3 EtherNet/IP
3.1 System description
XI/ON: XNE-GWBR-2ETH-IP
09/2011 MN05002007Z-EN
www.eaton.com
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3.1.4
Addressing on EtherNet/IP
Ethernet MAC-ID
The Ethernet MAC-ID is a 6-byte-value which serves to uniquely identify an Ethernet device.
The MAC-ID is determined for each device by the IEEE (Institute of Electrical and Electronics
Engineers, New York).
The first 3 bytes of the MAC-ID contain a manufacturer identifier. The last 3 bytes can be
chosen freely by the manufacturer for each device and contain a unique serial number.
In addition to this, the MAC-ID can be read from the module using the software tool "I/O-
ASSISTANT".
IP address
Each Ethernet-host receives its own IP address. In addition, the node knows its netmask and
the IP address of the default gateway.
The IP address is a 4-byte-value which contains the address of the network to which the node
is connected as well as the host address in the network.
The IP address of the gateway XNE-GWBR-2ETH-IP is predefined as follows:
The netmask shows which part of the IP address defines the network as well as the network
class, and which part of the IP address defines the single node in the network.
In the example mentioned above, the first 3 bytes of the IP address define the network. They
contain the subnet-ID 192.168.1.
The last byte of the IP address defines the node’s address within the network.
IP address:
192.168.1.×××
netmask: 255.255.255.0
gateway:
192.168.1.001
Note
In order to build communication between a PC and an Ethernet-module, both have
to be nodes on the same network.
If necessary, the nodes’ network addresses have to be adapted one to another.
Please read Chapter 6.3 Changing the IP address of a PC/ network interface card,
Page 153.
