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Appendix B
Battery Service Life
The built-in battery is used for retaining the status of the HR and DM areas, the user’s program, and other specified
status while power is not being supplied to the CQM1. The total number of hours that the battery can provide
backup power will vary as shown below, depending on the ambient temperature and whether or not a Memory
Cassette with a clock is installed.
Memory Cassette
i h l
k
Total hours with no current supplied
y
with clock
Guaranteed time (see note 1)
Capacity (see note 2)
No
43,000 hrs (Approx. 5 years)
43,000 hrs (Approx. 5 years)
Yes
34,500 hrs (Approx. 4 years)
,
(
y
)
Note 1. Total hours with no current supplied, at an ambient temperature of 55
°
C.
2. Total hours with no current supplied, at an ambient temperature of 25
°
C.
1
2
3
4
5
Total Time with No Current Supplied (in Years)
No Memory Cassette with
clock function
Memory Cassette with
clock function
Ambient temperature
25
°
40
°
55
°
Note The effective life of the battery is five years. Replace the battery every five years even if it could be used
longer.
