Mitsubishi Electric MELSEC Q Series User Manual page 198

4 SET-UP AND PROCEDURE BEFORE OPERATION
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(2) Web server module battery (Q6BAT) life
(a) The following table shows the Web server module battery life.
Energization
Guaranteed value
time ratio 1
26,000 hour
0%
2.96 years
37,142 hour
30%
4.23 years
43,800 hour
50%
5 years
43,800 hour
70%
5 years
43,800 hour
100%
5 years
1 The energization time ratio denotes the ratio of power-on time in a day (24
hours).
(When power is on for 12 hours and off for 12 hours, the energization time ratio
is 50%.)
2 The guaranteed value represents a battery life at 70
guarantees based on the memory (SRAM) characteristics provided from parts
manufacturers and under the condition within the storage ambient temperature
range of -25 to 75
3 The actual service value (reference value) represents a battery life that is
calculated from the values actually measured at the storage ambient
temperature of 40 . Use it as reference since the actual service value may
change depending on the characteristics or variation of parts.
4 In either of the following status, the guaranteed time after power-off is 3
minutes.

The battery connector is disconnected.

The battery lead wire is broken.
(b) The battery (Q6BAT) life is 5 years when it is used without connecting to
the Web server module.
(c) Though the data is retained within the specified time after Battery status
area (buffer memory: 7) has turned on, replace the battery as soon as
possible.
However, it is recommended to replace the battery periodically according to
the usage status, even when the battery error has not yet occurred.
Important
Failure to replace the battery after battery error occurrence may cause erasure of
logging data, corruption of data in the standard ROM drive/CompactFlash card
during access, or a file system fault.
Battery life
Actual service value
2 (reference value)
43,800 hour
5 years
43,800 hour
5 years
43,800 hour
5 years
43,800 hour
5 years
43,800 hour
5 years
(operating ambient temperature of 0 to 55 ).
MELSEC-Q
Guaranteed time after battery error
3 occurrence
1,500 hour
62 days
1,500 hour
62 days
1,500 hour
62 days
1,500 hour
62 days
1,500 hour
62 days
that Mitsubishi
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