Mitsubishi Electric Q26UD(E)HCPU User Manual page 622

*1 For the battery consumption, refer to
*2 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%.)
*3 The guaranteed value represents a battery life at 70°C, which is calculated based on the characteristic values of
manufacturer-supplied memory (SRAM) and on the assumption of storage ambient temperature range of -25 to 75°C
(operating ambient temperature of 0 to 55°C).
*4 The actual service value (reference value) represents a battery life that is calculated based on the values measured at
storage ambient temperature of 40°C. This value is intended for reference only, as it varies with characteristics of the
memory.
*5 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.
● Use the battery within the time shown by the guaranteed value of the battery life.
● If the battery may be used exceeding the time shown by the guaranteed battery life value, perform the following.
• Perform boot operation to protect a program even if the battery dies at the programmable controller power-off.
• Back up programs and data After SM52 turned on (within the backup power time after an alarm).
● When the battery (Q6BAT, Q7BAT, and Q8BAT) is not connected to the CPU module, its service life is five years.
● When the battery-low special relay SM52 turned on, immediately change the battery.
Even if an alarm has not yet occurred, it is recommended to replace the battery periodically according to the operating
condition.
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Page 600, Appendix 4.