Allen-Bradley 1756-CNBR ControlLogix ControlNet Redundant Bridge

Manufacturer: Allen-Bradley
Product No.: 1756-CNBR
Condition： In stock
Product Type: Redundant Bridge
Product Origin: USA
Payment: T/T, Western Union
Weight: 293g
Shipping port: Xiamen
Warranty: 12 months

Quantity

Selected quantity: 1

Estimate delivery times: 12-26 days (International), 3-6 days (United States).

Return within 30 days of purchase. Duties & taxes are non-refundable.

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Product Overview

The Allen-Bradley 1756-CNBR is a high-speed communication bridge. It facilitates seamless data exchange between ControlLogix backplanes and ControlNet networks. This module features two BNC ports for redundant media support. It efficiently manages 5 Mbps transmission rates for scheduled and unscheduled data. Users should download the official 1756-CNBR user manual for detailed wiring and configuration instructions.

Technical Specifications

Brand: Allen-Bradley / Rockwell Automation
Model Number: 1756-CNBR
Product Series: ControlLogix
Communication Rate: 5 Mbps Standard
Network Capacity: Up to 99 Nodes
Logix Connections: 40 to 48 Connections
Max Connections: 64 Bidirectional Nodes
Backplane Current (5.1V DC): 970 mA
Backplane Current (24V DC): 1.7 mA
Power Dissipation: 5.5 Watts Maximum
Isolation Voltage: 30 Volts Continuous
Operating Temperature: 0 to 60 Celsius (32 to 140 Fahrenheit)
Physical Slot Width: 1 (Single Slot)

Installation and Compatibility

Chassis Support: Compatible with 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17.
Power Supplies: Works with 1756-PA72, 1756-PB75, and redundant 1756-PA75R.
Cabling Requirements: Uses 1786-RG6 quad-shield coaxial cable.
Programming Port: Includes one (1) 8-pin RJ45 Network Access Port (NAP).

Diagnostics and Maintenance

Visual Monitoring: Integrated LED indicators display module health and network status.
Media Supervision: Automatic switching occurs upon detection of trunkline failure.
Troubleshooting Efficiency: Built-in diagnostics identify node conflicts and tap reversal errors.
Configuration Ease: Local programming access via the front-facing NAP interface.

Application and Suitability

Process Control: Ideal for oil and gas refinery automation systems.
Infrastructure: Suitable for large-scale water treatment and utility management.
Manufacturing: Optimized for automotive assembly lines requiring high-speed interlocking.
Data Bridging: Perfect for linking multiple ControlLogix chassis across wide plant areas.

Shipping and Warranty Terms

Packaging List: One (1) Brand New 1756-CNBR Module with original protection.
Warranty Period: Comprehensive 12-month quality assurance.
Dispatch Time: Fast processing within 24-48 hours of order.
Logistics Partners: Express delivery via FedEx, UPS, or DHL.

Purchase and Selection Guide

Confirm your network requires media redundancy before selecting the 1756-CNBR.
Verify your total connection requirements do not exceed 64 nodes.
Ensure the chassis power supply can accommodate the 970 mA current draw.
Always use high-quality RG6 cables to maintain signal integrity.

Frequently Asked Questions (FAQ)

Can the 1756-CNBR operate with only one cable connected?
Yes, the module functions in simplex mode using only the primary port A.

How do I prevent communication loss during installation?
Check tap drop cable labels to avoid accidental reversal of redundant connections.

Is the NAP port intended for permanent monitoring?
No, use the NAP port for temporary configuration and local troubleshooting only.

What is the primary difference from the standard 1756-CNB?
The 1756-CNBR adds a second BNC port to support physical media redundancy.

PDF

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Q: Are these parts 100% original and new?

A: Yes. Every component is guaranteed to be 100% original, brand-new, and factory-sealed. We also provide a 12-month comprehensive warranty for your peace of mind.

Q: How fast is the shipping to my country?

A: For in-stock items, we offer same-day dispatch. International express shipping (DHL/FedEx/UPS) typically delivers within 3–5 business days worldwide.

Q: Can I get a formal quotation with shipping costs?

A: Absolutely. Our sales team is ready to provide a detailed Proforma Invoice (PI) including the most competitive shipping rates for your location.

Q: Do you offer discounts for bulk orders?

A: We provide volume-based pricing for large projects or multiple-item orders. Please contact us to get our Best Price Guarantee.

12-Month Comprehensive Warranty

Every part supplied by Global PLC Spare Hub is covered by a 12-month warranty from the date of invoice.

Coverage: Functional defects and hardware failures under normal operating conditions.
Commitment: We provide immediate repair, replacement, or a full refund for any verified defective components to minimize your operational downtime.

Returns & Exchange Policy

We offer a 30-day return policy to ensure you receive the exact part your system requires.

Eligibility: Returns are accepted for uninstalled items in their original, factory-sealed packaging.
RMA Process: Please contact our support team to obtain a Return Merchandise Authorization (RMA) number before shipping.
Fast Processing: Refunds or exchanges are processed within 3–5 business days after the returned item passes our technical inspection.

Need Technical Assistance?Not sure if this part is compatible with your system? [Consult our Engineers] before purchasing to ensure 100% compatibility.