14-3
14 Troubleshooting
NJ-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
14-1 Overview of Errors
14
14-1-1 How to Check for Errors
This section describes the above checking methods.
z CPU Unit Operating Status
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.
*1 If you can connect communications to the CPU Unit from the Sysmac Studio with a direct USB connection, the
CPU Unit is in PROGRAM mode. If you cannot connect communications, the CPU Unit is being reset.
*3
*2 If you can connect communications to the CPU Unit from the Sysmac Studio with a direct USB connection, a
major fault level error has occurred. If you cannot connect communications, a watchdog timer error has
occurred in the CPU Unit.
*3
*3 If you cannot connect communications to the CPU Unit from the Sysmac Studio, it is also possible that the USB
cable is faulty or that the network type on the Sysmac Studio is not set for a direct USB connection. Refer to
the
NJ-series Troubleshooting Manual (Cat. No. W503) if you cannot connect communications to the CPU Unit.
Checking method What you can check
Checking the indicators You can check the error status of the CPU Unit and EtherNet/IP Function Mod-
ule.
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.
Checking with the Trouble-
shooter of an NS-series PT
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 communications sta-
tus with the Network Configura-
tor
You can check the communications status (e.g., tag data link connection status)
for each device on the EtherNet/IP network.
Checking the Indicators
Indicators
CPU Unit operating status
Error confirmation with the Sys-
mac Studio or an NS-series PT
PWR RUN ERROR
Not lit Not lit Not lit Power Supply Error Not possible: Refer to the NJ-series
Troubleshooting Manual (Cat. No.
W503).
Lit Not lit Not lit
CPU Unit Reset
*1
Lit Flashing Lit Incorrect Power Supply Unit Con-
nected
Lit Not lit Lit
CPU Unit Watchdog Timer Error
*2
Lit Not lit Lit Major fault level Possible: Connect the Sysmac Stu-
dio or an NS-series PT and check
the cause of and correction for the
error in the troubleshooting func-
tions of the Sysmac Studio or the
Troubleshooter of the NS-series PT.
Lit Lit Flashing
Partial fault level
*2
Lit Lit Flashing Minor fault level
Lit Lit Not lit Observation
Lit Lit Not lit Normal operation in RUN mode ---
Lit Not lit Not lit Normal operation in PROGRAM
mode
*1
---
Lit Flashing Not lit Normal operation in startup state ---
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