Power OFF Operation

Section 4-4

Power supply voltage

Power supply voltage

Power supply voltage

85% of the rated voltage or less

 

 

10 ms

25 ms

 

 

 

 

Time

0

 

 

 

 

 

 

 

 

0 to 10 ms

 

 

 

 

 

 

 

Momentary power

 

 

interruption not detected

 

 

and operation continues.

 

 

10 to 25 ms

25 ms

Operation will continue or stop depending on whether or not a momentary power interruption is detected.

Momentary power interruption detected and operation stops.

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

85% of rated voltage

Operation always stopped at this point regardless.

Power OFF detected signal

 

 

 

 

Holding time for 5 V internal

 

 

 

 

power supply after power

 

 

 

 

OFF detection: 10 ms.

 

Power OFF detected

Power OFF confirmed

 

 

 

 

 

 

Fixed Power OFF

 

User-set Power

 

Detection Time:

 

OFF Detection

 

Default is 10 to

 

Time: 0 to 10 ms

 

25 ms (Power OFF

 

(set in System

 

 

 

 

 

undetermined)

 

Setup)

 

 

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.

Program execution status

Cyclic task or interrupt tasks not associated with power OFF

 

Stopped

 

 

 

Reset signal

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.

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Omron FQM1-MMA21, FQM1-CM001 Power OFF Timing Chart, Fixed Power OFF Detection Time, User-set Power OFF Detection Time