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Chapter 5
Configure the Module for Your EtherNet/IP Network
28
IP Address
The IP address identifies each node on the IP network (or system of connected
networks). Each TCP/IP node on a network (including your module) must have
a unique IP address.
The IP address is 32 bits long and has a net ID part and a Host ID part.
Networks are classified A, B, C, (or other). The class of the network determines
how an IP address is formatted.
0
Class A
Net ID
0
0
Class B
1 0
0
Class C
1 1 0
You can distinguish the class of the IP address from the first integer in its
dotted-decimal IP address as follows:
Table 4 - Classes of IP Addresses
Range of first integer
0...127
128...191
Each node on the same logical network must have an IP address of the same
class and must have the same net ID. Each node on the same network must
have a different Host ID thus giving it a unique IP address.
IP addresses are written as four decimal integers (0...255) separated by periods
where each integer gives the value of one byte of the IP address.
EXAMPLE For example, the 32-bit IP address:
10000000 00000001 00000000 00000001 is written as 128.1.0.1.
Gateway Address
This section applies to multi-network systems. If you have a single network
system, go to the next section.
The gateway address is the default address of a network. It provides a single
domain name and point of entry to the site. Gateways connect individual
networks into a system of networks. When a node needs to communicate with
a node on another network, a gateway transfers the data between the two
networks.
Figure 6
Figure 6 - Connect Network 1 with Network 2
A
128.1.0.1
B
128.2.0.1
Rockwell Automation Publication 1732E-UM003D-EN-E - November 2021
7 8
15 16
Net ID
Net ID
Class
Range of first integer
A
192...223
B
224...255
shows gateway G connecting Network 1 with Network 2.
Network 1
G
C
128.2.0.2
Network 2
Host ID
Host ID
23
24
Host ID
Class
C
other
128.1.0.2
128.2.0.3
31
31
31
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