Rockwell Automation Publication 1794-UM066C-EN-E - April 2023 19
Chapter 3 Configure the Adapter for Your EtherNet/IP Network
Subnet Mask
The subnet mask is used for splitting IP networks into a series of subgroups, or subnets. The mask
is a binary pattern that is matched up with the IP address to turn part of the Host ID address field
into a field for subnets.
T
2 bits of the Class B host ID have been used to extend the net ID. Each unique combination of bits in
the part of the Host ID where subnet mask bits are 1 specifies a different logical network.
The new configuration is:
A second network with Hosts D and E was added. Gateway G2 connects Network 2.1 with
Network 2.2.
Hosts D and E use Gateway G2 to communicate with hosts not on Network 2.2.
Hosts B and C use Gateway G to communicate with hosts not on Network 2.1.
When B is communicating with D, G (the configured gateway for B) routes the data from B to D
through G2.
Other Methods to Set the
IP Address
The FLEX I/O adapters support the following additional methods to change the IP address:
•BOOTP/DHCP tool
• RSLinx Classic software
For more information on how to use these methods, see EtherNet/IP Network Devices User Manual,
publication ENET-UM00
6.
EXAMPLE Take Network 2 (a Class B network) in the previous example and add
another network. Selecting the following subnet mask would add two
additional net ID bits, allowing for four logical networks:
11111111 11111111
11
000000 00000001 = 255.255.192.0
These 2 bits of the host ID used to extend the net
ID
Network 1
Network 2.1
Network 2.2
128.1.0.1
128.1.0.2
128.2.128.3
A
B
C
G
D E
G2
128.2.64.3
128.2.128.3
128.2.128.3
128.2.128.3
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