Omron HOME SECURITY SYSTEM - MOTION SENSOR FQM1-MMA21 - Manual (Page 125)

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Power OFF Operation Section 4-4
Description of Operation
Power OFF will be detected if the 100 to 240 V AC power supply stays below
85% of the minimum rated voltage for the Fixed Power OFF Detection Time
(variable between 10 to 25 ms.)
If the User-set Power OFF Detection Time is set (0 to 10 ms) in the System
Setup, the reset signal will turn ON and the Module will be reset immediately
after the User-set Power OFF Detection Time expires.
4-4-2 Instruction Execution for Power Interruptions
If power is interrupted and the interruption is confirmed when the Coordinator
Module or Motion Control Module is operating in RUN or MONITOR mode, the
instruction currently being executed will be completed and then the Module
will be reset.