Allen-Bradley 1756-EN3TR EtherNet/IP Interface Module

The Allen-Bradley 1756-EN3TR EtherNet/IP Interface Module for ControlLogix is a two‑port Ethernet/IP interface that plugs into a ControlLogix chassis to bridge the backplane to 10/100 Mbps Ethernet networks. It provides two copper RJ45 ports for dual Ethernet connections and supports up to 128 TCP connections, enabling scalable, parallel communications with EtherNet/IP devices. The module is designed for backplane‑to‑network bridging with 30 V continuous isolation and basic insulation, and supports Ethernet‑to‑Backplane, USB‑to‑Backplane, and, where applicable to related EN series, USB‑to‑Ethernet connections. Common applications include integrating EtherNet/IP devices with a ControlLogix system, enabling remote I/O access and data exchange with field devices across industrial networks, and bridging between plant Ethernet networks and the PLC backplane on ControlLogix architectures. As part of Rockwell Automation’s ControlLogix I/O family, the EN3TR is used in a wide range of manufacturing and process environments to extend Ethernet/IP communications across a programmable logic controller system.