|
  V   XPF power failure sensor
__
  \___________________________________________________________________________
  v
  v
  |1 PLC time|writing EEPROM lo byte|1 PLC time|writing EEPROM hi byte|
  |2.5 ms max|       8 ms max       |2.5 ms max|       8 ms max       |
                                                                      v
                                                                      2 bytes are written

                                                                          |
Vdd                                                                       v  Power break down
___________________________________________________________________________
                                                                           \______