When Plc Has Been Stored Without A Battery - Mitsubishi MELSEC User Manual

11
MAINTENANCE AND INSPECTION

11.4 When PLC Has been Stored without a Battery

When the PLC operation is to be resumed after being stored with the battery removed, 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 memorie are shown in Table11.5.
CPU module
Format the battery-backed memories in Table11.5 using GX Developer before resuming
operation.
For information about the memory formatting, refer to the manual below.
Table11.5 Relationships between the battery and battery-backed memories
Memory
Program memory
Standard ROM
GX Developer Operating Manual
POINT
1. Before storing the PLC, always back up the contents of each memory.
2. The operation/error history cannot be written to the memory from GX
Developer.
11.4 When PLC Has been Stored without a Battery
Battery
Q6BAT
---- (Battery backup not needed)
: Battery backed, : Not battery backed
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