1768-CNBR | Allen Bradley CompactLogix ControlNet Bridge Module

Product Overview

The Allen Bradley 1768-CNBR functions as a high-performance communication interface for the CompactLogix™ platform. This module enables a 1768-L4x controller to bridge data between the local backplane and a ControlNet network. We supply this unit as 100% Brand New and Original, providing the "R" suffix capability for redundant media support. It serves as a critical link for deterministic, repeatable data transfers in complex distributed I/O architectures and multi-controller interlocking.

Technical Specifications

The 1768-CNBR integrates high-speed networking into the CompactLogix chassis with the following parameters:

Engineering Advantages

• Redundant Media Security: The "R" designation signifies support for redundant ControlNet media. The dual BNC ports allow for a secondary cable path. If a cable break occurs, the module switches paths instantly without interrupting the control process, preventing costly system downtime.

• Deterministic Data Execution: Unlike standard Ethernet, the 1768-CNBR utilizes the ControlNet protocol to ensure time-critical I/O data arrives at fixed intervals. This eliminates network collisions and "jitter," providing the precision required for high-speed motion and synchronized machinery.

• Streamlined ControlNet Bridging: The module acts as a transparent gateway, allowing your CompactLogix controller to communicate with remote 1794 FLEX™ I/O or 1715 Redundant I/O racks. It offloads communication tasks from the main CPU, maintaining high logic execution speeds.

• Hot-Swappable Configuration: The hardware supports Removal and Insertion Under Power (RIUP). Engineers can replace a module without shutting down the entire rack power, significantly reducing mean time to repair (MTTR) during maintenance cycles.

• Rugged 1768 Chassis Fit: The module slides directly into the high-speed 1768 bus. This dedicated bus structure provides higher bandwidth than standard 1769 backplanes, facilitating rapid data exchange between the bridge and the L43 or L45 processors.

FAQs

• Does the 1768-CNBR require an external power supply?

  No. The module draws its operating power directly from the 1768 backplane. Ensure your system power supply (such as a 1768-PA3 or PB3) has sufficient capacity for the communication bridge and the controller.

• Can I use this module in a 1769-only CompactLogix system?

  No. The 1768-CNBR specifically requires a 1768-L43 or 1768-L45 controller and a 1768 series chassis. It will not physically fit or function in a standard 1769-series CompactLogix rack.

• Is this a refurbished or used unit since the series is discontinued?

  We guarantee this 1768-CNBR is 100% Brand New and Original. It remains in its factory-sealed Allen Bradley packaging with the verifiable UPC (612598307500) and quality control seals intact.

• How do I set the network address for this module?

  You set the ControlNet node address via the two rotary switches located on the side of the module. Ensure you select a unique address (1 to 99) before inserting the module into the chassis.