1788-EN2DNR | Allen-Bradley EtherNet/IP to DeviceNet Linking Device with DLR Support

The 1788-EN2DNR is a linking device developed by Allen-Bradley that provides seamless communication between EtherNet/IP and DeviceNet networks. It acts as a protocol bridge, allowing EtherNet/IP controllers to exchange data with DeviceNet slave devices. This module is ideal for modernizing systems where DeviceNet field devices must remain but control logic migrates to newer EtherNet/IP platforms. It supports Device Level Ring (DLR) topologies to enhance fault tolerance and ensure network resiliency. Its design simplifies integration, minimizes controller load, and improves diagnostics through built-in web server functionality.

The 1788-EN2DNR operates on a 24V DC power supply and draws current sufficient to support both EtherNet/IP and DeviceNet communication. It uses separate connections for input power and DeviceNet power to allow flexible installation. Power wiring must follow correct wire gauge requirements (typically 0.25–2.5 mm² for power, and 0.52 mm² for DeviceNet). Proper electrical protection, such as fuses or circuit breakers, is recommended. The power supply should be stable and within the specified tolerance range to ensure reliable operation.

Yes, the 1788-EN2DNR is fully compatible with CompactLogix 5069-L306ER and other EtherNet/IP-enabled controllers. Communication is established over Ethernet using standard CIP messaging. The CompactLogix controller can scan the DeviceNet devices connected via the 1788-EN2DNR and map their data into the Logix memory. The integration is configured using Studio 5000, which provides tools for automatic device discovery and connection management. This setup allows modern controllers to continue operating with legacy DeviceNet devices without needing DeviceNet scanner cards.

DLR, or Device Level Ring, is a network topology that offers redundancy in EtherNet/IP systems, reducing downtime during cable or device failure. The 1788-EN2DNR fully supports DLR, enabling it to function in ring-based networks where fault tolerance is essential. If one path in the ring is broken, the network automatically re-routes communication, maintaining real-time data exchange. DLR is especially useful in safety-critical or 24/7 environments where uptime is a priority. The module's dual Ethernet ports are used to implement DLR without requiring additional switching hardware.

Yes, the 1788-EN2DNR is still being produced and actively supported by Rockwell Automation. It is part of the current catalog for DeviceNet linking solutions, especially for hybrid network environments. As industrial networks evolve, Rockwell continues to offer this module for cases where legacy DeviceNet systems must communicate with modern EtherNet/IP controllers. Availability is confirmed through Rockwell’s Product Lifecycle Status tool and authorized distributors. Long-term support ensures firmware updates, documentation access, and availability of spares.