26 Rockwell Automation Publication 1756-UM004D-EN-P - August 2022
Chapter 2 Connect to the EtherNet/IP Network
Redundant Adapter
Considerations Setting the
IP Address
The following are considerations when using two 1756-EN4TR modules as a
Redundant Adapter Pair.
• DHCP is not supported in Redundant Adapter Mode.
• Default Class C addresses like 192.168.1.x can be set using rotary switches
on the module in any mode.
• IP address assignments other than default Class C can only be set in non-
redundant adapter mode, where the switch is set to 8 or 9.
• Both 1756-EN4TR modules must be set to the same IP address before
switching to Redundant Adapter Mode, where the switch is set to 6 or 7.
• You must reserve an IP+1 address that is taken automatically by the
secondary.
For example, if the primary address is 192.168.1.1, the address 192.168.1.2
must be reserved.
To set the IP address for redundant adapters use the following steps.
1. Insert one module into the chassis in the standard mode (rotary mode
switch set to 8 or 9).
2. Set the IP address on the module.
3. Remove the module from the chassis.
4. Insert a second module into the chassis.
5. Set the same IP address on the second module as you set on the first
module.
6. Set the rotary mode switches to 6 or 7 on both modules to put the
modules in redundant adapter mode, and put the modules in slots 0 and
1.
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