62 Rockwell Automation Publication 5069-UM002A-EN-P - January 2019
Chapter 2 Connect to the Controller
Duplicate IP Address Detection
The controller verifies that its IP address does not match any other network
device IP address when you perform either of the following tasks:
• Connect the controller to a EtherNet/IP network.
• Change the controller IP address.
If the controller IP address matches that of another device on the network, the
controller Ethernet port transitions to Conflict mode. In Conflict mode, the
following conditions exist:
• Network (NET) status indicator is solid red.
• The 4-character display indicates the conflict.
The display scrolls: <IP_address_of_this_module> Duplicate IP
<Mac_address_of_duplicate_node_detected>
For example: 192.168.1.1 Duplicate IP - 00:00:BC:02:34:B4
Duplicate IP Address Resolution
When two devices on a network have IP addresses that conflict, the resolution
depends on the conditions in which the duplication is detected. This table
describes how duplicate IP addresses are resolved.
Duplicate IP Address Detection Conditions Resolution Process
• Both devices support duplicate IP address detection.
• Second device is added to the network after the first
device is operating on the network.
1. The device that began operation first uses the IP address and continues to operate without interruption.
2. The device that begins operation second detects the duplication and enters Conflict mode.
To assign a new IP address to the controller and leave Conflict mode, see
Set the IP Address with the BOOTP-DHCP
EtherNet/IP Commissioning Tool on page 55.
• Both devices support duplicate IP address detection.
• Both devices were powered up at approximately the
same time.
Both EtherNet/IP devices enter Conflict mode.
To resolve this conflict, follow the following steps:
a. Assign a new IP address to the controller. For more information, see
Set the IP Address with the BOOTP-DHCP
EtherNet/IP Commissioning Tool on page 55.
b. Cycle power to the other device.
One device supports duplicate IP address detection and a
second device does not.
1. Regardless of which device obtained the IP address first, the device that does not support IP address detection uses
the IP address and continues to operate without interruption.
2. The device that supports duplicate IP address detection detects the duplication and enters Conflict mode.
To assign a new IP address to the controller and leave Conflict mode, see
Set the IP Address with the BOOTP-DHCP
EtherNet/IP Commissioning Tool on page 55.
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