Operating A Cpu Module After Being Stored Over The Battery Life - Mitsubishi Electric MELCEC Q Series User Manual

10. MAINTENANCE AND INSPECTION

10.4 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.
The relationship between the backed-up memory and the batteries is explained below.
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
The relationship between the backed-up memory and the batteries
Memory
Built-in RAM
CPU module Built-in ROM
Device memory
Memory card SRAM card
IVD-GPPA Operating Manual
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)
Battery of the QCPU
– (Battery back up is not required.)
: Battery is backed up.
10 - 5
Battery
Battery Incorporated in a
Module Memory Card
: Battery is not backed up.