3 EtherNet/IP
3.1 System description
24
XI/ON: XNE-GWBR-2ETH-IP
09/2011 MN05002007Z-EN
www.eaton.com
3.1.2
TCP (Transmission Control Protocol)
The Transmission Control Protocol (TCP) is a connection-oriented transport protocol and is
based on the Internet Protocol. A safe and error-free data transport can be guaranteed by
means of certain error diagnostic mechanisms. For example, the acknowledgement and time
monitoring of telegrams.
UDP/IP (User Datagram Protocol)
UDP/IP provides the fast, efficient data transport necessary for real-time data exchange. To
make EtherNet/IP successful, CIP has been added on top of TCP/UDP/IP to provide a common
application layer.
3.1.3
Network-topology
EtherNet/IP network uses an active star topology in which groups of devices are connected
point-to-point to a switch.
Products with both transmission speeds (10 and 100 Mbit/s) can be used in the same network
and most Ethernet switches will negotiate the speed automatically.
Transmission media
For communication via Ethernet, different transmission media can be used:
• coaxial cable (10Base5)
• optical fibre (10BaseF)
• twisted two-wire cable (10BaseT) with shielding (STP) or without shielding (UTP)
Figure 15:
EtherNet/IP in
OSI 7 layer mod-
el
Semi
Devices
Pneu
Valve
AC
Drives
Position
Controllers
Other
Profiles
Application Layer
Explicit, I/O, Routing
UDP
DeviceNet
DLL
Transport
ControlNet
DLL
Transport
tbd
tbd
Encapsulation
TCP
IP
DeviceNet
physical
layer
Ethernet
physical
layer
ControlNet
physical
layer
ATM, Firewire,
USB, Blue Tooth
Application Object Library
User
Layer
Application
Layer
Transport
and Data
Link Layer
Physical
Layer
Ethernet/IP
