Allen-Bradley 1756-EN2T EtherNet/IP Communication Module
The Allen-Bradley 1756-EN2T is a high-performance EtherNet/IP communication module designed for the ControlLogix platform. This module serves as a bridge between ControlLogix controllers and EtherNet/IP networks, enabling high-speed data exchange, real-time control, and seamless integration with a wide range of industrial devices. Its advanced features support both information and control traffic within a single network infrastructure.
Dual-Port Ethernet Connectivity
One of the defining features of the 1756-EN2T is its dual Ethernet ports, which incorporate an integrated switch. This design allows for the creation of device-level ring (DLR) topologies, providing network redundancy and fault tolerance critical for continuous operations. The dual ports also enable daisy-chaining of devices, reducing the need for external switches and simplifying cabling in control cabinets. Each port supports 10/100 Mbps speeds with auto-negotiation for flexible integration.
High-Performance Data Exchange
The module is optimized for high-throughput communication, supporting both implicit (real-time I/O) and explicit (messaging) connections. It can handle a large number of connections simultaneously, making it suitable for applications with extensive I/O networks and numerous HMI or SCADA clients. The 1756-EN2T delivers low latency for control data while maintaining consistent performance under heavy network loads, ensuring deterministic behavior for time-critical processes.
Integrated Web Server and Diagnostics
Embedded within the module is a web server that provides access to diagnostic information, network statistics, and configuration details via a standard web browser. This feature simplifies troubleshooting and network management without requiring specialized software. Real-time status indicators on the front panel offer immediate visual feedback on module health, network activity, and communication status, aiding in rapid system assessment.
Seamless ControlLogix Integration
Designed as a native module for the ControlLogix chassis, the 1756-EN2T installs directly into the backplane and is automatically recognized by the system. Configuration is performed through Rockwell Automation’s Studio 5000 environment, allowing for straightforward assignment of IP addresses, connection management, and tag-based data sharing. The module supports producer-consumer technology, enabling efficient data exchange between controllers and devices without requiring additional logic.
Application Versatility
The 1756-EN2T is suitable for a wide range of industrial applications, from discrete manufacturing to process control. It supports connectivity to EtherNet/IP drives, I/O blocks, vision systems, and operator interfaces. The module’s ability to handle both real-time control data and enterprise-level information makes it a key component in modern connected factories and Industrial Internet of Things (IIoT) architectures.
