5 Troubleshooting
5-8
NJ-series CPU Unit Hardware User’s Manual (W500)
Use the following methods to check for non-fatal errors.
*1 Detailed information, such as error causes and corrections, is not displayed.
*2 To perform troubleshooting from an HMI, connect the HMI to the built-in EtherNet/IP port on the CPU Unit.
Refer to the appendices of the NJ/NX-series Troubleshooting Manual (Cat. No. W503) for the applicable range
of the HMI Troubleshooter.
This section describes the above checking methods.
Checking the Level of a Controller Error
You can use the PWR indicator on the Power Supply Unit and the RUN and ERROR indicators on
the CPU Unit to determine the event level for an error. The following table shows the relationship
between the Controller’s indicators and the event level.
Checking for Non-fatal Errors
Checking method What you can check
Checking the indicators You can use the indicators to confirm the Controller error level, the error status
of the EtherCAT Master Function Module, and the error status of the Ether-
Net/IP Function Module.
Checking with the trouble-
shooting function of Sysmac
Studio
You can check for current Controller errors, a log of past Controller errors, error
sources, error causes, and corrections. You can also check error logs from CJ-
series Special Units.
*1
Checking with the Trouble-
shooter of an HMI
*2
You can check for current Controller errors, a log of past Controller errors, error
sources, error causes, and corrections.
Checking with instructions that
read function module error sta-
tus
You can check the highest-level status and highest-level event code in the cur-
rent Controller errors.
Checking with system-defined
variables
You can check the current Controller error status for each function module.
Checking the Indicators
Indicator
Event level
PWR (green) RUN (green) ERROR (red)
Lit Not lit Lit Major fault level
Lit Lit Flashing (1-s intervals) Partial fault level
Minor fault level
Lit Lit Not lit Observation
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