Mitsubishi Electric C70 Connection Manual page 54

PLC CPU module type
Q13UD(E)HCPU
Q20UD(E)HCPU
Q26UD(E)HCPU
*1: The frequency of battery usage indicated battery consumption of PLC CPU. (Target CPU modules for
Q03UDCPU, Q04UDHCPU, and Q06UDHCPU are the first 5 digits of the serial No. is "10012" or later.)
The bigger the frequency of battery usage is, the higher amount of battery per unit time is consumed.
The frequency of battery usage depends on the elements (a) and (b). The following table shows the
relationship between the combination pattern of (a) and (b) and the frequency of battery usage.
Elemets to decide how much battery is used
(a) Battery long-life function (Note)
With setting
Without setting
(Note) Refer to the following manual for battery long-life function.
QnUCPU User's Manual (Function Explanation, Program Fundamentals) SH-080807(ENG)
*2: The power-on time ratio indicates the ratio of PLC 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%.)
*3: The guaranteed value; 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 to 75 (operating ambient temperature of 0 to 55).
*4: The actual service value; equivalent to the total power failure time that is calculated based on the
measured value and under the storage ambient temperature of 40. This value is intended for reference
only, as it varies with characteristics of the memory.
Frequency of
Power-ON
battery
time ratio*2
usage*1
0%
30%
1 50%
70%
100%
0%
30%
2 50%
70%
100%
0%
30%
3 50%
70%
100%
0%
30%
4 50%
70%
100%
(b) State of a file storage during standard RAM
Size of a register file during RAM (SR) < Unit:
No file register or 0k<SR <= 128k
Life time of the battery
Guaranteed Actual ser-
value*3 vice value*4
(70 ℃ ) (40 ℃ )
22,600hr 43,800hr
32,200hr 43,800hr
43,800hr 43,800hr
43,800hr 43,800hr
43,800hr 43,800hr
4,100hr 26,200hr
5,800hr 37,400hr
8,200hr 43,800hr
13,600hr 43,800hr
43,800hr 43,800hr
2,300hr 18,600hr
3,200hr 26,500hr
4,600hr 37,200hr
7,600hr 43,800hr
43,800hr 43,800hr
1,500hr 13,800hr
2,100hr 19,700hr
3,000hr 27,600hr
5,000hr 43,800hr
43,800hr 43,800hr
word
-
128k<SR <= 384k
384k<SR
C70 Connection Manual
2.4 PLC CPU
Backup time after
alarm*5
600hr
600hr
600hr
600hr
600hr
384hr
384hr
384hr
384hr
384hr
192hr
192hr
192hr
192hr
192hr
144hr
144hr
144hr
144hr
144hr
Frequency of
battery usage
1
2
3
4
35