Description

The Allen-Bradley 1756-EN2TRXT is a high-performance EtherNet/IP bridge module designed for the ControlLogix-XT (Extreme Environment) series. This module provides reliable network connectivity in harsh industrial settings, including locations prone to high humidity, caustic gases, salt spray, and extreme temperature fluctuations. By utilizing dual-port embedded switch technology, it supports advanced network topologies such as linear and Device Level Ring (DLR) without the need for additional external hardware. The module integrates seamlessly with the ControlLogix backplane to manage I/O messaging, diagnostic data, and safety-related communications over a unified EtherNet/IP infrastructure.

Features

• Ruggedized Design: Engineered to meet ANSI/ISA-71.04-1985 Class G3 requirements for protection against atmospheric corrosives.
• Embedded Switch: Features two RJ45 ports for flexible star, linear, or DLR network configurations, enabling rapid recovery in ring topologies.
• High-Speed Configuration: Includes a dedicated USB 1.1 port for local diagnostics and initial module setup.
• Expanded Temperature Range: Certified for operation in environments ranging from -25 degC to 70 degC.
• High Capacity: Supports up to 256 CIP connections and 128 TCP/IP connections for complex control architectures.

Technical Specifications

Installation Guidelines

• Ensure the ControlLogix-XT chassis is properly grounded before installing the module.
• Power down the chassis backplane before inserting or removing the 1756-EN2TRXT to prevent electrical arcing or damage to the backplane pins.
• Use shielded Category 5 or higher Ethernet cabling to maintain signal integrity in high-EMI industrial environments.
• Maintain adequate clearance around the module to ensure proper airflow and heat dissipation, especially when operating at the upper limits of the temperature range.
• Handle the module using standard ESD (Electrostatic Discharge) protection practices to prevent damage to sensitive internal circuitry.

FAQ

What is the primary advantage of the -XT designation?

The -XT designation indicates that the module is specifically built for extreme environments. It features conformal coating and specialized components that provide enhanced resistance to humidity, corrosive gases, salt spray, and extreme temperatures that would typically degrade standard industrial modules.

Can this module be used in a standard ControlLogix chassis?

Yes, the 1756-EN2TRXT is compatible with standard ControlLogix chassis, though it is designed to complement the ruggedized ControlLogix-XT system. It occupies a single slot in any standard ControlLogix backplane.