Product Overview
The Allen-Bradley 1769-SDN is a DeviceNet scanner module in the Compact I/O (Bulletin 1769) family. It lets a CompactLogix controller communicate with and control DeviceNet networked devices. This module supports configurable baud rates and can manage a large number of DeviceNet nodes.
Rockwell Automation has discontinued the 1769-SDN as of 2025-12-31. The official engineering replacement is the 1788-EN2DNR, an EtherNet/IP-to-DeviceNet linking device. Note that the 1788-EN2DNR is an external DIN-rail linking device, not a slot-for-slot in-chassis scanner. If you still run CompactLogix lines with DeviceNet devices, plan your migration now. Oil AutoTech can help you confirm availability and select the right path forward.
Technical Specifications
The 1769-SDN delivers practical DeviceNet scanning for CompactLogix systems. Key parameters include:
- DeviceNet scanner type
- Baud rates: 125/250/500 Kbps
- Up to 64 nodes
- Current draw: 440mA @ 5V
- Power: 4.7W
- Isolation: 30V
These specs mean the module handles medium-to-large DeviceNet networks with flexible speed settings. The 30V isolation protects the backplane from field-side transients. The 440mA @ 5V draw and 4.7W power fit standard 1769 power budgets. Always verify your total 1769 bus load before adding modules.
Compact I/O Family Context
The 1769 family installs on a panel (two screws) or DIN rail. Modules lock together via tongue-and-groove and share an integrated bus. They plug onto the controller’s right-side expansion bus. The controller distributes 5V and 24V DC to 1769 modules. A 1769 power supply module powers the system, supporting up to eight I/O modules per side. Operating temperature is 0 to 60 C.
Comparison: 1769-SDN vs. Alternatives
| Feature | 1769-SDN | 1788-EN2DNR | 1768-CNB (ControlNet) |
|---|---|---|---|
| Function | DeviceNet scanner | EtherNet/IP-to-DeviceNet linking device | ControlNet communication module |
| Mounting | In-chassis, right-side 1769 bus | External DIN-rail DLR | In-chassis, left-side 1768 backplane |
| Network | DeviceNet | EtherNet/IP to DeviceNet | ControlNet |
| Status | Discontinued 2025-12-31 | Active replacement | Active (different network) |
| Best for | Legacy CompactLogix DeviceNet | Migration to EtherNet/IP | ControlNet-based systems |
This table helps you see why the 1788-EN2DNR is the official path. It moves DeviceNet traffic onto EtherNet/IP while keeping your existing DeviceNet devices. The 1768-CNB serves a different network and does not replace the 1769-SDN.
Industry Applications
DeviceNet remains common in oil and gas, food processing, and automotive lines. The 1769-SDN fits these settings:
- Oil and gas skids: Connect valve banks, drives, and sensors on a DeviceNet trunk. The 64-node capacity supports large skids. The 125/250/500 Kbps rates let you trade speed for cable length.
- Packaging lines: Link remote I/O and motor starters. The 30V isolation helps in noisy electrical environments.
- Material handling: Manage distributed photoeyes and diverters. The 4.7W draw keeps panel heat low.
Because the module is discontinued, new builds should use the 1788-EN2DNR. For existing installations, spares when you need them matter. Oil AutoTech focuses on fast dispatch, worldwide for oil, gas, and industrial automation spares.
Installation and Setup
Mount the 1769-SDN on a panel or DIN rail. Lock it to adjacent 1769 modules using the tongue-and-groove joint. Plug it onto the controller’s right-side expansion bus. The integrated bus connector carries 5V and 24V DC from the 1769 power supply. Keep up to eight I/O modules per side of the supply.
Set the baud rate to match your DeviceNet trunk: 125, 250, or 500 Kbps. Use the node address and scan list configuration in your CompactLogix project. Confirm the 30V isolation wiring practices and follow the manufacturer’s installation guide. Do not exceed the 440mA @ 5V backplane budget.
Maintenance and Reliability
Inspect the module periodically for loose connections and dust buildup. Check the DeviceNet trunk for proper termination and cable condition. Monitor the 4.7W power draw as part of your panel thermal review. The 0 to 60 C operating range suits most industrial enclosures, but keep airflow clear.
Since the 1769-SDN is discontinued, stock known-good spares. A failed scanner can stop a whole line. Fast dispatch, worldwide from Oil AutoTech reduces that risk. Plan your replacement with the 1788-EN2DNR before spares run out.
Compatibility and Integration
The 1769-SDN works with CompactLogix controllers that accept 1769 modules. It communicates over DeviceNet at 125/250/500 Kbps and supports up to 64 nodes. For migration, the 1788-EN2DNR links EtherNet/IP to DeviceNet on a DIN rail. It is an external linking device, not a slot-for-slot in-chassis scanner.
Integration Note
When wiring into DeviceNet or EtherNet/IP networks, you may need an external gateway or connection module. Confirm cables, connectors, and gateways with your supplier before ordering.
Selection Guide
Before you buy, verify these points:
- Your controller accepts 1769 modules on the right-side expansion bus.
- Your network uses DeviceNet and matches 125/250/500 Kbps.
- Your node count stays within 64 nodes.
- Your 1769 power supply budget covers 440mA @ 5V and 4.7W per module.
- You understand the discontinued status and the 1788-EN2DNR replacement path.
Oil AutoTech offers hands-on technical selection help. Contact Oil AutoTech today for pricing and availability.
Troubleshooting
Common issues include no network communication, wrong baud rate, and node address conflicts. Check the trunk termination and cable integrity first. Confirm the scan list in your CompactLogix project. Verify the 30V isolation wiring is correct. If the module draws no power, check the 5V backplane supply and the 440mA budget. For persistent faults, swap in a known-good spare and inspect the bus.
FAQs
Is the 1769-SDN still available?
No. Rockwell Automation discontinued it on 2025-12-31. Contact Oil AutoTech for current stock and alternatives.
What is the official replacement for the 1769-SDN?
The 1788-EN2DNR, an EtherNet/IP-to-DeviceNet linking device. It is an external DIN-rail device, not a slot-for-slot in-chassis scanner.
What baud rates does the 1769-SDN support?
It supports 125, 250, and 500 Kbps DeviceNet rates.
How many DeviceNet nodes can it manage?
Up to 64 nodes.
What are the power requirements?
440mA @ 5V and 4.7W, with 30V isolation.
