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AB 1756-CNB Product Details

Oct 26, 2025 Allen‑Bradley

1756-CNB is a module in the ControlLogix series of programmable controllers(PLCs)produced by Rockwell Automation.Specifically,it is a communication module.The following is a detailed introduction to the 1756-CNB communication module.

Allen‑Bradley 1756-CNB

Main functions and applications

Communication realization:The 1756-CNB communication module is mainly used to realize data transmission and communication between industrial automation equipment.It is a communication module for the ControlLogix control system.It can be easily connected to various industrial automation equipment and systems.

Data exchange:This module allows data to be exchanged bidirectionally between different devices to achieve data sharing,monitoring and control.This helps to improve the overall performance and efficiency of industrial automation systems.

Application areas:The 1756-CNB communication module is widely used in industrial automation,Internet of Things,smart home,smart transportation and other fields.In industrial automation,it can be used to connect sensors and controllers to achieve real-time data acquisition and control;in the Internet of Things,it can be used to achieve interconnection between devices and build an intelligent Internet of Things system.

Allen‑Bradley 1756-CNB

Technical Features

Versatility:The 1756-CNB communication module is a universal communication module with wide applicability.It can be applied to communication between various industrial automation equipment such as PLC,DCS,robots,etc.

Multi-protocol support:The module supports a variety of different communication protocols,such as Modbus,Profinet,EtherCAT,Ethernet/IP,ControlNet,DeviceNet,etc.,and can seamlessly connect and exchange data with equipment and systems from different manufacturers.

High reliability:The 1756-CNB communication module uses reliable electronic components and designs,and can operate stably in harsh industrial environments to ensure the accuracy and reliability of data transmission.It supports ControlNet redundancy to improve system reliability and has built-in diagnostics and status indicators for easy troubleshooting.

Easy to configure and maintain:The module supports a variety of programming languages​​and programming tools,such as RSLogix 5000 or Studio 5000,which can be easily configured and maintained.At the same time,it also provides rich diagnostic and debugging functions to help users quickly locate and solve problems.

Scalability:The 1756-CNB communication module is scalable and can be customized and expanded as needed to meet different control requirements and application scenarios.On the ControlNet network,it supports up to 99 nodes and provides a maximum data transmission rate of 5Mbps.

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