Omron HOME SECURITY SYSTEM - MOTION SENSOR FQM1-MMA21 - Manual (Page 124)

101
Power OFF Operation Section 4-4
Note The above timing chart shows an example when the User-set Power OFF
Detection Time is set to 0 ms.
The following timing chart shows the Coordinator Module power OFF opera-
tion in more detail.
Power OFF Timing Chart
Fixed Power OFF Detection Time
The time it takes to detect power OFF after the power supply falls below 85%
of the minimum rated voltage.
User-set Power OFF Detection Time
The time after power OFF is detected until it is confirmed. This can be set in
the System Setup within a range from 0 to 10 ms (default: 0 ms).
If an unstable power supply is causing power interruptions, set a longer User-
set Power OFF Detection Time (10 ms max.) in the System Setup.
Power Holding Time
The maximum amount of time (fixed at 10 ms) that 5 V will be held internally
after power interruption is detected.
10 ms
25 ms
25 ms
0
0 to 10 ms
Time
10 to 25 ms
Power supply
voltage
Power supply
voltage
Power supply
voltage
Momentary power
interruption not detected
and operation continues.
85% of the rated voltage or less
Operation will continue or stop
depending on whether or not a
momentary power interruption
is detected.
Momentary power
interruption detected
and operation stops.
Reset signal
Stopped
Fixed Power OFF
Detection Time:
Default is 10 to
25 ms (Power OFF
undetermined)
Holding time for 5 V internal
power supply after power
OFF detection: 10 ms.
Power OFF detected Power OFF confirmed
User-set Power
OFF Detection
Time: 0 to 10 ms
(set in System
Setup)
Operation always stopped at this
point regardless.
Processing time after
power OFF is confirmed:
10 ms minus User-set
Power OFF Detection
Time
Note: The interrupt task
execution time must be
less than or equal to pro-
cessing time after power
OFF is confirmed.
85% of rated
voltage
Power OFF
detected signal
Program execution
status
Cyclic task or interrupt tasks not associated with power OFF