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Allen-Bradley 1756-DNB DeviceNet Scanner Module 

Product Overview

The Allen-Bradley 1756-DNB is a DeviceNet scanner module designed for the ControlLogix automation platform. This industrial communication module serves as a critical interface between DeviceNet networks and ControlLogix controllers, enabling seamless data exchange in industrial automation environments.

Key Features

• Network Bridging: Acts as a gateway between DeviceNet devices and ControlLogix controllers, facilitating bidirectional data transfer 

• High-Speed Communication: Supports DeviceNet communication rates of 125 KB/s, 250 KB/s, and up to 500 KB/s 

• Flexible Addressing: Configurable DeviceNet node addresses from 00 to 63 (default address: 63) supporting up to 64 nodes 

• Multiple Communication Methods: Utilizes strobe, poll, change-of-state, and cyclic messaging for efficient data exchange 

Technical Specifications

Electrical Characteristics

Mechanical Characteristics

Communication Parameters

Functional Description

The 1756-DNB module performs several critical functions in industrial automation systems:

1. Data Collection: Gathers input data from DeviceNet devices and organizes it for controller use 

2. Command Distribution: Transmits output data from the controller to DeviceNet devices

3. Configuration Management: Downloads configuration data to networked devices 

4. Status Monitoring: Tracks operational status of connected devices 

The module communicates with the controller using diagnostic tables, inputs, and outputs, exchanging configuration data, status information, and I/O data .

Application Scenarios

The 1756-DNB scanner module is widely used in:

1. Manufacturing Automation: Connecting sensors, actuators, and other field devices to ControlLogix systems in production lines 

2. Material Handling Systems: Integrating conveyor controls, sorters, and other material handling equipment 

3. Process Control: Linking process instrumentation to control systems in continuous process industries 

4. Packaging Machinery: Coordinating various components in high-speed packaging systems 

System Integration

When integrating the 1756-DNB module:

• Requires removable terminal blocks (RTB) or Bulletin 1492 wiring interface modules (IFM) for all field wiring when installed in ControlLogix framework 

• Supports hot-swapping (RIUP) for easier maintenance 

• Features electronic keying to help prevent incorrect module replacement 

• Includes I/O wizard in Studio 5000 Logix Designer application for simplified module configuration 

Related Modules

The 1756-DNB is part of the extensive ControlLogix I/O module family that includes:

• Digital I/O modules (1756-IB16I, 1756-OB32, etc.) 

• Analog I/O modules (1756-IF16, 1756-OF8, etc.) 

• Communication modules (1756-ENBT, 1756-CNBR, etc.) 

• Special function modules (1756-HSC, 1756-HYD02, etc.) 

Technical Support Resources

For installation and configuration assistance:

• Refer to Allen-Bradley module wiring guides covering 1756 series 

• Consult Rockwell Automation technical documentation

• Contact authorized Allen-Bradley distributors for application support

The 1756-DNB module remains a reliable solution for DeviceNet connectivity in ControlLogix systems, offering robust performance for industrial automation applications.

The structure and details of the product：

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