Product Overview

The Allen-Bradley 1771-P5E functions as a high-performance DC-input power supply for the PLC-5 and 1771 Universal I/O platform. This module converts a nominal 24V DC source into regulated +5V DC backplane power, sustaining the logic circuitry of processors and I/O modules installed within the chassis. By utilizing a DC input, this module supports remote or battery-backed applications where AC mains are unavailable or unreliable. We supply this unit as 100% Brand New and Factory Sealed, ensuring your legacy automation infrastructure receives peak performance and maximum component life.

Technical Specifications

The 1771-P5E delivers high-density current output while maintaining strict voltage regulation across the 1771 backplane.

Engineering Advantages

• Optimized for DC Microgrids: The 1771-P5E accepts a wide 20.5V to 30V DC input range. This allows the module to operate directly from industrial battery banks or 24V DC bus systems, making it an ideal choice for off-grid process sites or marine applications.

• High Current Density: Delivering a full 8 Amperes to the backplane, this module powers large-scale 1771 chassis configurations. It supports multiple high-draw modules, such as communication adapters and high-density analog cards, without current starvation.

• Integrated Power-Loss Delay: A user-selectable time delay allows the system to ride through momentary DC power dips. This feature prevents nuisance processor trips and data corruption during voltage fluctuations caused by the starting of heavy DC motors on the same circuit.

• Convection-Cooled Durability: The hardware design utilizes natural convection for cooling, eliminating the need for internal fans. This increases the module's MTBF (Mean Time Between Failures) in environments where dust or airborne contaminants would otherwise compromise mechanical cooling components.

FAQs

Q: Can I use the 1771-P5E in the same chassis as an AC power supply?

A: No. You must not mix different power supply models (AC and DC) to power a single backplane unless they are specifically designed for redundant configuration. The 1771-P5E serves as the primary power source for the 1771 chassis backplane.

Q: Does this module require a specific slot in the 1771 chassis?

A: Yes. In standard configurations, you install the 1771-P5E in the left-most slot of the 1771 I/O chassis to ensure proper distribution of the 5V DC current across the backplane bus.

Q: How does the module handle an over-voltage condition on the input?

A: The 1771-P5E includes internal protection circuitry and a 5A normal-blow fuse. If the input voltage exceeds the rated 30V DC limit significantly or an internal fault occurs, the fuse blows to protect the sensitive PLC-5 processor and I/O modules from electrical damage.

Q: Is the "Series E" (1771-P5E) compatible with older 1771 chassis?

A: Yes. The 1771-P5E is backward compatible with the entire 1771 Universal I/O chassis line. It replaces earlier series models while providing improved efficiency and updated protection standards.