Appendix 8 Battery Life - Mitsubishi Electric MELSEC Q Series User Manual

Appendix 8
This section explains the C Controller module battery life.
Power-
Guaranteed
*1
on time
value
(70°C)
9,200hr
0%
1.05years
13,000hr
30%
1.48years
17,800hr
50%
2.03years
28,400hr
70%
3.24years
43,800hr
100%
5.02years
*1 : The power-on time ratio indicates the ratio of programmable controller 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 : Guaranteed value refers to the total power failure time in the storage ambient temperature range of -25 to 75°C
(operating ambient temperature between 0 to 55°C) guaranteed by Mitsubishi, subject to the characteristics value of the
memory (SRAM) supplied by the parts manufacture.
*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 : The guaranteed time after power OFF is 3 minutes in the following conditions.
• The battery connector is disconnected.
• The lead wire of the battery is broken.
● Use the battery within the time shown by the guaranteed value of the battery life.
● It it is expected that the battery guaranteed time is exceeded, backup the data.
● After battery error occurrence, data are retained within the "guaranteed time after battery error occurrence" above, but
replace the battery as soon as possible.
Even if an alarm has not yet occurred, it is recommended to replace the battery periodically according to the operating
condition.
● If the battery is not replaced after any battery error, the following data stored in the battery backup RAM may be
initialized, or wrong values may be stored instead.
• Event history information (If this is initialized, an event that notifies of error detection in the event history
information is registered.)
• Clock data (If this is initialized, it is reset to 00:00:00, Jan, 1, 2000.)
● When the battery (Q6BAT) is not connected to the C Controller module, its service life is five years.
Battery Life
Q6BAT
Guaranteed
Actual service
value
*2
battery error
*3
(Reference value)
occurrence
(40°C)
36,100hr
4.12years
43,800hr
5.02years
43,800hr
5.02years
43,800hr
5.02years
43,800hr
5.02years
Battery life
Guaranteed
time after
*2
value
*
(70°C)
4
456hr 25,000hr
18days 2.86years
600hr 35,200hr
25days 4.02years
600hr 43,800hr
25days 5.02years
600hr 43,800hr
25days 5.02years
600hr 43,800hr
25days 5.02years
APPENDICES
Q7BAT
Actual service Guaranteed
value time after
battery error
*3
(Reference value)
(40°C) occurrence
43,800hr 600hr
5.02years 25days
43,800hr 600hr
5.02years 25days
43,800hr 600hr
5.02years 25days
43,800hr 600hr
5.02years 25days
43,800hr 600hr
5.02years 25days
487
*4
A