Introduction to the Allen-Bradley 1734-ADN
Is your legacy DeviceNet network holding back your production line? The Allen-Bradley 1734-ADN POINT I/O DeviceNet adapter module offers a practical upgrade path for distributed control systems. As a key component of the POINT I/O series, this adapter bridges local I/O modules to a primary DeviceNet network, enabling seamless data transfer to your master controller. Whether you are replacing a failed unit or expanding an existing system, the 1734-ADN delivers reliable communication and flexible configuration.
Key Technical Specifications
The 1734-ADN operates on 23 Volts DC input voltage and draws 400 milliamps from the field side power supply. Its inrush current reaches 6 Amps, so ensure your power supply can handle this brief surge. Power consumption is rated at 8.1 Watts, with 2.8 Watts dissipated at 28.8 Volts. The module provides 1000 milliamps of POINTBus current to power attached I/O modules. It supports up to 63 modules and a maximum of 504 I/O points, making it suitable for medium to large distributed systems. DeviceNet communication rates include 125K, 250K, and 500K bits per second, with autobaud detection up to 1Mbaud. The 1734-ADN occupies the leftmost position in a POINT I/O rack and mounts vertically on a DIN rail.
Buyer’s Guide: Is the 1734-ADN Right for You?
Before purchasing, verify that your application requires a DeviceNet adapter for POINT I/O modules. The 1734-ADN supports up to 63 modules, so count your existing or planned I/O count. If you need more than 504 points, consider a different platform. Check that your power supply provides 23 Volts DC and can deliver the 400 milliamps field side power plus the 6 Amp inrush. The module’s DIN rail mounting requires vertical orientation; ensure your enclosure has adequate space. The embedded thumbwheel switch sets the DeviceNet address from 0 to 63. The ADR feature automatically transfers configuration from a removed device to its replacement, reducing downtime. For compatibility, confirm your master controller supports DeviceNet at 125K, 250K, or 500K baud. SpareTechPLC offers this module as a reliable replacement for existing DeviceNet adapters in POINT I/O systems.
Installation and Setup
Install the 1734-ADN on the left side of the POINT I/O system. Position it vertically against the DIN rail and apply firm pressure until the locking mechanism engages. Attach the DeviceNet plug to the terminal and tighten the holding screws on both sides. Set the address using the thumbwheel switch (0–63). On power-up, the module runs a self-test of program and internal memories, including status LEDs. Configure the backplane baud rate and subnet I/O module addresses for efficient operation with DeviceNet masters. The autobaud feature detects the network rate and matches it automatically.
Maintenance and Reliability
Regular inspection of the DeviceNet connections and power supply helps prevent communication faults. Check for loose screws on the DeviceNet terminal and verify the thumbwheel address remains correct. The module’s self-test on power-up provides a quick health check. Keep the enclosure free of dust and ensure adequate ventilation to dissipate the 2.8 Watts of heat. For safety-related systems, follow the manufacturer’s safety manual and inspect periodically. The ADR feature simplifies replacement: if a module fails, the new unit inherits the configuration automatically, minimizing downtime.
FAQs
What is the maximum number of I/O points supported by the 1734-ADN?
The 1734-ADN supports up to 504 I/O points across a maximum of 63 modules.
Can I use the 1734-ADN with a DeviceNet network running at 1Mbaud?
The module’s autobaud feature detects rates up to 1Mbaud, but the published communication rates are 125K, 250K, and 500K bits per second. Verify your master’s capability.
How do I set the DeviceNet address on the 1734-ADN?
Use the embedded thumbwheel switch on the upper right side of the module. Valid addresses range from 0 to 63.
What is the input voltage requirement for the 1734-ADN?
The module requires 23 Volts DC input voltage and draws 400 milliamps from the field side power supply.
Does the 1734-ADN support hot swapping?
The ADR (Auto Device Replace) feature transfers configuration from a removed device to its replacement, but always follow proper safety procedures during replacement.
