Product Overview

The Allen-Bradley 1756-EN2TR is a high-capacity, dual-port EtherNet/IP communication interface engineered for the ControlLogix® platform. This module functions as a high-speed bridge, facilitating the exchange of real-time I/O data, motion control commands, and safety messages between the controller and the industrial network. By supporting the Common Industrial Protocol (CIP™), it enables seamless vertical integration from the plant floor to supervisory SCADA and HMI systems.

A defining feature of the 1756-EN2TR is its built-in switch technology, which supports Device Level Ring (DLR) topologies. This provides critical network redundancy; if a single point in the network ring fails, the module automatically reroutes data to maintain system uptime. It is also fully compatible with CIP Safety, allowing standard and safety-rated data to coexist on the same physical wire, which reduces wiring complexity and hardware costs in high-integrity automation environments.

Advanced Networking and Performance

The 1756-EN2TR is designed to handle the demanding data loads of modern, large-scale industrial architectures.

• Dual-Port Redundancy: Two RJ45 ports support Linear, Star, and DLR topologies, ensuring continuous communication during cable breaks or port failures.

• High Connection Capacity: Manages up to 256 CIP connections and 128 TCP/IP sessions, accommodating massive distributed I/O and peer-to-peer messaging.

• Integrated Motion Control: Supports Integrated Motion on EtherNet/IP, providing the deterministic performance required for high-precision multi-axis servo applications.

• Safety Integration: Rated for use in SIL 2 and SIL 3 applications when used in conjunction with GuardLogix® controllers and CIP Safety-compliant field devices.

• Rapid Deployment: Supports BOOTP/DHCP for automated IP address assignment and is fully configurable within the Studio 5000 Logix Designer® environment.

Technical Specifications

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Model Number: 1756-EN2TR

• Communication Rate: 10/100 Mbps (Full or Half Duplex)

• Ports: 2 x Ethernet RJ45

• Backplane Current: 1.0A @ 5.1V DC; 3mA @ 24V DC

• Power Dissipation: 5.1 Watts

• Thermal Dissipation: 17.4 BTU/hr

• Module Slot Width: 1 (Single-slot)

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Dimensions: 3.5 x 13.0 x 14.5 cm

• Weight: 0.9 kg (1.98 lbs)

System Compatibility and Use Cases

The 1756-EN2TR serves as a universal communication backbone in diverse industrial sectors:

• Distributed I/O Management: Efficiently controls Flex™ I/O, POINT I/O™, and remote ControlLogix chassis across an EtherNet/IP network.

• Motion and Drive Control: Synchronizing PowerFlex® drives and Kinetix® servo systems for high-speed packaging and material handling.

• SCADA/HMI Gateway: Providing high-throughput data access for FactoryTalk® View and third-party supervisory software.

• Industrial Redundancy: Acting as the primary communication link in ControlLogix Redundancy systems (L6x, L7x, and L8x series).