Mitsubishi Q01CPU User Manual page 299

11
MAINTENANCE AND INSPECTION
* 1: The power-on time ratio indicates the ratio of programmable controller 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%.)
* 2: The guaranteed battery service life; 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
to 55 ).
* 3: The actual battery service life; equivalent to the total power failure time that is calculated based on
the measured value and under the storage ambient temperature of 40
for reference only, as it varies with characteristics of the memory.
* 4: In the following status, the backup time after power OFF is 3 minutes.
•The battery connector is disconnected.
•The lead wire of the battery is broken.
* 5: For the High Performance model QCPU, these values are applicable when the first 5 digits of the
serial number of the CPU module is "05011" or higher.
For the battery life of the CPU module with a serial number of the first 5 digits "05010" or less,
refer to Appendix 2.3.
POINT
1. Do not use the battery exceeding its guaranteed life.
2. When the battery hours (total power failure time) may exceed its guaranteed
value, take the following measure.
• Perform ROM operation to protect a program even if the battery dies at
the programmable controller power-OFF.
• Back up programs and data after SM52 turns on (within the backup time
after alarm occurrence).
3. When the battery (Q6BAT, Q7BAT and Q8BAT) is not connected to the CPU
module, its service life is five years.
4. When the battery-low special relay SM52 turns on, immediately change the
battery.
Even if the alarm has not yet occurred, it is recommended to replace the
battery periodically according to the operating condition.
11.3 Battery Life and Replacement Procedure
11.3.2 Battery lives of CPU modules
(operating ambient temperature of 0
. This value is intended
11
- 11
9
10
11
12