Mitsubishi Electronics QSPCU ユーザーズマニュアル

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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.

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