FX3U-32BL can be used. The battery is not included with the CPU module during factory shipment. The battery can be used to increase the capacity of the latch device/label, as well as to maintain the clock data during power interruption.
The latch range can be set arbitrarily by the customer. The settings can be found in the memory/device settings of CPU parameters. To back up the link register (W) and file register (R) devices, a battery FX3U-32BL (option) is required.