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6   Troubleshooting
CJ2 CPU Unit Hardware User’s Manual
6-2  Built-in EtherNet/IP Port Errors and Remedies
6
6-2-1  Checking Built-in EtherNet/IP Port Error Status
6-2 Built-in EtherNet/IP Port Errors and 
Remedies
Built-in EtherNet/IP port errors can be checked on the built-in EtherNet/IP port seven-segment display
on the front of the CPU Unit.
Precautions for Correct UsePrecautions for Correct Use
• For details on the types of errors related to the built-in EtherNet/IP port, and measures for han-
dling them, refer to the CS/CJ Series EtherNet/IP Units Operation Manual (Cat. No. W465).
6-2-1 Checking Built-in EtherNet/IP Port Error Status
Built-in EtherNet/IP port 
seven-segment display