Mitsubishi MELSEC User Manual

11 - 6
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 PLC 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 battery service life; equivalent to the total power failure time that is calculated
based on the characteristics value of the memory (SRAM) supplied by the manufacturer and
under the storage ambient temperature range of -40 to 75 (operating ambient temperature of 0
to 55 ).
* 3: The actual battery service life; equivalent to the total power failure time that is calculated based on
the measured value and under the 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 (70 )
*2
Actual service
value (Reference
value)
*3
(40 )
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

Mitsubishi MELSEC Specifications

General

Brand	Mitsubishi
Model	MELSEC
Category	Controller
Language	English