Mitsubishi Electric Melsec Q Series User Manual page 119

4
SETTINGS AND PROCEDURE TO OPERATION
(2) Battery (Q6BAT) life
(a) The following shows the service life of the QJ71MES96 MES interface module
0%
30%
50%
70%
100%
(b) The battery (Q6BAT) life is 5 years when disconnected to the module.
(c) Even though the data is retained for the specified time after the Battery status
battery.
Power-on time
*1
Guaranteed value
ratio
26,000 hours
2.96 years
37,142 hours
4.23 years
43,800 hours
5 years
43,800 hours
5 years
43,800 hours
5 years
*1 The power-on time ratio denotes the ratio of power-on time in a day (24 hours).
(If the power is ON for 12 hours and OFF for 12 hours, the power-on time ratio is 50%.)
*2 The guaranteed value represents a battery life at 70°C, which is calculated based on characteristic
values of manufacturer-supplied memories (SRAM) and on the assumption of storage within the
ambient temperature range of -25 and 75°C (operating ambient temperature of 0 to 55°C).
*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°C. This value is intended for reference
only, as it varies with characteristics of the memory.
*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.
area (Buffer memory address: 7) is 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.
If the battery is not replaced after a battery error occurs, data in the CompactFlash
card being accessed may be corrupted or a file system error may occur.
Table 4.10 Battery life
Battery life
Actual service value
*2
*3
(Reference value)
43,800 hours
5 years
43,800 hours
5 years
43,800 hours
5 years
43,800 hours
5 years
43,800 hours
5 years
4.8.3 Battery replacement
Guaranteed time after battery
*4
error
1,500 hours
62 days
1,500 hours
62 days
1,500 hours
62 days
1,500 hours
62 days
1,500 hours
62 days
4
4.8 Battery
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