User's Manual
EtherNet/IP
CJ2 CPU
Programmable Terminal
Host application
Data links
Message 
communications
FTP
CX-One
HUB
CJ2 CPU CJ1-EtherNet/IP Unit
Message 
communications
Data links
Transport 
Layer
Data Link 
Physical Layer
EtherNet/IP is an industrial network that uses the CIP real-time protocol in the EtherNet 
application layer. (Standards: EN 50170 and IEC 61158)
Application 
Layer
FTP HTTP  SMTP SNMP FINS
Network 
Layer
IP
ICMP IGMP
OSPF
IGRP
IEEE 802.3 EtherNet
CIP
TCP UDP
Real-time Data 
Links
Explicit 
Messages
ARP RARP
6
Networks Are More Open
EtherNet/IP is an open network that uses the TCP/IP protocol on EtherNet networks, which are widely used 
in offi ces and factories throughout the world. The CJ2 CPU Units support EtherNet/IP as a standard feature. 
Because EtherNet/IP uses TCP/IP, it provides the many advantages of EtherNet technology.
Universal EtherNet and FA Data Links Can Be Used at the Same Time.
With EtherNet/IP, One Port Is Enough.
FTP Communications, Data Links, and Support Software Can Be Used Simultaneously through
a Single Port. 
The CJ2 CPU Units provide as standard equipment a multifunctional EtherNet port that supports EtherNet/
IP. There is no need to add an EtherNet Unit, because universal EtherNet communications, such as data links 
between PAC’s, message communications between PAC’s, and FTP transfers, are all enabled simultaneously 
through this one port while Support Software is connected. 
Create a Seamless Data Flow in a Single Network System.
Because it is based on the world-standard CIP open protocol, a seamless data fl ow can be achieved between 
control lines and information monitoring lines in a single network system. From here on, EtherNet/IP will be 
increasingly used in multi-vendor environments (such as robotics and safety devices).
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