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

Product Overview

The Allen-Bradley 1794-ACNR is a Flex I/O communication adapter. It mounts on a DIN rail and features dual ControlNet ports. These ports support redundant ControlNet data highway implementation. The adapter can handle up to eight Flex I/O modules. It uses a 24V DC external power supply. Power consumption is 400 mA maximum. The device operates at temperatures from -20 to 55 °C. It withstands shock up to 30 g and vibration up to 5 g. This adapter ensures reliable data exchange in demanding industrial environments.

Application Scenarios

The 1794-ACNR is ideal for redundant ControlNet networks. It connects Flex I/O modules to controllers with high availability. Typical applications include manufacturing lines, process control, and critical infrastructure. It works well in systems where network downtime is unacceptable. The dual-port design allows connection to two separate ControlNet trunks. This provides automatic failover if one network path fails. Up to eight I/O modules can be added, mixing discrete, analog, and specialty modules. This flexibility suits a wide range of automation tasks.

Technical Specifications

Data transfer speed is 5 Mbps per port. ControlNet protocol version is V 1.25. The adapter uses Belden RG-6/U cable with 12 AWG stranded wire. Isolation voltage is 850V DC. Maximum Flexbus output current is 640 mA at 5V DC. Power dissipation is 4.6W maximum at 19.2V DC. Thermal dissipation is 15.7 BTU/hr. Inrush current is 23A for 2 milliseconds. The enclosure is open type, requiring a proper cabinet. Dimensions are 3.7 x 3.6 x 3.4 inches. Weight is 0.37 kg. LED indicators include Comm A, Comm B, and I/O Status (red/green).

Installation & Maintenance Guide

Mount the adapter on a DIN rail in a suitable enclosure. Connect the external 24V DC power supply to the terminals. Ensure voltage is within 19.2 to 31.2V DC. Attach ControlNet cables to the two BNC ports. Use Belden RG-6/U cable for best performance. Install up to eight Flex I/O modules on the right side. Check LED indicators for proper communication and I/O status. Regular maintenance includes cleaning and verifying cable connections. Avoid exceeding the operating temperature range. Use only approved cables and power supplies.

Packing List

Each shipment includes one Allen-Bradley 1794-ACNR adapter module. A product manual is included in digital format. No cables or power supply are provided. The module is packaged in anti-static material. Shipping is done via FedEx, UPS, or DHL. Please verify the module for any damage upon receipt. For replacement parts, contact your supplier.