In the case of the FP-X series, the C-type plus battery can save all DTs, but it needs to be set in the programming software. If you do not add the battery type C and L type (L type can not be added to the battery) can be maintained: counter 16 points (C1008-C1023), internal relay 8 points (WR248-WR255), data register 55 words (C14: DT12230- DT12284, C30/C40/C60: DT32710-DT32764).
If it is a FP0 series, DT is saved as the last 8 words.
For the FP0R series, the backup areas of C10, C14, and C16 are: C1008~1023 (C contact, EV process value), R2480~255F, DT12000~12314. The backup areas of C32 and T32 are: C1008~1023 (C contact, EV process value), R2480~255F, DT32450~32764.