24 Rockwell Automation Publication 1756-UM004D-EN-P - August 2022
Chapter 2 Connect to the EtherNet/IP Network
Set the IP Address with
Rotary Switches
This graphic shows the rotary switches on a 1756 EtherNet/IP communication
module. The three rotary switches at the bottom of the module, labeled X, Y,
and Z, can be used for setting the IP address. If the rotary switches are not set
to a valid number, the module attempts to use the BOOTP/DHCP server to set
the IP address.
At power-up, the module reads the rotary switches to determine if they are set
to a valid number for the last portion of the IP address. Valid numbers range
from 001…254.
If the settings are a valid number, these conditions result:
• IP address = 192.168.1.xxx (where xxx represents the switch settings)
• Subnet mask = 255.255.255.0
• Gateway address = 192.168.1.1
• The module does not have a host name that is assigned to it, nor does it
use any Domain Name System
We recommend that you set the rotary switches to a valid number before
installing the module.
Some modules now provide a gateway address of 0.0.0.0 when the network
address is set with rotary switches.
IMPORTANT For more information on how to use the BOOTP/DHCP server to set the IP
address, see EtherNet/IP Network Configuration Manual,
publication ENET-UM006
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