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MELSEC-Q
10 MAINTENANCE AND INSPECTION
10.3.1 Battery life
(1) CPU module battery (Q6BAT) life
(a) The CPU module battery life is given below.
Battery life
CPU Module
Type
Energization
Time Ratio
1
Guaranteed value
(MIN)
Value in actual use
(TYP)
After SM51 is energized
(Guaranteed time after
alarm occurrence)
0% 5433hr 13120hr 120hr
30% 7761hr 18742hr 120hr
50% 10866hr 26240hr 120hr
70% 18110hr 43733hr 120hr
Q02CPU
100% 10years 10years 120hr
0% 2341hr 6435hr 120hr
30% 3344hr 9192hr 120hr
50% 4682hr 12870hr 120hr
70% 7803hr 21450hr 120hr
Q02HCPU
Q06HCPU
100% 10years 10years 120hr
0% 1260hr 4228hr 48hr
30% 1800hr 6040hr 48hr
50% 2520hr 8456hr 48hr
70% 4200hr 14093hr 48hr
Q12HCPU
Q25HCPU
100% 10years 10years 48hr
1: The energization time ratio denotes the ratio of power-on time in a day (24 hours).
(When power is on for 12 hours and off for 12 hours, the energization time ratio is
50%.)
(b) The Q6BAT life is 10 years when it is used without connecting to the CPU
module.
(2) SRAM card battery life
The SRAM card battery life changes depending on the combination of the serial
number (first 5 digits) of the CPU module and the manufacturing control number
of the memory card.
The SRAM card battery life is indicated below.
(a) CPU module whose serial number's first 5 digits are "04012" or later
Battery life
SRAM card
Energization
Time Ratio
1
Guaranteed value
(MIN)
Value in actual use
(TYP)
After SM51 is energized
(Guaranteed time after
alarm occurrence)
0% 690hr 6336hr 8hr
Q2MEM-1MBS
Manufacturing
control number
" A"
2
100% 11784hr 13872hr 8hr
0% 2400hr 2.7years 20hr
30% 2880hr 3.6years 20hr
50% 4320hr 4.5years 20hr
70% 6480hr 5.0years 20hr
Q2MEM-1MBS
Manufacturing
control number
" B"
2
100% 5.0years 5.0years 50hr
0% 2400hr 2.7years 20hr
30% 2880hr 3.6years 20hr
50% 4320hr 4.5years 20hr
70% 6480hr 5.0years 20hr
Q2MEM-2MBS
100% 5.0years 5.0years 50hr