Mitsubishi Electric Melsec-Q172DCPU User Manual page 104

2 SYSTEM CONFIGURATION
Module type Battery type
Internal
battery
Q172DEX
(A6BAT/
MR-BAT)
(Note-1): The actual service value indicates the average value, and the guaranteed time indicates the minimum time.
(Note-2): The power-on time ratio indicates the ratio of Multiple CPU system power-on time to one day (24 hours).
(When the total power-on time is 17 hours and the total power-off time is 7 hours, the power-on time ratio is 70%.)
(Note-3): The guaranteed value (MIN) ; equivalent to the total power failure time that is calculated based on the characteristics value of the
memory (SRAM) supplied by the manufacturer and under the storage ambient temperature range of -25°C to 75°C (-13 to
167°F) (operating ambient temperature of 0°C to 55°C (32 to 131°F)).
(Note-4): The guaranteed value (TYP); equivalent to the total power failure time that is calculated based on the normal air-conditioned
environment (40°C (104°F)).
(Note-5): The actual service value (Reference value) ; equivalent to the total power failure time that is calculated based on the measured
value and under the storage ambient temperature of 25°C (77°F). This value is intended for reference only, as it varies with
characteristics of the memory.
Do not short a battery.
Do not charge a battery.
Do not disassemble a battery.
Do not burn a battery.
Do not overheat a battery.
Do not solder the battery terminals.
Before touching the battery, always touch grounded metal, etc. to discharge static electricity from
human body. Failure to do so may cause the module to fail or malfunction.
Do not directly touch the module's conductive parts and electronic components. Touching them
could cause an operation failure or damage the module.
(c) Battery life
Power-on
time ratio
(Note-2)
0%
30%
Q171ENC-W8/
50%
Q170ENC 1
70%
100%
0%
30%
Q171ENC-W8/
50%
Q170ENC 2
70%
100%
POINTS
The self-discharge influences the life of battery without the connection to Q172DEX.
The external battery should be exchanged approximately every 4 or 5 years.
Exchange the battery with a new one in 4 to 5 years even if a total power failure
time is guaranteed value or less.
Battery life (Total power failure time) [h]
Guaranteed Guaranteed
(Note-3)
value value
(MIN)
(75°C (167°F)) (40°C (104°F))
3000
4000 11000
6000 16000
10000 26000
43800 43800
1500
2000
3000
5000 13000
43800 43800
CAUTION
2 - 71
(Note-1)
Actual service
(Note-5)
value
(Note-4)
(Reference value)
(TYP)
(TYP)
(25°C (77°F))
8000 24000
34000
43800
43800
43800
4000 12000
5500 17000
8000 21900
21900
43800
Backup time
after alarm
40
(After Error
code 1152
occurrence)