Mitsubishi Electric Melsec-Q172DCPU User Manual page 131

2 SYSTEM CONFIGURATION
Module type Battery type
Q173D(S)CPU/
Battery (Q6BAT)
Q172D(S)CPU
(Note-1): The actual service value indicates the average value, and the guaranteed value indicates the minimum value.
(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.
(2) Data back-up of Motion CPU module by the battery
Be sure to use the battery.
• For Q173DSCPU/Q172DSCPU
Set the battery (Q6BAT) to battery holder.
• For Q173DCPU(-S1)/Q172DCPU(-S1)
Set the battery (Q6BAT) to battery holder unit (Q170DBATC).
The programs, parameters, motion devices(#), latch range devices and absolute
position data of SRAM built-in Motion CPU module are not backed up without
using the battery.
In the following status, the backup time after power OFF is 3 minutes.
• The battery connector/Q6BAT lead connector is disconnected.
• The battery cable/lead wire of Q6BAT is broken.
Power-on
time ratio
(Note-2)
0%
30%
50%
70%
100%
POINTS
The self-discharge influences the life of battery without the connection to Motion
CPU module. 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) (Note-4)
value value
(MIN) (TYP)
(75°C (167°F)) (40°C (104°F))
20000
27000
31000 43800
36000
43800
2 - 98
(Note-1)
Actual service
(Note-5)
value
Backup time
(Reference value)
after alarm
(TYP)
(25°C (77°F))
90
(After
43800
SM51/SM52
ON)