Introduction: The Network That Refused to Die
In the late 1990s, DeviceNet promised a simpler path from the control cabinet to the plant floor. Engineers embraced it because it replaced bundles of discrete wiring with a single trunk line. Yet as Ethernet gained ground, many predicted DeviceNet would vanish overnight. It did not. Thousands of production lines still run on DeviceNet today, and the Allen-Bradley 1734-ADN/B exists precisely for that installed base. This adapter is the bridge between a legacy network and the modular POINT I/O system. Consequently, it keeps older cells productive without a full controls overhaul.
What Is the 1734-ADN/B DeviceNet Adapter?
The 1734-ADN/B is a POINT I/O DeviceNet adapter from Allen-Bradley, part of the Bulletin 1734 family. It connects POINT I/O modules to a DeviceNet network. On the local side, it acts as a POINTBus master; on the network side, it operates as a DeviceNet slave. The adapter supports up to 63 POINT I/O modules, which equals 504 I/O points. Furthermore, it accepts 24V DC input in the range of 10-28.8V. Internally, it converts that field power to 5V DC for the POINTBus backplane. As a result, every I/O module draws its logic power directly from the adapter.
Key Specifications of the 1734-ADN/B
- Input voltage: 24V DC nominal, 10-28.8V range.
- Backplane output: 5V DC via POINTBus.
- POINTBus current: 1000 mA.
- Network speed: 125/250/500 kbps AutoBaud.
- Module capacity: up to 63 modules (504 I/O points).
- Operating temperature: -20 to 55 C ambient.
- Product type: DeviceNet adapter module.
- Series suffix: B.
The AutoBaud feature is particularly practical. The adapter detects the network rate automatically, so technicians do not need to set DIP switches for 125, 250, or 500 kbps. In addition, the 1000 mA POINTBus budget allows a dense mix of input and output modules on one adapter. For precise electrical specifications, always confirm against the official datasheet.
Installation and Network Integration
Mount the terminal base on a DIN rail, then snap the 1734-ADN/B into the base. The removable terminal block accepts field wiring for 24V DC power and the DeviceNet trunk. Because the adapter handles the 5V DC backplane conversion, no separate backplane supply is required. When integrating into a DeviceNet network, wiring may require an external gateway or connection module. Confirm cables and gateways with your supplier before commissioning. Also verify the network termination and baud rate match the existing segment.
Lifecycle and Availability
Rockwell Automation has classified the 1734-ADN/B as End of Life, with a discontinuation date of 2026-12-31. No planned Rockwell Automation replacement exists. Therefore, please verify current lifecycle status and availability with AutoDCSTech before ordering. For existing DeviceNet installations, this adapter remains a practical spare.
Availability & Condition at AutoDCSTech
| Part Number | 1734-ADN/B |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
