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11.3 Battery Life and Replacement Procedure
11.3.1 Battery lives of CPU modules
11
MAINTENANCE AND INSPECTION
11.3.1 Battery lives of CPU modules
* 1: The power-on time ratio indicates the ratio of programmable controller power-on time to one day
(24 hours).
(When the total power-on time is 12 hours and the total power-off time is 12 hours, the power-on
time ratio is 50%.)
* 2: The guaranteed value represents a battery life at 70 , which is calculated based on the
characteristic values of manufacturer-supplied memories (SRAM) and on the assumption of
storage within the ambient temperature range of -40 to 75 (operating ambient temperature of 0
to 55 ).
* 3: The actual service value (reference value) represents a battery life that is calculated based on the
values measured at storage ambient temperature of 40 . This value is intended for reference
only, as it varies with characteristics of the memory.
* 4: In the following status, the backup time after power OFF is 3 minutes.
•The battery connector is disconnected.
•The lead wire of the battery is broken.
Table11.3 Battery lives
CPU Module
Type
Power-on Time
Ratio
*1
Battery lives
Guaranteed
value
*2
Actual service
value (Reference
value)
*3
After SM52 ON
(Backup time after
alarm
*4
)
QS001CPU
0%
26,000hr
2.96 years
43,800hr
5.00 years
710hr
30 days
30%
37,142hr
4.23 years
43,800hr
5.00 years
710hr
30 days
50%
43,800hr
5.00 years
43,800hr
5.00 years
710hr
30 days
70%
43,800hr
5.00 years
43,800hr
5.00 years
710hr
30 days
100%
43,800hr
5.00 years
43,800hr
5.00 years
710hr
30 days