Allen-Bradley 1756-CNBR ControlNet Redundant Communication Bridge Module

Product Description

The Allen-Bradley 1756-CNBR is a high-reliability redundant ControlNet communication bridge module designed for Rockwell Automation's ControlLogix PLC platform, engineered specifically for mission-critical industrial automation applications requiring uninterrupted network connectivity. Building on the core functionality of the 1756-CNB, this module features dual redundant ControlNet ports, enhanced fault tolerance, and robust industrial-grade construction with galvanic isolation, advanced EMI/RFI shielding, and wide temperature tolerance to withstand harsh factory floor and process environments. Its compact rack-mount design integrates seamlessly with ControlLogix chassis, while plug-and-play functionality simplifies installation and configuration. The 1756-CNBR supports deterministic, real-time ControlNet communication with automatic failover between redundant network paths, making it an essential component for high-availability industrial control systems in sectors where network downtime would result in significant operational or safety risks.

Key Functions

The primary function of the 1756-CNBR module is to provide redundant, bidirectional, deterministic communication between ControlLogix PLC controllers and the ControlNet industrial network, supporting both I/O data exchange and peer-to-peer messaging with automatic failover capabilities. It features dual independent ControlNet ports for redundant network connectivity, enabling seamless switchover (≤3 ms) between primary and secondary network paths in the event of cable failure, port malfunction, or network disruption. The module supports ControlNet's producer/consumer communication model, enabling efficient data sharing across up to 99 network nodes (including remote I/O racks, other PLCs, HMIs, and SCADA systems) with low latency and high data integrity. It includes comprehensive built-in diagnostics for real-time monitoring of network status, link health, and communication errors, with detailed alarm reporting for proactive maintenance. Additionally, it supports configurable network parameters (5/10 Mbps baud rate, node address), complies with open ControlNet standards for third-party interoperability, and enables hot-swap replacement in redundant ControlLogix chassis configurations to eliminate system downtime during module maintenance.

Application Scenarios

The Allen-Bradley 1756-CNBR redundant ControlNet module is exclusively deployed in mission-critical industrial automation applications requiring maximum network availability across multiple sectors. In oil and gas refineries and petrochemical plants, it provides redundant ControlNet connectivity for ControlLogix systems controlling reactor processes, emergency shutdown (ESD) systems, and pipeline infrastructure, ensuring uninterrupted communication even during network component failures. In nuclear and thermal power generation facilities, it links ControlLogix controllers managing turbine systems, boiler controls, and safety systems to redundant ControlNet networks, meeting strict reliability requirements for power generation infrastructure. For pharmaceutical manufacturing, it connects batch process ControlLogix systems to redundant ControlNet networks to maintain compliance with GMP standards and prevent costly production interruptions. The module is also essential for water and wastewater treatment plants operating critical pump stations and water distribution systems, providing redundant network connectivity to avoid service disruptions. Additionally, it is used in automotive manufacturing for critical paint shop and assembly line control systems, in chemical manufacturing for hazardous process control systems, and in mining operations for remote control of extraction equipment where network downtime could pose safety risks or significant production losses.

Technical Specifications

Contact Information

• Sales Manager: KI MI
• WeChat: 18059884790
• WHATSAPP: +86 18059884790 (Click to add)
• Email: plc66@qq.com

Core Advantages

• 121 shared inventories worldwide, with direct procurement from overseas warehouses.
• Provide favorable prices and professional after-sales warranty services.
• All products are brand new and original; spare parts come with a one-year warranty and have been tested and certified.
• For orders of more than one product, contact us to get an exclusive discount.
• If other suppliers offer lower prices for the same products, we are willing to provide further discounts based on your budget.

Customer Distribution

Our customers are from: United States, Germany, Japan, South Korea, United Kingdom, France, Italy, Canada, Brazil, India, Australia, Russia, Spain, Netherlands, Switzerland, Sweden, Belgium, Austria, and Turkey.

Note

All product names, trademarks, brands, and logos used on this website are the property of their respective owners. The description, explanation, or sale of products bearing these names, trademarks, brands, and logos is for identification purposes only and does not imply any affiliation with or authorization from any rights holder.