Description

The Allen-Bradley 1756-CN2R is a high-performance ControlNet communication module designed for the ControlLogix platform. This bridge module facilitates robust data exchange across ControlNet networks, supporting redundant media configurations to ensure high availability in critical industrial control environments. It provides reliable, deterministic communication for distributed I/O and controller-to-controller messaging.

Features

• Dual-channel interface for flexible network topology
• Supports redundant media for increased fault tolerance
• Communication data rate of 5 Mbps
• Capacity for up to 128 Logix connections
• Supports up to 99 nodes on the ControlNet network
• Designed for seamless integration within the ControlLogix chassis

Technical Specifications

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 engaged.
• Use appropriate ControlNet coaxial cabling and tap components for the redundant media setup.
• Maintain proper grounding practices for the ControlNet trunk line to minimize EMI/RFI interference.
• Keep the module away from extreme heat sources and ensure adequate ventilation within the cabinet.
• Always follow standard ESD handling procedures when touching internal circuitry or connectors.

FAQ

What is the primary function of the 1756-CN2R?

This module acts as a bridge to connect the ControlLogix controller to a ControlNet network, allowing for deterministic, high-speed communication between controllers and remote I/O.

Does this module support redundancy?

Yes, the 1756-CN2R is specifically designed to support redundant media, which allows for a secondary cable path to maintain network integrity if the primary cable fails.

What is the maximum number of nodes supported?

The module supports up to 99 nodes on a single ControlNet network segment.