Operation After An Error; Overview Of Nj-Series Status - Omron NJ501-1400 User Manual

5 Troubleshooting
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.
5-1-1

Overview of NJ-series Status

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.
Power Supply 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.
CPU Unit operating status
Startup
RUN mode
Normal opera-
tion
PROGRAM mode
Power Supply
*1
Error
CPU Unit Reset
Fatal error in
Incorrect Power
CPU Unit
Supply Unit Con-
*1
nected
CPU Unit Watch-
dog Timer Error
Major fault
Partial fault
Non-fatal error
in CPU Unit
Minor fault
Observation
*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.
5-2
PWR
indicator
Power
Supply
Unit
PWR
RUN (green)
(green)
Lit Flashing
(1-s intervals)
Lit Lit
Lit Not lit
Not lit Not lit
*1 Lit Not lit
Lit Flashing
(3-s intervals)
Lit Not lit
*1
Lit Not lit
*2
Lit Lit
*2
Lit Lit
*2
Lit Lit
*2
CPU Unit
RUN
indicator
ERROR
indicator
CPU Unit
User pro-
gram execu-
tion status
ERROR (red)
Not lit Stopped.
Not lit Continues.
Not lit Stopped.
Not lit Stopped.
Not lit Stopped.
Lit Stopped.
Lit Stopped.
Lit Stopped.
Flashing
Continues.
(1-s intervals)
Flashing Continues.
(1-s intervals)
Not lit Continues.
NJ-series CPU Unit Hardware User's Manual (W500)
Communications
with Sysmac Stu-
dio or an HMI
Not possible.
Possible.
Not possible.
Possible. (Commu-
nications can be
*3
connected from an
HMI if EtherNet/IP
is operating nor-
mally.)