Allen-Bradley 1756-CNB ControlNet Bridge Module for ControlLogix

Product Overview

The Allen-Bradley 1756-CNB is a ControlNet bridge module. It links ControlLogix racks to a ControlNet network. This module handles scheduled and unscheduled data. It supports up to 64 bidirectional connections. The 1756-CNB works with Logix5550 controllers for I/O control. It also routes messages to other networks. This module is ideal for users with 40 to 48 Logix connections.

This module has a 5 Mbps communication rate. It supports up to 99 nodes on the network. The 1756-CNB has two ports: one BNC and one RJ-45. The BNC port is for non-redundant media. The RJ-45 port is the network access port (NAP). This module uses 970 mA at 5.1 VDC and 1.7 mA at 24 VDC. Its power dissipation is 5.1 Watts.

Application Scenarios

The 1756-CNB is used in industrial automation systems. It connects remote I/O modules to a ControlLogix controller. It works well for data collection and machine control. The module supports produced and consumed tags for data sharing. It also handles unscheduled MSG instructions. This bridge module is common in manufacturing plants and process control. It is also used in material handling and packaging systems.

Technical Specifications

Here are the key specs for the 1756-CNB. It has 64 maximum connections. It supports 99 nodes. The communication rate is 5 megabits per second. The input current is 970 mA at 5.1 VDC. It also uses 1.7 mA at 24 VDC. The thermal dissipation is 17.4 BTU per hour. The power dissipation is 5.1 Watts. The slot width is 1. The weight is 0.57 pounds (0.26 kilograms). The module has one BNC connector and one RJ-45 connector.

Installation & Maintenance Guide

Set the node address switches on the module first. Choose a unique address from 01 to 99. Use the same address for redundant pairs. Install the module into a ControlLogix chassis slot. Connect the ControlNet cable to the BNC port. Use the NAP port for local network access. Ensure the path information is correct for proper routing. The module supports up to 20 buffers for unconnected messages. Do not exceed 64 connections for best performance.

Packing List

One Allen-Bradley 1756-CNB ControlNet Bridge Module. No cables or accessories are included. The module is shipped in an anti-static bag. Shipping is via Fedex, UPS, or DHL.