168 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Chapter 6          Configure the Redundant I/O System
4. Click Change.
The Module Definition dialog box appears.
IMPORTANT
When using IP address swapping, the same IP address, subnet 
mask, and gateway address is assigned to both the partnered 
EtherNet/IP adapters. 
You cannot assign the backup module an IP address; it is 
automatically assigned the next highest IP address after the 
primary’s. The backup module of the pair, is assigned the primary’s, 
or active module’s, IP address, plus one.
For example, if you assign the IP address of 192.168.1.3 to the 
primary (active) module, after synchronization, the secondary 
EtherNet/IP adapter automatically is assigned IP address 
192.168.1.4.
Note: This graphic only is for illustrative purposes. In normal 
operation, the secondary adapter is not shown in the RSWho 
window.