Product Overview

The Allen-Bradley 1768-CNBR is a ControlNet communication module. It belongs to the CompactLogix series of programmable automation controllers. This module provides redundant bridge functionality on ControlNet networks.

The module supports deterministic and repeatable data delivery. Furthermore, it is frequently used in redundancy control and media systems. Therefore, it suits real-time, high-throughput applications.

General Specifications

The 1768-CNBR offers robust ControlNet connectivity for CompactLogix systems.

• Manufacturer: Rockwell Automation.

• Brand: Allen-Bradley.

• Product Line: CompactLogix.

• Part Number/Catalog No.: 1768-CNBR.

• Module Type: ControlNet Bridge Module.

• Shipping Weight: 2 lbs.

• Shipping Dimensions: 8 x 8 x 5 inches.

• Series: A and B.

• UPC: 10612598307507.

• UNSPSC: 32151705.

• Product Lifecycle Status: Discontinued/Obsolete.

Communication Specifications

The 1768-CNBR supports robust ControlNet communication.

• Communication Rate: 5 Mbps.

• ControlNet Nodes Supported: Up to 99 nodes.

• Logix Communication Connections: Up to 48 connections.

• Network Type: ControlNet (open network for real-time applications).

Power and Current Draw

The 1768-CNBR draws power from the backplane.

• Current Draw (5.2 Volts DC): 1.0 Amps.

• Heat Dissipation: 5.14 W (17.5 BTU/hour).

• Isolation Voltage: 30 Volts (tested at 500V AC for 60 seconds).

Physical Specifications

The 1768-CNBR has a compact footprint.

• Dimensions: 132 x 56.7 x 105.1 mm (5.20 x 2.23 x 4.12 inches).

• Weight: approx. 0.293 kg (0.64 pounds).

• Slot Width: Single slot.

• Enclosure Type: Open style.

• Temperature Code: T4.

Connectors and Cabling

The 1768-CNBR provides multiple connection options.

• ControlNet Ports: Two BNC connectors and one RJ45 port.

• Recommended Cable: Coaxial RG6 quad shield.

• Mounting Options: DIN rail or panel mount (using M4 or #8 screws).

Key Features

The 1768-CNBR offers several advantages for ControlNet networking.

Redundant Media Support:
Provides redundant bridge functionality. Therefore, it enhances network reliability for critical applications.

High Node Capacity:
Supports up to 99 ControlNet nodes. Consequently, it suits large distributed control systems.

Deterministic Communication:
Supports deterministic and repeatable data delivery. Hence, it guarantees predictable network performance.

Multiple Connection Types:
Includes two BNC and one RJ45 port. For this reason, it offers flexible cabling options.

Compact Single-Slot Design:
Occupies one slot in the CompactLogix chassis. Thus, it saves panel space.

Flexible Mounting:
DIN rail or panel mount with M4 or #8 screws. Therefore, it adapts to different installation requirements.

High Connection Capacity:
Supports up to 48 Logix communication connections. Consequently, it handles multiple controllers and HMIs.

T4 Temperature Code:
Suitable for Class I Division 2 hazardous locations. Hence, it meets safety requirements for industrial environments.

Typical Applications

The 1768-CNBR suits various ControlNet networking applications.

• Redundant ControlNet media systems.

• Distributed I/O communication with CompactLogix controllers.

• Real-time, high-throughput control networks.

• Retrofit and replacement in existing ControlNet systems.

• Hazardous area installations (Class I Division 2, T4).

Installation Guidelines

Install the 1768-CNBR in any slot of a CompactLogix chassis. First, ensure the chassis power supply can provide the required 1.0 Amp at 5.2V DC. Then, insert the module into the slot.

Mount the module on a DIN rail or panel using M4 or #8 screws. Connect the ControlNet network using BNC connectors or the RJ45 port. Use RG6 quad shield coaxial cable for reliable communication.

The module supports up to 99 ControlNet nodes and 48 Logix connections. It is rated for Class I Division 2 hazardous locations with T4 temperature code.

Note: This product has been discontinued and is considered obsolete. Availability is limited to remaining stock or used/refurbished units.

What is in the Box

Please inspect all items upon delivery.

• Allen-Bradley 1768-CNBR ControlNet bridge module.

• Installation instruction manual.

• Anti-static protective bag.

Frequently Asked Questions (FAQ)

1. What is the 1768-CNBR used for?

The 1768-CNBR is a ControlNet bridge module for CompactLogix systems. It provides redundant media communication and supports up to 99 ControlNet nodes.

2. How many Logix connections does this module support?

The 1768-CNBR supports up to 48 Logix communication connections. Therefore, it handles multiple controllers and HMI devices.

3. What is the communication rate of this module?

The 1768-CNBR operates at 5 Mbps on the ControlNet network. This provides real-time, deterministic data delivery.

4. What mounting options are available for this module?

The 1768-CNBR can be mounted on a DIN rail or panel. For panel mounting, use M4 or #8 screws.

5. Is the 1768-CNBR still in production?

No. The 1768-CNBR is discontinued and considered obsolete. Availability is limited to existing stock or used/refurbished units.