Mitsubishi Electric Q26UD(E)HCPU User Manual page 604

(2) Reduction measures of battery consumption
The following describes measures for reducing battery consumption.
• Enable the battery life-prolonging function.
• When storing a file register in standard the RAM, minimize the file register file.
• By performing the latch data backup function (to standard ROM), the battery life-prolonging function will be
enabled regardless of the parameter setting.
If not powering on the programmable controller for a long period of time for shipment or other reason, back
up the data to the standard ROM.
*4 Except when the battery life-prolonging function has already been enabled.
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*4