Description

Allen‑Bradley 1756‑EN2TR Product Description

Technical Specifications

• Product Model: 1756-EN2TR
• Brand: Allen‑Bradley (Rockwell Automation)
• Warranty: One Year
• Input Voltage: 5.1VDC backplane power (1A rated draw), 24VDC auxiliary 3mA consumption
• Operating Temperature: 0°C to +60°C
• Storage Temperature: -40°C to +85°C
• Response Time: Deterministic microsecond-level EtherNet/IP cyclic I/O update
• Protection Class: IP20 (installation inside closed industrial control cabinets only)
• Accuracy Class: Bit error rate below 0.0001% for CIP industrial frame transmission
• Output Frequency: Auto-negotiable 10 Mbps / 100 Mbps twisted-pair Ethernet rate
• Rated Current Range: 0–1A maximum backplane current draw, total power dissipation 5.1W
• Communication Interface: Dual RJ45 copper Ethernet ports, USB local configuration port, ControlLogix chassis backplane connector
• Supported Protocols: EtherNet/IP, CIP, TCP/IP, DLR Device Level Ring topology protocol
• Overload Capacity: 980VAC isolation withstand between Ethernet, USB and chassis backplane for 60 seconds
• Dimensions: Single ControlLogix chassis slot, 120mm (H) × 35mm (W) × 110mm (D)
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Product Overview

The 1756-EN2TR is a dual-port EtherNet/IP communication bridge module designed exclusively for Rockwell Automation ControlLogix 5580/5380 and GuardLogix safety PLC chassis, serving as the core network gateway that links the rack controller to distributed I/O drives, HMI panels, SCADA hosts and motion control axes across industrial plant floors. This module supports up to 128 TCP connections and 256 CIP connections, and safely coordinates real-time cyclic data exchange for discrete control, process analog signals and synchronized multi-axis motion tasks with a maximum of 8 motion axes.

It resolves key pain points of single-port Ethernet communication architectures, including unprotected single cable failure causing full network outage, limited node scalability for large-scale production lines, insufficient bandwidth for high-speed motion control, and lack of built-in ring redundancy for critical continuous manufacturing processes. Native DLR (Device Level Ring) functionality automatically reroutes data within milliseconds if a network segment breaks, eliminating unplanned downtime for packaging, automotive assembly, water treatment and food & beverage automated lines. Isolation barriers separate the field Ethernet network from the controller backplane to block voltage surges and electromagnetic interference from variable frequency drives and heavy machinery.