Allen-Bradley 1756-EN2TK ControlLogix EtherNet/IP Bridge Module

Technical Specifications

Main Features and Advantages

The Allen-Bradley 1756-EN2TK​ delivers a combination of network performance and ruggedness that is essential for modern industrial control. A primary advantage is its high connection density, supporting up to 128 TCP/IP connections and 256 Logix connections. This high capacity allows a single 1756-EN2TK​ module to serve as the communication hub for extensive distributed I/O systems, multiple HMIs, and data exchange with supervisory systems without becoming a bottleneck. The module’s efficient handling of both I/O data (producer/consumer tags) and explicit messaging ensures deterministic performance for control tasks while facilitating non-real-time data collection.Harsh environment protection is a defining characteristic of this model. The conformal coating applied to the 1756-EN2TK‘s circuitry provides a critical defense against conductive dust, moisture, and corrosive gases commonly found in industries like pulp and paper, chemical processing, and wastewater treatment. This protection helps prevent circuit degradation and premature failure, extending the module’s service life and reducing maintenance costs in challenging installations. Furthermore, the module integrates seamlessly into the Studio 5000 Logix Designer environment, allowing for straightforward configuration, firmware management, and comprehensive diagnostic monitoring through status LEDs and software-based health checks, simplifying system integration and troubleshooting.

Application Field

The Allen-Bradley 1756-EN2TK​ is widely deployed in industries that demand both robust networking and equipment durability. In process industries such as oil and gas, chemical, and pharmaceutical manufacturing, the module is used to connect ControlLogix PACs to remote I/O racks and process instrumentation over EtherNet/IP. The conformal coating of the 1756-EN2TK​ is particularly valuable in these settings, protecting against corrosive atmospheres and ensuring reliable operation in critical continuous processes where unplanned downtime is costly.In heavy manufacturing, including automotive assembly and metals production, the Allen-Bradley 1756-EN2TK​ facilitates high-speed machine-to-machine communication and serves as the backbone for integrated motion control systems. It enables precise synchronization of drives and robots over the Ethernet network. Additionally, the module is a common choice for infrastructure applications like water and wastewater treatment plants, where high humidity and environmental contaminants are prevalent. Here, the 1756-EN2TK​ reliably bridges control data between the central SCADA system and field-based PLCs or RTUs, ensuring stable operation of pumping, filtration, and treatment processes.