Allen-Bradley 1788-CN2DN ControlNet DeviceNet Linking Device

Product Overview

The Allen-Bradley 1788-CN2DN is a high-performance linking device engineered to bridge communications between ControlNet and DeviceNet networks. This intelligent gateway allows a ControlNet-based controller to seamlessly access, configure, and control I/O devices on a DeviceNet network. By acting as a transparent proxy, the 1788-CN2DN reduces the complexity of multi-layered network architectures, enabling real-time data exchange across different protocols. Its robust, open-style design is tailored for industrial environments where high-speed synchronization and reliability are critical.

Technical Configuration

The 1788-CN2DN is optimized for high-speed industrial data routing:

• Protocol Conversion: Facilitates bi-directional data flow between ControlNet (RG6 coaxial) and DeviceNet (0.52 mm² wiring).
• Power System: Requires a stable 24V DC input with a typical low power consumption of 5W.
• Status Monitoring: Equipped with a comprehensive array of LED indicators for Module Status, Network Status, and Linking Activity.
• Rugged Construction: Features a zinc-plated, chromate-passivated steel DIN rail mounting system to resist corrosion and mechanical stress.
• High Survivability: Rated for an operating shock of 30G and an isolation voltage of 30V.

Technical Specifications

Installation Guide

Proper installation of the Allen-Bradley 1788-CN2DN is vital for maintaining network integrity. The device should be mounted on a grounded DIN rail within a protected enclosure, as it is an open-style module.

Network Integration

When connecting the ControlNet side, ensure the RG6 connectors are properly crimped and torqued. For the DeviceNet side, use standard 5-pin open style connectors. It is highly recommended to place the linking device as close to the center of the DeviceNet trunk line as possible to minimize signal drop.

Diagnostic LEDs

The LED panel provides instant feedback:

• Module Status: Solid green indicates the device is operational.
• Linking Activity: Flashing indicates data is actively being routed between networks.
• ControlNet A/B: Monitors the health of redundant ControlNet channels.

Engineering Advantages

The 1788-CN2DN is a lightweight yet powerful solution with a net weight of approximately 0.45 kg, making it easy to integrate into existing high-density control panels without significant structural changes. Its support for real-time communication protocols ensures that timing-critical data from DeviceNet sensors reaches the ControlNet master with minimal latency. Furthermore, the 30G shock rating makes it suitable for use in heavy industrial applications where machinery produces constant vibration or physical impacts.

Technical FAQs

Q1: Does this device require a separate node address on both networks?
A1: Yes, the 1788-CN2DN must be assigned a unique ControlNet node address and a DeviceNet MAC ID to be recognized by the respective network scanners.

Q2: Can I use this to bridge two ControlNet networks?
A2: No, this specific model is designed exclusively to bridge ControlNet to DeviceNet. For ControlNet-to-ControlNet bridging, you would require a different gateway module.

Q3: Is the 24V DC power provided by the DeviceNet cable?
A3: While DeviceNet carries power, it is best practice to provide a dedicated 24V DC source to the 1788-CN2DN power terminals to ensure stable operation of the internal linking logic, especially in large networks.