Omron CS1W-LC001 Operation Manual page 220

Maintenance
3. Remove the battery together with its connector.
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4. Replace the old battery with a new battery within five minutes.
When removing the battery from the battery holder, take care not to catch
the connector cable on the battery holder.
5. Insert the new battery following steps 1 to 4 in reverse order.
6. Attach the battery compartment cover.
Note 3 When a database error (ITEM094 of System Common block is set to FFFF)
has occurred (when the nth word bit 04 of the allocated relay area turns ON),
RAM must be initialized using CX-Process Tool after the battery is replaced.
If RAM is not initialized, all function blocks other than the System Common
block (Block Model 000) cannot be accessed (read or written) by CX-Process
Tool, CX-Process Monitor or FINS commands.
Replacement battery
Name:
Block Model:
Battery life and replacement cycle
Battery life:
The maximum life of the battery is five years at an ambient temperature of
25°C regardless of how long the Loop Control Unit is powered ON or OFF.
Note that high ambient temperatures shorten the life of the battery.
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Section 7-2
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