1756-CNBR Allen-Bradley ControlNet Redundant Bridge Module

Overview

The Allen-Bradley 1756-CNBR is an advanced ControlNet Bridge Module from Rockwell Automation, designed for ControlLogix systems. This module allows seamless communication between a ControlLogix controller and a ControlNet network, ensuring reliable, high-speed data transfer. With redundant ControlNet media, the 1756-CNBR ensures network stability even during cable or tap failures. It bridges scheduled and unscheduled data, supporting up to 64 connections and 99 nodes.

By adding an additional ControlNet port over the 1756-CNB, the 1756-CNBR offers an ideal solution for applications requiring redundant communication paths. This redundancy enhances network reliability, making it a vital component for critical processes where communication loss could lead to downtime.

Technical Specifications

• Brand: Allen-Bradley
• Model: 1756-CNBR
• Module Type: ControlNet Bridge Communication Module
• Chassis Compatibility: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
• Slot Width: 1 Slot
• Dimensions: 5.51 x 4.41 x 5.71 inches
• Weight: 0.64 lbs (0.293 kg)

Power & Current

• Current Draw (5.1VDC): 970 mA
• Current Draw (24VDC): 1.7 mA
• Power Dissipation: 5.5 Watts
• Thermal Dissipation: 17.4 BTU/hr
• Isolation Voltage: 30 Volts Continuous

Communication & Connections

• ControlNet Ports: 2 BNC Ports (Redundant and Non-Redundant)
• Network Access Port (NAP): 1 x RJ45 8-pin
• Communication Rate: 5 Mbps
• Logical Connections: 40-48
• Max Connections: 64
• Max Number of Nodes: 99

Cable & Installation

• Communication Cable: 1786-RG6 Quad Shield RG6 Coaxial Cable
• Power Supply Compatibility:
  • Standard: 1756-PA72/C, 1756-PA75/B, 1756-PB72/C, 1756-PB75/B
  • Redundant: 1756-PA75R, 1756-PB75R, 1756-PSCA2

Check official datasheet for more detailed information: ControlLogix and GuardLogix Controllers