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MELSEC-Q
10 MAINTENANCE AND INSPECTION
(b) CPU module whose serial number's first 5 digits are "04011" or earlier
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
Q2MEM-2MBS
100% 11784hr 13872hr 8hr
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%.)
2: The manufacturing control number is given on the SRAM card rear label (see
below).
CAUTION
Do not subject to mechanical shock!
Do not expose to extreme temperrature,
Manufacturing control number
POINT
Remember that the SRAM card consumes battery power even when the battery is
connected to the CPU module and the power is turned ON.
If the special relay SM51 (battery low latch) turns on, immediately replace the battery.
If an alarm has not yet occurred, it is recommended to replace the battery periodically
according to the conditions of use.