Omron HOME SECURITY SYSTEM - MOTION SENSOR FQM1-MMA21 - Manual (Page 123)

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Power OFF Operation Section 4-4
4-3-3 Operating Mode Changes and I/O Memory
Note (1) The cycle time will increase by approximately 10 ms when the operating
mode is changed from MONITOR to RUN mode. This will not cause an
error for exceeding the maximum cycle time limit.
(2) In Sync Mode, the Motion Control Module operating mode will change
one cycle after the Coordinator Module operating mode has changed.
4-4 Power OFF Operation
4-4-1 Power OFF Operation
The following processing is performed if FQM1 power is interrupted during
operation. The following power OFF processing will be performed if the power
supply falls below 85% of the minimum rated voltage while in RUN or MONI-
TOR mode.
1,2,3... 1. The Motion Control Modules and Coordinator Module will stop.
2. All outputs from all Modules will be turned OFF.
85% of the rated voltage (AC power):
85 V AC for 100 V
170 V AC for 200 V
85 V AC for 100 to 240 V (wide range)
The following processing will be performed if power drops only momentarily
(momentary power interruption).
1,2,3... 1. The system will continue to run unconditionally if the momentary power in-
terruption lasts less than 10 ms, i.e., the time it takes the minimum rated
voltage at 85% or less to return to 85% or higher is less than 10 ms.
2. A momentary power interruption that lasts more than 10 ms but less than
25 ms is difficult to determine and a power interruption may or may not be
detected.
3. The system will stop unconditionally if the momentary power interruption
lasts more than 25 ms.
It thus requires between 10 and 25 ms to detect a power interruption. This
time can be increased by setting the User-set Power OFF Detection Time (0
to 10 ms) in the System Setup.
Note The User-set Power OFF Detection Time appears in the System Setup simply
as the “Power OFF Detection Time.”
Mode Changes Cleared areas Retained areas
• I/O bits
• Data Link bits
• Work bits
• Timer PV • DM Area
• Counter PV
RUN or MONITOR to
PROGRAM Cleared (See note 1.) Retained
PROGRAM to RUN
or MONITOR Cleared (See note 1.) Retained
RUN to MONITOR or
MONITOR to RUN Retained (See note 2.) Retained