• Allen-Bradley 1756-CNB
  • Allen-Bradley 1756-CNB
  • Allen-Bradley 1756-CNB
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Allen-Bradley 1756-CNB ControlLogix ControlNet Communication Bridge Module

Allen-Bradley 1756-CNB ControlLogix ControlNet Communication Bridge Module

Description

The Allen-Bradley 1756-CNB is a ControlLogix ControlNet Communication Bridge module designed to facilitate high-speed data exchange between a ControlLogix controller and a ControlNet network. As a critical component in the...

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SKU: 1756-CNB
Vendor: Allen-Bradley
Category: Communication Module
Related Series:

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Description

The Allen-Bradley 1756-CNB is a ControlLogix ControlNet Communication Bridge module designed to facilitate high-speed data exchange between a ControlLogix controller and a ControlNet network. As a critical component in the ControlLogix architecture, this module manages the transfer of I/O data and messaging across the network, supporting up to 99 nodes and 64 connections. It provides a reliable interface for distributed control systems requiring deterministic communication performance.

Features

  • Supports ControlNet communication at a rate of 5 Mbps.
  • Provides a single ControlNet port for network connectivity.
  • Designed for seamless integration into the ControlLogix chassis.
  • Supports up to 99 nodes and 64 connections for scalable network configurations.
  • Efficient power management with low thermal dissipation.

Technical Specifications

Product Model 1756-CNB
Module Type ControlNet Bridge Module
Communication Rate 5 Mbps
Maximum Nodes 99
Maximum Connections 64
Input Current 970 mA at 5.1 VDC; 1.7 mA at 24 VDC
Power Dissipation 5.1 Watts
Thermal Dissipation 17.4 BTU/hr

Installation Guidelines

  • Ensure the ControlLogix chassis is powered down before inserting or removing the module.
  • Slide the module into the designated slot in the chassis and ensure it is fully seated before tightening the mounting screws.
  • Use appropriate ControlNet cabling and ensure proper termination at both ends of the network segment to maintain signal integrity.
  • Maintain adequate clearance around the chassis to ensure proper airflow and cooling.
  • Avoid routing communication cables near high-voltage lines or sources of electromagnetic interference (EMI).
  • Follow standard ESD (Electrostatic Discharge) precautions when handling the module.

FAQ

What is the primary function of the 1756-CNB?

The 1756-CNB acts as a bridge between the ControlLogix backplane and the ControlNet network, allowing the controller to communicate with remote I/O and other controllers on the network.

Does this module require external power?

No, the 1756-CNB draws its required power directly from the ControlLogix chassis backplane.

What is the maximum data rate for this module?

The 1756-CNB supports a fixed ControlNet communication rate of 5 Mbps.