Allen-Bradley 1756-CNB/E ControlNet Bridge Module

The Allen-Bradley 1756-CNB/E was a ControlNet Bridge Module within the ControlLogix platform by Rockwell Automation. While discontinued since February 2015, it previously enabled communication between ControlLogix controllers and devices on a ControlNet network. Here's a breakdown of its specifications and features:

Specifications:
Network Protocols: ControlNet (BNC connector), EtherNet/IP (RJ-45 connector)
Number of Nodes: Supports up to 99 nodes on the ControlNet network
Communication Rate: 5 Mbps
Logix Communication Connections: 40-48 connections
Supported Connections: Up to 64 connections and 20 unconnected messages
Isolation Voltage: 30V continuous
Power Consumption: 5.14W at 5.1V DC, 1.7mA at 24V DC
Operating Temperature: -40 to 70°C (-40 to 158°F)

Features:
Bridge Functionality: Bridged ControlNet networks to EtherNet/IP networks, facilitating communication between different network segments.
High Node Capacity: Supported a substantial number of nodes on the ControlNet network, offering flexibility for large systems.
Multiple Connections: Facilitated numerous connections between devices on the network, enabling complex communication configurations.
Unconnected Messages: Allowed for storing messages even when the destination node was unavailable, ensuring reliable data transfer.
Robust Design: Built for industrial environments with isolation and wide operating temperature range.

Applications:
Connecting ControlLogix controllers to legacy ControlNet devices: Providing backward compatibility in systems with existing ControlNet infrastructure.
Expanding ControlNet networks: Extending the reach of ControlNet networks to additional devices and segments.
Creating isolated network segments: Segmenting networks for improved security and performance.
Data exchange between different network protocols: Facilitating communication between devices using ControlNet and EtherNet/IP.

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