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Description

The Allen-Bradley 1756-CN2R is a high-performance ControlLogix communication bridge module designed for seamless integration within ControlNet networks. This dual-channel interface module supports redundant media configurations, ensuring high availability and robust data exchange for industrial automation systems. It serves as a critical link in the ControlLogix architecture, facilitating efficient communication between controllers and distributed I/O devices.

Features

  • Dual-channel interface for reliable network connectivity.
  • Supports redundant media to minimize downtime in critical applications.
  • ControlNet communication rate of 5 Mbps.
  • Capacity for up to 128 Logix connections.
  • Scalable architecture supporting up to 99 nodes on the network.
  • Directly mounts into the ControlLogix chassis for high-speed backplane communication.

Technical Specifications

Model Number 1756-CN2R
Module Type ControlNet Bridge Module
Communication Rate 5 Mbps
Logix Connections 128
Node Capacity 99
Backplane Current 5.1 Volts DC
Manufacturer Allen-Bradley

Installation Guidelines

  • Ensure the ControlLogix chassis is powered down before inserting or removing the 1756-CN2R module to prevent electrical damage.
  • Verify that the module is fully seated in the chassis slot and the locking tabs are secured.
  • Use appropriate shielded ControlNet cabling to maintain signal integrity and minimize interference from high-EMI sources.
  • Follow standard ESD (Electrostatic Discharge) mitigation protocols when handling the module to protect internal circuitry.
  • Ensure proper grounding of the chassis and network shield to maintain system stability.

FAQ

What is the primary function of the 1756-CN2R?
The 1756-CN2R is a bridge module that enables a ControlLogix controller to communicate over a ControlNet network, supporting both standard and redundant media setups.

Does this module support redundant media?
Yes, the 1756-CN2R is specifically designed to support redundant media, providing a backup physical path for network data to ensure continuous operation.

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