Product Overview
The ALLEN-BRADLEY 1734-ADN is a POINT I/O DeviceNet Network Adapter engineered to serve as the communication gateway between POINT I/O modules and a DeviceNet network. As a core component of the Bulletin 1734 POINT I/O distributed I/O system, the ALLEN-BRADLEY 1734-ADN operates simultaneously on the primary DeviceNet network and the internal POINTBus backplane, functioning as both a DeviceNet slave to the network master and a master scanner for the POINT I/O modules on its backplane . This dual-network role enables the adapter to collect I/O data from connected modules and transmit it to a DeviceNet scanner (such as the 1756-DNB), while also receiving output commands from the controller and routing them to the appropriate I/O modules.
The ALLEN-BRADLEY 1734-ADN supports up to 63 POINT I/O modules on its backplane, accommodating a maximum of 504 I/O points . The adapter features autobaud capability, automatically detecting and matching the DeviceNet network baud rate from 125K, 250K, or 500K bits per second . Its auto-start mode, available in Series B versions, automatically configures all backplane modules by reading module IDs, setting sequential addresses, and generating a scan list—reducing commissioning time from hours to seconds . The ALLEN-BRADLEY 1734-ADN also supports Auto Device Replacement (ADR), allowing failed modules to be replaced without manual reconfiguration, as the adapter transfers stored configuration parameters to the new module automatically .
The module operates from a 24V DC power supply, provides 1000 mA of POINTBus current for backplane modules, and features LED indicators for adapter status, DeviceNet status, and POINTBus status . The ALLEN-BRADLEY 1734-ADN is designed for DIN rail mounting and supports Removal and Insertion Under Power (RIUP), enabling module replacement without system shutdown . As of December 31, 2026, this adapter has been discontinued by Rockwell Automation with no planned direct replacement, making existing inventory increasingly valuable for maintenance of installed systems .
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1734-ADN |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | POINT I/O DeviceNet Network Adapter |
| Series | POINT I/O 1734 |
| Input Voltage | 24V DC |
| Field Side Power | 400 mA |
| Inrush Current | 6 A |
| POINTBus Current | 1000 mA |
| Power Consumption | 8.1 W |
| Maximum Modules | 63 POINT I/O modules |
| Maximum I/O Points | 504 |
| DeviceNet Baud Rates | 125K, 250K, 500K bits/second |
| Dimensions (H×W×L) | 76.2 × 54.9 × 133.4 mm |
| Weight | 0.34 kg |
| Operating Temperature | -20°C to +55°C |
| Mounting | DIN Rail |
| Country of Origin | Singapore |
Main Features and Advantages
The ALLEN-BRADLEY 1734-ADN delivers core value by integrating DeviceNet connectivity, POINTBus management, and automated configuration features into a compact adapter that simplifies distributed I/O deployment.
Dual-Network Architecture: The ALLEN-BRADLEY 1734-ADN resides simultaneously on the primary DeviceNet network and the POINTBus backplane, functioning as a slave to the network master while acting as a master scanner for POINT I/O modules . This dual-role capability eliminates the need for separate scanner hardware, consolidating I/O data collection and network communication into a single module.
Auto-Start Configuration: Series B versions of the ALLEN-BRADLEY 1734-ADN support an auto-start mode that automatically sets all backplane modules to Auto Baud, reads module IDs, sets sequential addresses, and generates a scan list with I/O mapping based on byte, word, or double-word boundaries . This feature drastically reduces commissioning time, allowing the I/O system to be operational before other network nodes are added.
Auto Device Replacement (ADR): The ALLEN-BRADLEY 1734-ADN supports ADR functionality, automatically transferring configuration parameters from a failed module to its replacement . When an identical module is inserted, the adapter assigns the original node number and downloads stored configuration data, minimizing downtime and eliminating manual reconfiguration.
Autobaud Detection: The adapter automatically detects the DeviceNet network baud rate and configures itself to match, supporting 125K, 250K, and 500K bits per second . This feature simplifies network integration and prevents communication errors caused by mismatched baud rates.
Removal and Insertion Under Power (RIUP): The ALLEN-BRADLEY 1734-ADN supports RIUP, allowing modules to be replaced while the system remains powered . Combined with the removable wiring system, this capability enables maintenance and expansion without process interruption.
