Allen-Bradley 1756-EN2T ControlLogix EtherNet/IP Communication Bridge Module

Product Overview

The Allen-Bradley 1756-EN2T functions as a high-performance EtherNet/IP communication faceplate within the ControlLogix automation architecture. By facilitating high-speed, real-time data transmissions, this module bridges the gap between ControlLogix processors and external networks. Plant engineers utilize this interface to establish deterministic links across distributed I/O systems, human-machine interfaces (HMIs), supervisory control systems (SCADA), and co-operating controllers. Because the module utilizes the standard Common Industrial Protocol (CIP) over EtherNet/IP, it eliminates the need for proprietary bridging equipment while maintaining reliable communication channels.

Advanced Capabilities and Network Architecture

• High-Volume Connection CapacityTo accommodate complex, data-heavy automation environments, the module supports up to 256 Logix communication connections alongside 128 discrete TCP/IP connections. This dual-layer processing architecture allows the hardware to simultaneously transmit critical plant floor diagnostics and high-speed controller interlocking data without network degradation.
• Integrated Safety and Motion ManagementBeyond standard digital I/O orchestration, the unit incorporates full compatibility with CIP Safety protocols. Consequently, safety and standard control scripts can travel concurrently across a single network cable. Furthermore, the bridge provides the precise clock synchronization required to manage up to 8 axes of integrated motion control directly over the EtherNet/IP architecture.
• Industrial Resilience and Physical LayoutThe single-slot module seats directly into any standard ControlLogix chassis, drawing power straight from the backplane. It utilizes a standard RJ45 port compatible with cost-effective, unshielded Category 5 twisted-pair wiring. To optimize continuous uptime, electronic keying safeguards the slot against incorrect module replacements, while internal firmware supports device-level ring (DLR) topologies to maintain network operation in the event of a physical line break.

Technical Specifications

• Manufacturer: Allen-Bradley / Rockwell Automation
• System Platform: ControlLogix
• Catalog Number: 1756-EN2T
• Module Function: EtherNet/IP Bridge/Communication Module
• Transmission Velocity: 10/100 Mbps Fast Ethernet
• Backplane Current Draw: 1 A @ 5.1 V DC
• Thermal Output: 17.4 BTU/hour
• Environmental Operating Limits: 0 to 60 °C (32 to 140 °F)
• Relative Humidity Tolerance: 5% to 95% (non-condensing)
• Physical Dimensions: 3.5 cm x 14.0 cm x 14.5 cm
• Net Weight: 0.2 kg
• Harmonized Tariff Code (HS Code): 8537101190

Industrial Applications

• High-speed packaging lines requiring synchronized multi-axis motion profiling.
• Automated manufacturing systems implementing CIP Safety architectures to protect machinery operators.
• Distributed process control networks requiring widespread connection of remote I/O chassis to central processors.
• Industrial Internet of Things (IIoT) physical data aggregation layers linking field equipment to plant-wide databases.