Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | Allen-Bradley 1734-EP24DC |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | Expansion Power Supply / Bus Extension Module |
| Series | POINT I/O 1734 |
| Nominal Input Voltage | 24V DC |
| Input Voltage Range | 10-28.8V DC |
| Field Side Power Requirements | 24V DC @ 400mA maximum |
| POINTBus Output Current (Horizontal) | 1A @ 10-19.2V input; 1.3A @ 19.2-28.8V input |
| POINTBus Output Current (Vertical) | 1A @ 10-28.8V input |
| Maximum Field Power Bus Current | 10A |
| Inrush Current | 6A for 10ms maximum |
| Power Consumption | 9.8W @ 28.8V DC |
| Power Dissipation | 3.0W @ 28.8V DC |
| Thermal Dissipation | 10.0 BTU/hr @ 28.8V DC |
| Isolation Voltage | 50V continuous |
| Overvoltage Protection | Reverse polarity protected |
| Mounting | DIN Rail (Horizontal / Vertical) |
| Weight | Approx. 0.26 kg (0.56 lbs) |
Main Features and Advantages
Dual-Function Power and Bus Extension: The Allen-Bradley 1734-EP24DC serves as both a field power distributor and a POINTBus current extender, eliminating the need for separate modules to perform these functions. It passes 24V DC field power to I/O modules on its right while injecting up to 1.3A of fresh current into the 5V POINTBus backplane . This dual capability enables the construction of larger POINT I/O systems without requiring additional communication adapters, significantly reducing system cost and cabinet space requirements.
Field Power Partitioning for Enhanced Safety: The Allen-Bradley 1734-EP24DC creates an electrical break between its left and right sides, establishing a new field power partition segment. This allows engineers to isolate different I/O groups for functional or safety purposes—for example, separating 24V DC input circuits from output circuits, or partitioning hazardous-area modules from standard modules . The partitioning capability also simplifies maintenance by allowing one section of the I/O system to be de-energized while other sections continue operation.
Orientation-Dependent Current Ratings: The Allen-Bradley 1734-EP24DC provides different POINTBus output current ratings depending on mounting orientation, allowing system designers to optimize performance or space utilization. When mounted horizontally, the module delivers 1A at input voltages from 10-19.2V and 1.3A at input voltages from 19.2-28.8V. Vertical mounting provides a consistent 1A output across the full 10-28.8V input range . This flexibility enables installers to match the power budget to the available cabinet space and thermal conditions.
Robust Protection and Diagnostics: The Allen-Bradley 1734-EP24DC incorporates reverse polarity protection on its input, safeguarding the module against accidental wiring errors during installation . Dual green status indicators provide at-a-glance confirmation of both field power (24V) and system power (5V POINTBus) availability, enabling technicians to quickly verify power integrity without using external test equipment .
