The Rockwell Automation 1756-EN3TR is a dual-port EtherNet/IP communication module designed for Allen-Bradley ControlLogix systems. It supports 10/100/1000 Mbps speeds, offers deterministic real-time communication, and includes embedded switch technology for simplified daisy-chaining. Key features include CIP Sync for motion control, QoS prioritization, and secure communication (IPsec, TLS). It is UL Class I, Div 2 certified for harsh environments.