1756-CN2R | Allen Bradley |ControlLogix ControlNet Bridge Module

Product Overview

The Allen Bradley 1756-CN2R acts as a high-capacity communication bridge within the ControlLogix platform. This 100% brand new original module facilitates deterministic, high-speed data transfer between Logix5000 controllers and other ControlNet devices. By supporting redundant media, it ensures system-wide availability and network resilience for mission-critical industrial automation architectures.

Technical Specifications

• Manufacturer: Allen Bradley / Rockwell Automation

• Product Line: ControlLogix

• Module Type: Communication Bridge Module

• Protocol: ControlNet (Redundant)

• Maximum Nodes: 99

• Maximum Connections: 131 (128 Logix connections)

• Communication Rate: 5 Mbps

• USB Port Speed: 12 Mbps (High-speed USB 2.0)

• Backplane Current: 1300 mA @ 5.1V DC; 3 mA @ 24V DC

• Power Dissipation: 6.7 Watts

• Thermal Dissipation: 22.9 BTU/hr

• Operating Temperature: 0 to 60 °C (32 to 140 °F)

• Slot Width: 1 (Single slot)

• Compatible Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17

Engineering Advantages

• Fault-Tolerant Redundancy: Two BNC connectors support redundant ControlNet media. This architecture allows the network to switch paths instantly if a cable breaks, preventing process interruptions in continuous manufacturing environments.

• High-Density Networking: Supporting up to 99 nodes and 131 total connections, this module manages large-scale I/O trees and multi-processor coordination without degrading network determinism.

• Simplified Configuration: The integrated USB 2.0 port provides a direct localized access point for bridging to the backplane. Engineers can configure the module and monitor network health without searching for specialized serial cables.

• Flexible Chassis Placement: The 1756-CN2R fits into any available slot in a standard 1756 chassis. It works seamlessly with both standard and redundant power supplies (such as the 1756-PA75R), allowing for highly customized system builds.

FAQs

• Is this 1756-CN2R unit a brand new product?

  Yes, we supply only 100% brand new and original Allen Bradley hardware in its original, factory-sealed packaging to guarantee optimal performance.

• What type of cabling does this module require?

  The module requires 1786-RG6 quad-shield RG6 coaxial cable for ControlNet connections to maintain signal integrity and meet EMC requirements.

• Can I use the USB port for permanent data logging?

  The USB port serves primarily as a temporary programming and configuration interface. Use the ControlNet ports for permanent, high-speed system data exchange.

• Does this module support firmware updates?

  Yes, you can flash the module's firmware via the USB port or over the ControlNet network using ControlFlash software to access the latest features and security patches.