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4.8 Battery
4.8.3 Battery replacement
4
SETTINGS AND PROCEDURE TO OPERATION
(2) MES interface module battery (Q6BAT) life
(a) The following shows the service life of the MES interface module battery.
*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.
(b) The battery (Q6BAT) life is 5 years when disconnected to the MES interface
module.
(c) Even though the data is retained for the specified time after the Battery status
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
Power-on time
ratio
*1
Battery life
Guaranteed value
*2
Actual service value
(Reference value)
*3
Guaranteed time after battery
error
*4
0%
26,000 hours
2.96 years
43,800 hours
5 years
1,500 hours
62 days
30%
37,142 hours
4.23 years
43,800 hours
5 years
1,500 hours
62 days
50%
43,800 hours
5 years
43,800 hours
5 years
1,500 hours
62 days
70%
43,800 hours
5 years
43,800 hours
5 years
1,500 hours
62 days
100%
43,800 hours
5 years
43,800 hours
5 years
1,500 hours
62 days