1756-EN2TR | Allen-Bradley ControlLogix EtherNet/IP Dual-Port Communication Module

Product Overview

The Allen-Bradley 1756-EN2TR functions as a high-performance communication interface for the ControlLogix platform. This dual-port EtherNet/IP module enables real-time data exchange between controllers, I/O devices, and HMI systems. It supports high-speed industrial networking protocols and provides the necessary bandwidth for complex, distributed automation architectures. We supply this module as 100% Brand New and Original, ensuring your critical control system operates with factory-certified networking stability.

Technical Specifications

The 1756-EN2TR manages high-volume data traffic while maintaining low thermal overhead within the ControlLogix chassis.

• Manufacturer: Allen-Bradley / Rockwell Automation

• Product Line: ControlLogix

• Module Type: EtherNet/IP Communication (Dual-Port)

• TCP Connections: 128 Maximum

• I/O Packet Rate: 25,000 Packets per second

• HMI/MSG Packet Rate: 2,000 Packets per second

• Ethernet Speed: 10/100 Mbps (Auto-negotiation)

• Backplane Current Draw: 1 Amp @ 5.1V DC; 3 mA @ 24V DC

• Power Dissipation: 5.1 Watts

• Thermal Dissipation: 17.4 BTU per Hour

• Socket Services: Supported

Engineering Advantages

• Native Device Level Ring (DLR) Support: The dual-port design allows the module to act as a node in a Device Level Ring topology. This architecture ensures network resiliency; if a single cable fault occurs, the ring automatically redirects traffic in milliseconds, preventing system downtime.

• High-Density Connectivity: This module supports up to 128 simultaneous TCP connections. It easily manages large-scale deployments involving numerous HMI stations, remote I/O racks, and peer-to-peer controller communications without performance degradation.

• Optimized I/O Throughput: The 1756-EN2TR handles an I/O packet rate of 25,000 packets per second. This capacity solves bottleneck issues in high-speed motion control or complex manufacturing lines where rapid data refresh rates remain critical.

• Simplified Troubleshooting and Maintenance: Integrated web-based diagnostics and port status LEDs provide immediate feedback on network health. Maintenance teams can identify port-specific errors or cabling issues at a glance, reducing Mean Time to Repair (MTTR).

FAQs

• Does the 1756-EN2TR require a specific slot in the ControlLogix chassis?

  No. You can install the 1756-EN2TR in any available slot in a 1756 I/O chassis. However, ensure your power supply provides sufficient 5.1V current (1 Amp) to support this module along with other installed cards.

• What is the advantage of the "TR" version over a standard "EN2T"?

  The "TR" (Two-port/Ring) designation indicates the presence of two RJ45 ports and an integrated switch. Unlike the single-port EN2T, the EN2TR supports DLR topologies and daisy-chaining, which significantly reduces the need for external Ethernet switches in the field.

• Can I use the 1756-EN2TR for messaging to third-party devices?

  Yes. The module supports Socket Services, allowing you to establish custom Ethernet communications with non-Rockwell devices such as barcode scanners, printers, or vision systems using standard TCP/UDP protocols.

• Is this module a direct replacement for older 1756-ENBT modules?

  Yes. The 1756-EN2TR offers significantly higher connection capacity and packet rates than the legacy 1756-ENBT. When replacing an ENBT, you may need to update the I/O configuration in Studio 5000 to match the new hardware's capabilities.