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11
MAINTENANCE AND INSPECTION
11.5 When Battery Has Gone Flat during Storage of a programmable controller
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9
EMC AND LOW
VOLTAGE
DIRECTIVES
10
LOADING AND
INSTALLATION
11
MAINTENANCE AND
INSPECTION
12
TROUBLESHOOTING APPENDICES INDEX
11.5 When Battery Has Gone Flat during Storage of a programmable
controller
When the programmable controller is to be used after being stored for some period of time
and the battery has gone flat during storage, the memories in the CPU module may be
corrupted.
Hence, before resuming operation, always format the memories using GX Developer.
After formatting the memories, write the memory contents backed up prior to storage to
each memory.
The relationships between battery and battery-backed memories are shown in Table11.6.
: Battery backed, : Not battery backed
Format the battery-backed memories in Table11.6 using GX Developer before resuming
operation.
For information about the memory formatting, refer to the manual below.
GX Developer Operating Manual
POINT
1. Before storing the programmable controller, always back up the contents of
each memory.
2. The operation/error history cannot be written to the memory from GX
Developer.
Table11.6 Relationships between the battery and battery-backed memories
Memory
Battery
Q6BAT
CPU module
Program memory
Standard ROM ---- (Battery backup not needed)