1756-CNB Module for ControlLogix ControlNet Communication

1756-CNB module from Allen-Bradley is a ControlLogix ControlNet bridge module for industrial communication networks. It connects a ControlLogix chassis to a ControlNet network and supports data exchange between controllers, I/O, drives, and other automation devices.

Rockwell Automation describes this product as a ControlNet bridge module with 40 to 48 connections. The official product data lists ControlNet communication, one ControlNet BNC interface, 5000 kbps transmission rate, and up to 99 nodes. Therefore, it is useful for installed ControlNet systems that still need maintenance or replacement support.

ControlNet Bridge Support for Existing Plants

The 1756-CNB model is now discontinued, with an official discontinued date of December 31, 2024. Rockwell lists 1756-CN2 as an engineering replacement. However, many industrial sites still need this original module for direct replacement, spare stock, and legacy system continuity.

HKXY Instruments can help you check availability, confirm lead time, and quote this ControlLogix communication module. If you need an exact replacement, please provide the complete catalog number and system requirement. As a result, our team can help you avoid network compatibility issues during maintenance.

• Brand: Allen-Bradley / Rockwell Automation
• Model: 1756-CNB
• Series: ControlLogix
• Product type: ControlNet bridge module
• Interface: 1 ControlNet BNC
• Transmission rate: 5000 kbps

If you need the 1756-CNB module for a legacy ControlNet system, send your quantity and destination. We will reply with price, stock status, and delivery options.