5 Troubleshooting
5-2
NJ-series CPU Unit Hardware User’s Manual (W500)
5-1 Operation after an Error
This section describes the error status of the NJ-series Controller and the operation that occurs after an
error is detected. Refer to 5-2 Troubleshooting for details on corrections for specific errors. Refer to the
NJ/NX-series Troubleshooting Manual (Cat. No. W503) for all of the errors that may occur in an NJ-
series Controller.
You can check the operating status of the CPU Unit with the PWR, RUN, and ERROR indicators on the
front panels of the Power Supply Unit and CPU Unit.
The following table shows the status of front-panel indicators, the status of user program execution, and
the ability to connect communications to the Sysmac Studio or an HMI during startup, during normal
operation, and when errors occur.
*1 Refer to 5-1-2 Fatal Errors in the CPU Unit for information on individual errors.
*2 Refer to 5-1-3 Non-fatal error in CPU Unit for information on individual errors.
*3 The function module where the error occurred stops.
5-1-1 Overview of NJ-series Status
CPU Unit operating status
Power
Supply
Unit
CPU Unit
User pro-
gram execu-
tion status
Communications
with Sysmac Stu-
dio or an HMI
PWR
(green)
RUN (green) ERROR (red)
Startup
Lit Flashing
(1-s intervals)
Not lit Stopped. Not possible.
Normal opera-
tion
RUN mode Lit Lit Not lit Continues. Possible.
PROGRAM mode Lit Not lit Not lit Stopped.
Fatal error in
CPU Unit
Power Supply
Error
*1
Not lit Not lit Not lit Stopped. Not possible.
CPU Unit Reset
*1
Lit Not lit Not lit Stopped.
Incorrect Power
Supply Unit Con-
nected
*1
Lit Flashing
(3-s intervals)
Lit Stopped.
CPU Unit Watch-
dog Timer Error
*1
Lit Not lit Lit Stopped.
Non-fatal error
in CPU Unit
Major fault
*2
Lit Not lit Lit Stopped. Possible. (Commu-
nications can be
connected from an
HMI if EtherNet/IP
is operating nor-
mally.)
Partial fault
*2
Lit Lit Flashing
(1-s intervals)
Continues.
*3
Minor fault
*2
Lit Lit Flashing
(1-s intervals)
Continues.
Observation
*2
Lit Lit Not lit Continues.
PWR
indicator
RUN
indicator
ERROR
indicator
Power Supply Unit CPU Unit
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