Operation at Power OFF
Execution of the user program is ended if a power interruption exceeds the time shown in the table
below. The processing after power interruption confirmation (described below) is performed, and then
the system (i.e., CPU Unit) stops.
Voltage drop
Power interruption confirmed.
System stops.
(CPU Unit stops.)
Executing user program
Power OFF detection time
*1
Processing after power interruption is confirmed.
System reset
DC: 20.4 V max.
*1. The power OFF detection time is 2 to 4 ms.
As shown in the following figure, the system (i.e. CPU Unit) will stop even if the voltage recovers after
the power interruption detection time.
Voltage drop
DC: 20.4 V max.
Power
interruption
confirmed.
System stops.
(CPU Unit stops.)
Voltage
recovery
System reset Executing user program
Power OFF detection time
*1
Processing after power interruption is confirmed.
*1. The power OFF detection time is 2 to 4 ms.
After stopping, the system will restart if the power supply remains recovery.
The table below defines the time that is used in the above two figures.
Item Description
Power OFF de-
tection time
The time from when the power supply voltage drops until the CPU Unit starts processing af-
ter the power interruption is confirmed. The CPU Unit continues to operate normally until the
power interruption is confirmed.
Momentary Power Interruption with Continued Operation
Execution of the user program will continue if a momentary power interruption is less than the follow-
ing times.
5 Installation and Wiring
5-4
NX-series NX502 CPU Unit Hardware User's Manual (W629)
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