Description Of Operation - Omron CS1D DUPLEX SYSTEM - 10-2009 Operation Manual

Power OFF Operation
85% of the rated voltage or less
Power supply
voltage
Power supply
voltage
Power supply
voltage
Power OFF Timing Chart
85% of rated
voltage
Power OFF
detected signal
Program execution
status
CPU reset signal

Description of Operation

1,2,3...
10 ms
0
0 to 10 ms
Momentary power interruption
not detected and operation
continues.
Operation will continue or stop
depending on whether or not a
momentary power interruption
is detected.
Note The above timing chart shows an example when the power OFF detection
time is set to 0 ms (the default value).
The following timing chart shows the CPU Unit power OFF operation in more
detail.
Holding time for 5 V internal power
supply after power OFF detection:
10 ms.
Power OFF detected
Power OFF Detection
Default power OFF
Delay Time: 0 to 10 ms
detection time: 10 to
(set in PLC Setup)
25 ms
Cyclic tasks
Power OFF Detection Time
The time it takes to detect power OFF after the power supply falls below 85%
of the rated voltage.
Power OFF Detection Delay Time
The delay time after power OFF is detected until it is confirmed. This can be
set in the PLC Setup within a range from 0 to 10 ms. (The default is 0 ms.)
Power Holding Time
The maximum amount of time (fixed at 10 ms) that 5 V will be held internally
after power shuts OFF.
1. Power OFF will be detected if the 100 to 120 V AC or 200 to 240 V AC pow-
er supply falls below 85% of the rated voltage for the power OFF detection
time (somewhere between 10 to 25 ms).
25 ms
10 to 25 ms
Over 25 ms
Momentary power interruption
detected and operation stops.
Operation always stopped
at this point regardless.
Power OFF confirmed
Stopped
Section 9-3
Processing time after power
OFF is confirmed: 10 ms
minus Power OFF Detection
Delay Time
339