Description

The Allen-Bradley 1756-CNBR is a ControlLogix ControlNet Bridge module designed to facilitate high-speed communication between ControlLogix controllers and other devices on a ControlNet network. This module supports redundant media configurations, providing increased reliability for critical industrial automation applications. It acts as a bridge, allowing the controller to communicate with I/O modules, drives, and other controllers across the ControlNet link.

Features

• Supports redundant ControlNet media for enhanced network fault tolerance.
• Provides high-speed data transfer rates of 5 Mbps.
• Integrates seamlessly into the ControlLogix chassis, drawing power directly from the backplane.
• Designed for high-availability industrial control environments.
• Supports scheduled and unscheduled communication for deterministic I/O control.

Technical Specifications

Installation Guidelines

• Ensure the ControlLogix chassis is powered down before inserting or removing the 1756-CNBR module to prevent electrical damage.
• Align the module carefully with the chassis slot guides and press firmly until the module is seated and the locking tabs engage.
• Use appropriate ControlNet cabling and ensure proper termination at both ends of the network segment to maintain signal integrity.
• Maintain adequate clearance around the module to ensure proper airflow and cooling, as the module dissipates up to 5.5 Watts during operation.
• Follow standard ESD (Electrostatic Discharge) precautions when handling the module to protect internal circuitry.

FAQ

What is the primary function of the 1756-CNBR?

The 1756-CNBR is a communication bridge that allows a ControlLogix controller to interface with the ControlNet network, enabling data exchange with remote I/O and other controllers.

Does this module support redundant networks?

Yes, the 1756-CNBR is specifically designed to support redundant ControlNet media, which provides a backup communication path in the event of a cable failure.

What is the power requirement for this module?

The module draws 970 mA from the 5.1V DC backplane and 1.7 mA from the 24V DC source.