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

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.