Enhance Your Point I/O System Scalability

The Allen-Bradley 1734-EP24DC serves as a vital expansion power supply for the POINT I/O family. As industrial automation systems grow, a single adapter often lacks the necessary backplane current to support a long string of modules. The 1734-EP24DC solves this challenge by boosting the POINTBus current and creating a new field power partition. This module allows engineers to scale their I/O racks reliably while maintaining electrical isolation between different segments of the system.

Core Technical Specifications

The 1734-EP24DC integrates seamlessly into any 1734 POINT I/O assembly. Below are the critical performance parameters:

• Manufacturer: Allen-Bradley / Rockwell Automation
• Product Line: Point I/O 1734
• Part Number: 1734-EP24DC
• Module Type: Expansion Power Supply
• Input Voltage: 24V DC Nominal (Range: 10–28.8V DC)
• Field Power Current: 10 Amps maximum
• POINTBus Output Current:
  • Horizontal Mount: 1.3 A @ 19.2–28.8V input; 1.0 A @ 10–19.2V input
  • Vertical Mount: 1.0 A @ 10–28.8V input
• Inrush Current: 6 Amps for 10 milliseconds
• Power Consumption: 9.8 Watts @ 28.8V DC
• Thermal Dissipation: 10.0 BTU/hr
• Isolation Voltage: 50V Continuous
• Operating Temperature: -25°C to 60°C (-13°F to 140°F)

Functional Role in Power Partitioning

The 1734-EP24DC does more than just supply power; it acts as a functional “break” in the field power bus. When you install this module, it physically separates the field power from the I/O modules on its left and initiates a new power segment for the modules on its right. This partitioning is essential when mixing different voltage types or when the cumulative current draw of field devices exceeds the 10A limit of the initial adapter.

The module’s dark gray housing provides an immediate visual cue for maintenance teams. This distinct color helps technicians quickly identify power supply points within a dense I/O rack, simplifying troubleshooting and system audits.

Superior System Capacity and Flexibility

A single 1734-EP24DC can support the installation of 4 to 17 POINT I/O modules, depending on the specific current requirements of the connected I/O. By placing multiple expansion supplies in a single row, users can create exceptionally large I/O configurations without losing signal integrity or experiencing voltage drops on the backplane.

The module also features robust protection mechanisms. It includes integral reverse polarity overvoltage protection, ensuring that accidental wiring errors do not damage the expensive I/O modules further down the bus. Furthermore, if the input supply voltage drops out for up to 10 milliseconds, the 1734-EP24DC maintains a steady output voltage, providing high immunity to minor power fluctuations.

Installation and Diagnostics

Mounting the 1734-EP24DC is straightforward, as it snaps directly onto a standard DIN rail. It supports both horizontal and vertical orientations, though users must account for the slight reduction in POINTBus output current when mounting the unit vertically.

For real-time monitoring, the module features two clear LED indicators:

1. Field Power Status: Confirms that the 24V DC field-side power is present and active.
2. 5V System Power: Indicates that the module is successfully converting input power to the 5V DC required for the POINTBus backplane.

Why Choose the 1734-EP24DC?

Automation professionals choose this expansion supply for its reliability and high current density. With a 10A field power capacity and a maximum of 1.3A for the backplane, it provides the most robust power solution for the 1734 series. Whether you are building a new control system or expanding an existing one, the 1734-EP24DC ensures your POINT I/O hardware receives clean, consistent power.