When Legacy Networks Still Run the Plant
DeviceNet once stitched together thousands of plants, and plenty of those lines still run today. The Allen-Bradley 1769-ADN/A keeps a CompactLogix 1769 I/O rack talking on that network as a DeviceNet slave node, so existing scanners and masters keep working without a full controls overhaul.
Rockwell Automation discontinued the 1769-ADN/A on 2016-12-31 with no planned replacement, pointing users toward migration paths such as 1769-AENT. For plants that are not ready to migrate, sourcing tested spares is the practical route. Oil AutoTech specializes in fast-dispatch spares for oil, gas and industrial automation, with quick worldwide delivery and hands-on technical selection help.
What the 1769-ADN/A Does
This DeviceNet adapter module is part of the CompactLogix / Bulletin 1769 family. It lets a 1769 Compact I/O rack operate as a DeviceNet slave node under a master or scanner, which is exactly what you need when a line controller already speaks DeviceNet and you want to add or maintain 1769 I/O without changing the network.
Key Parameters
| Specification | Value |
|---|---|
| Product Type | DeviceNet Adapter Module |
| Data Rates | 125 / 250 / 500 kbps |
| Node Capacity | Up to 30 nodes |
| I/O Data | 180 in / 180 out words |
| Backplane Current (Series A) | 450 mA at 5 V DC |
| DeviceNet Current | 90 mA at 24 V |
| Heat Dissipation | 4.7 W max |
| Operating Temperature | 0 to 60 C |
Where It Fits in the Field
A waterflood station running an older DeviceNet scanner can keep its CompactLogix rack in service by dropping in a 1769-ADN/A, avoiding a controls migration mid-campaign. On a gas compressor skid, the adapter carries 180 input and 180 output words between field devices and the scanner, enough for digital and analog points on a typical package. In a packaging area, the 125/250/500 kbps rates let you match network speed to cable length and traffic rather than rebuilding the segment.
Installation and Network Notes
The module mounts on a DIN rail or panel, locks together with adjacent 1769 modules, and draws power from the 1769 bus. Series A carries a power supply distance rating of 4 modules, so plan the rack layout accordingly. For DeviceNet wiring, confirm baud rate, termination and cable routing against your network design before commissioning. Integration Note: wiring into a DeviceNet network may require an external gateway or connection module; confirm cables and gateways with your supplier.
Maintenance and Reliability
Inspect the module periodically for secure mounting, clean connections and stable network status. Keep the enclosure within the 0 to 60 C operating range and watch heat dissipation of 4.7 W max when racks are densely packed. Because the 1769-ADN/A is discontinued, treat each spare as a long-term asset: label it, store it in a dry location, and keep at least one ready-to-ship unit on the shelf.
Selection Checklist
Before ordering, verify the catalog number 1769-ADN/A, the Series A suffix, and that your application needs a DeviceNet slave adapter rather than an EtherNet/IP bridge. Check node count, word capacity and baud rate against your scanner configuration. Please verify current lifecycle status and availability with Oil AutoTech before ordering. Contact Oil AutoTech today for pricing and availability.
