Description

Brief Product Description

The Allen-Bradley 1746-P2 is a high-performance AC power supply module designed specifically for the SLC 500 modular chassis system. It provides regulated 5V DC and 24V DC power to drive backplane logic and auxiliary user devices in industrial automation environments.¹

Reliable System Power and Backplane Distribution

The Allen-Bradley 1746-P2 serves as the primary energy source for SLC 500 modular controller architectures. This chassis-mounted unit converts standard AC line voltage into the regulated DC power required for the processor and I/O modules to function correctly. By occupying the dedicated power supply slot on the far left of the 1746 chassis, the module provides a robust 5-Ampere output at 5V DC for backplane logic and nearly 1 Ampere at 24V DC for external user applications.² Because it mounts directly to the chassis frame, it does not consume a standard functional I/O slot, allowing for maximum system density.

Advanced Protection and Voltage Flexibility

This power supply incorporates versatile input circuitry to accommodate diverse global electrical standards. Users can easily configure the module for either 120V AC or 240V AC operation by adjusting the internal jumper pins. Furthermore, the 1746-P2 prioritizes hardware safety through an 1800V AC isolation rating and a replaceable 1746-F2 fuse that mitigates short-circuit risks. To enhance system uptime during unstable power conditions, the unit provides a 20ms hold-up time. This window allows the SLC processor to execute orderly shutdown procedures or bridge minor power flickers without losing critical program data.

Industrial Endurance and Operation

Engineered for the demands of continuous manufacturing, the 1746-P2 maintains peak performance across a temperature range of 0°C to 60°C.³ The module features an open-style enclosure that facilitates natural convection cooling, ensuring the internal electronics remain within safe thermal limits. Additionally, the unit exhibits intelligent overcurrent behavior depending on its hardware series. For instance, Series C modules offer enhanced continuity by allowing the CPU to remain active even if the 24V user power loop encounters a fault. These features, combined with its rugged construction, ensure that the 1746-P2 provides a stable foundation for critical SLC 500 control applications.

Key Technical Characteristics

• Dual Output Capacity: Delivers 5A at 5V DC and 0.96A at 24V DC simultaneously.⁴
• Configurable AC Input: Supports 85–132V AC or 170–265V AC via manual jumper selection.⁵
• Extended Hold-up Time: Maintains output for 20ms at full load to prevent nuisance trips.⁶
• High Dielectric Isolation: Features 1800V AC RMS protection to safeguard backplane electronics.⁷
• Integrated Status Monitoring: Front-panel indicators allow for rapid visual diagnostic of power health.⁸
• Compact Footprint: Fits seamlessly into the leftmost chassis slot with accessible terminal blocks.

Technical Specifications