Power Off Operation - Omron NSJ CONTROLLERS - 03-2008 Operation Manual

Power OFF Operation

7-1 Power OFF Operation
7-1-1 Power OFF Operation
1,2,3...
1,2,3...
118
The following processing will be performed if power to the NSJ Controller or
CJ-series Expansion Racks is interrupted. The following processing will be
performed if the power supply voltage drops to the power OFF detection volt-
age for a period of time while the Controller Section is operating in RUN or
MONITOR mode.
1. The Controller Section and CJ-series Expansion Racks will stop.
2. All outputs from Output Units will be turned OFF.
Note All outputs will turn OFF despite an I/O Memory Hold Bit or I/O Memory Hold
Bit at power ON settings in the PLC Setup.
If the power supply voltage drops only momentarily, operation may stop or it
may continue depending on the length of the momentary power interruption.
The times required to detect a power interruption and stop operation are given
in the following table.
Unit
NSJ Controller
AC Power 100 V AC
Supply
200 V AC
Unit
100 to 240 V AC
(wide range)
DC Power CJ1W-PD025
Supply
CJ1W-PD022
Unit
1. The system will continue to run unconditionally if the momentary power in-
terruption lasts less than the time given for A. Operation continues.
2. A momentary power interruption may or may not be detected for power in-
terruptions that lasts more than the time given for A. Operation continues
but less than the time give for B. Operation stops, i.e., this is an unknown
area that depends on the load on the power supply. (The NSJ Controller
itself does not have an unknown area.)
3. The system will stop unconditionally if the momentary power interruption
lasts more than the time give for B. Operation stops.
4. The Display Section may stop operating even for power interrupts of 2 ms
or less, but operation will recover after the power supply is restored.
Power OFF Momentary interrupt time
detection
A. Operation
voltage
continues.
20.4 V DC Less than 2 ms
85 V AC Less than 10 ms
170 V AC
85 V AC
19.2 V DC Less than 2 ms
21.6 VDC
Section 7-1
B. Operation
stops.
2 ms or longer
25 ms or longer
5 ms or longer
10 ms or longer