Allen-Bradley 1794-ACNR | Flex I/O ControlNet Redundant Adapter

Product Overview

The Allen-Bradley 1794-ACNR is a Flex I/O communication adapter designed for high-availability industrial networks. It supports dual ControlNet ports, enabling redundant data highways for critical applications. The module integrates seamlessly with up to eight Flex I/O modules, enhancing system flexibility and network reliability.

Technical Specifications

The 1794-ACNR operates on a 24V DC power supply, with an input voltage range of 19.2–31.2V DC. It consumes a maximum of 400 mA and has a thermal dissipation of 15.7 BTU/hr at 19.2V DC. The module features flexbus output current up to 640 mA and provides isolation voltage of 850V DC.

It supports ControlNet V1.25 protocol with a communication rate of 5 Mbps, utilizing Belden RG-6/U cable for each port. Inrush current peaks at 23A for 2 milliseconds, while power dissipation remains below 4.6W.

Design and Environmental Conditions

The 1794-ACNR is DIN-rail mounted, ensuring compact and secure installation. It operates reliably in temperatures ranging from -20°C to +55°C, withstanding shock up to 30 g and vibration up to 5 g at 10–500 Hz. LEDs indicate communication status (Comm A and B) and I/O module status, providing immediate operational feedback.

Network and Connectivity

Each ControlNet port supports redundant connections, enabling high-availability networking. The module facilitates real-time data exchange between Flex I/O modules and controllers while maintaining integrity across critical automation systems. Its dual-port design allows seamless integration into existing ControlNet infrastructures.

Applications

The Allen-Bradley 1794-ACNR is ideal for industrial automation scenarios requiring high reliability, including:

• Redundant ControlNet communication for critical machinery.

• Integration of distributed Flex I/O modules into PLC systems.

• Industrial process monitoring and control with real-time data exchange.