Allen-Bradley | 1756-CNBR | ControlLogix

Product Description: Allen-Bradley 1756-CNBR

The Allen-Bradley 1756-CNBR is a ControlNet communication module with redundant media support, designed for use within ControlLogix systems. It allows for high-speed, deterministic communication between controllers and distributed devices over ControlNet networks. The module supports scheduled and unscheduled messaging and enables redundant media for increased system reliability.

Key Features

• Dual BNC connectors for redundant ControlNet media support
• Supports both scheduled (real-time) and unscheduled messaging
• Allows controller-to-controller and controller-to-I/O communication
• Enables communication with ControlNet-based HMI, drives, and I/O
• Configurable via RSLogix 5000 or Studio 5000 software
• Supports ControlNet network diagnostic and management functions
• Optical isolation between the backplane and network ports

Technical Specifications

• Media Type: RG-6 coaxial with BNC connectors (redundant support)
• Communication Rate: 5 Mbps (ControlNet standard)
• Backplane Current Draw: 1.0 A at 5.1V DC
• Isolation Voltage: 30V (continuous), basic insulation between backplane and network
• Module Location: Any slot in a ControlLogix chassis
• Maximum Network Nodes: 99 (logical)
• Operating Temperature: 0 to 60°C
• Storage Temperature: -40 to 85°C
• Relative Humidity: 5% to 95% non-condensing
• Certifications: UL, CE, CSA, KC, ATEX

Application Areas

• Real-time control and I/O over ControlNet
• Distributed motion and process control systems
• Redundant network architectures in critical environments
• High-speed data exchange between controllers and devices
• ControlNet device integration in manufacturing systems

Advantages

• Redundant media support enhances network reliability and fault tolerance
• Provides deterministic communication with low latency
• Scalable architecture for complex automation systems
• Seamless integration with existing ControlNet infrastructure
• Fully supported within the Rockwell Automation software environment