1769-SDN | Allen-Bradley CompactLogix DeviceNet Scanner Communication Module

Network Integration and Control

The 1769-SDN serves as a high-performance communication interface, acting as a bridge between CompactLogix or MicroLogix 1500 controllers and a DeviceNet industrial network. This scanner module manages data exchange between the processor and various field devices, such as motor starters, sensors, and actuators. By offloading network management tasks from the CPU, the 1769-SDN ensures low-latency control and robust synchronization. It supports the full implementation of the DeviceNet protocol, including strobe, poll, cyclic, and change-of-state (COS) data transmission methods to optimize network bandwidth.

Technical Specifications

• Manufacturer: Allen-Bradley / Rockwell Automation

• Model Number: 1769-SDN

• Network Protocol: DeviceNet (Controller-to-Device)

• Interface Rate: 125 kbps, 250 kbps, and 500 kbps (Auto-detect or manual)

• Backplane Current: 440 mA @ 5V DC

• Module Capacity: Supports up to 64 nodes per network

• DeviceNet Current: 90 mA maximum from the DeviceNet power supply

• Isolation Voltage: 30V continuous (Basic Insulation Type)

• Power Dissipation: 2.2 Watts

• Distance Rating: 8 modules (Maximum distance from power supply)

• Mounting: 35mm DIN rail or direct panel mounting

• Status Indicators: Module status, Network status, and a 2-digit alphanumeric diagnostic display

• Net Weight: 0.28 kg (0.61 lbs)

Diagnostic and Monitoring Features

A distinguishing feature of the 1769-SDN is its integrated two-digit diagnostic display, which provides real-time error codes and node status information without requiring external software. This facilitates rapid on-site troubleshooting and network health assessment. The module also supports comprehensive explicit messaging, allowing for remote configuration and advanced diagnostics of individual nodes via the backplane. Its standard 1769 form factor allows it to be placed in any available I/O slot within the chassis, provided the distance rating to the system power supply is respected.

Frequently Asked Questions

How do I configure the node address for the 1769-SDN?The module address and baud rate can be configured using RSNetWorx for DeviceNet software or through the hardware's onboard rotary switches/pushbuttons depending on the hardware revision.

Can I use multiple scanners in a single CompactLogix chassis?Yes, multiple 1769-SDN modules can be installed in a single rack to manage multiple DeviceNet subnets, provided the backplane power supply capacity and the processor's maximum I/O count are not exceeded.