1 Introduction
1-10
NJ-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
z NET RUN, NET ERR, and LINK/ACT
• NET RUN indicator: This shows the status of the CIP connection (tag data links, Class 3 mes-
sages).
• NET ERR indicator: This shows the network communications error status. Refer to Section 14
Troubleshooting and Error Processing for details.
• LINK/ACT indicator: This shows the Ethernet communications status.
Indicators (LEDs)
Indicator Color Status Operating status
NET RUN
--- Not lit
Ethernet communications are not possible.
• The power supply is OFF or the Controller is being reset.
• A MAC address error or communications Controller error
occurred.
Green
Flashing
Ethernet communications are in progress.
• Tag data link connection establishment in progress (origina-
tor operation)
• IP address acquisition with BOOTP in progress.
Lit
Normal
If only the target is set for the tag data link, this indicator lights
regardless of whether the connection from the originator is
established. It remains lit even if the data links are stopped.
NET ERR
--- Not lit
There are no Ethernet communications errors.
• The power supply is OFF or was reset.
Red
Flashing
A user-recoverable error occurred.
• An error occurred in TCP/IP communications or CIP com-
munications.
• FTP Server Setting Error, NTP Server Setting Error, etc.
• Tag Data Link Setting Error, Tag Data Link Verification Error,
etc.
Lit
A user-non-recoverable error occurred.
• A MAC address error or communications Controller error
occurred.
LINK/ACT
--- Not lit
Link not established.
• The cable is not connected.
• The power supply is OFF or was reset.
Yellow
Flashing Data communications in progress after establishing link.
Lit Links established.
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