Description

Product Overview

The Allen-Bradley 1756-DNB is a high-performance DeviceNet scanner module designed for the ControlLogix® platform. This interface enables a ControlLogix processor to communicate with and control up to 63 DeviceNet nodes, including sensors, motor starters, and actuator devices.

Streamlined Network Management and Scanning

The 1756-DNB module acts as the primary gateway between the ControlLogix backplane and the DeviceNet network. By executing high-speed I/O scanning, the module facilitates the rapid transfer of data between the controller and distributed field equipment. It effectively manages complex network traffic by supporting multiple messaging modes, such as Polled, Cyclic, Change-of-State (COS), and Bit-Strobe. Consequently, engineers can tailor the network communication to prioritize critical data, which significantly reduces network latency and optimizes overall system bandwidth.

Advanced Diagnostics and System Reliability

Beyond simple data transfer, the 1756-DNB provides extensive diagnostic tools that monitor the health of every connected node. The module features an integrated scrolling display on the front panel, which provides real-time status codes and error messages to assist technicians with immediate troubleshooting. Furthermore, this transparency allows operators to identify cable breaks, device failures, or configuration mismatches without needing a laptop. Because it integrates fully with RSNetWorx for DeviceNet, the module simplifies the commissioning process and ensures that the network maintains high availability in demanding manufacturing environments.

Versatile Integration and Configuration

This module offers exceptional flexibility by allowing installation in any available slot within a standard 1756 ControlLogix chassis. It supports data rates of 125k, 250k, and 500k bps, ensuring compatibility with various trunk line lengths and device requirements. Additionally, the 1756-DNB supports bridging and routing capabilities, which enables users to configure devices on the DeviceNet network from other networks like EtherNet/IP. This interconnectivity makes the 1756-DNB an essential component for facilities transitioning legacy hardware into modern, multi-layered automation architectures.

Technical Specifications