4-5
4 Installation and Wiring
NJ-series CPU Unit Hardware User’s Manual (W500)
4-1 Processing at Power ON and Power OFF
4
4-1-3 Resetting the Controller from the Sysmac Studio
Execution of the user program will continue if a momentary power interruption is less than the following
times.
After a power interruption is confirmed, the CPU Unit performs the following processing and then stops.
You can reset the CPU Unit from the Sysmac Studio.
A reset from the Sysmac Studio performs the same operation as cycling the power supply of the Power
Supply Unit. Resetting is possible, however, only when the CPU Unit is in PROGRAM mode.
Confirm the following status before resetting the CPU Unit.
• Check the status of output loads.
• Make sure that SD Memory Card access is not in progress.
Momentary Power Interruption with Continued Operation
Power supply type Momentary power interruption time with continued operation
AC power supply 30.5 ms max.
DC power supply 22.5 ms max.
Processing after Power Interruption Is Confirmed
Item Description
I/O refresh Load outputs are turned OFF. Tag data links stop.
Processing
SD Memory Card
access in progress
Any writing is interrupted, files are closed, and the Card is
unmounted.
Transferring user pro-
gram (including online
editing)
Interrupted. As a result, an error will occur the next time that the
power is turned ON. The Controller will not operate.
User program execu-
tion
User program execution is aborted even during execution of an
instruction.
Saving event log
The time that a power interruption occurs and the cause (primary
power interruption of Power Supply Unit) of the interruption are
recorded.
4-1-3 Resetting the Controller from the Sysmac Studio
The CPU Unit will not interrupt
execution of user program.
Momentary power interruption time from
voltage drop until recovery
Voltage drop
Power interruption
detected.
Executing user program
AC: 85 V max.
DC: 19.2 V max.
Power OFF detection time
AC: 30.5 to 45.5 ms
DC: 22.5 to 25.5 ms
Power interruption detection time
AC: 10 to 25 ms
DC: 2 to 5 ms
Power interruption detection delay time:
20.5 ms (fixed)
Voltage recovery
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