Mitsubishi Q2ACPU User Manual page 335

21. MAINTENANCE AND INSPECTION
The battery life guideline and the replacement procedures are explained on the following
pages.
POINTS
The relationship of back up between the status of the batteries installed in the
CPU module and memory cards is explained below.
The following two points are applied.
1) The battery installed in the CPU module does not back up the RAM memories
of the memory cards.
2) The batteries installed in the memory cards do not back up the built-in RAM of
the CPU module.
AC power supply
for CPU module
ON
OFF
Memory card
CPU module battery
battery
ON
ON
OFF
ON
OFF
OFF
ON
ON
OFF
ON
OFF
OFF
21 - 5
CPU module Memory card
memory memory
: Back up is possible.
: Back up is not possible.