1771-P5 | Allen Bradley | PLC 5 Chassis Power Supply Module

Product Overview

The Allen Bradley 1771-P5 serves as a high-current DC power supply module specifically designed for the 1771 Universal I/O chassis. It converts a nominal 24V DC source into the regulated 5V DC power required to drive the backplane and energized modules within a PLC 5 system. This module occupies two slots in the chassis and provides the robust electrical foundation necessary for distributed I/O and processor operations. We supply this hardware as 100% Brand New and Factory Original, offering a definitive solution for maintaining or expanding legacy PLC 5 infrastructures with zero-hour reliability.

Technical Specifications

The 1771-P5 utilizes efficient regulation circuitry to deliver high-amperage power across the 1771 backplane:

Engineering Advantages

• High-Capacity Backplane Delivery: This module delivers a continuous 8 Amperes of current at 5V DC directly to the 1771 backplane. This high power density supports chassis fully populated with complex analog or high-speed communication modules that demand significant current.

• Parallel Power Expansion: The 1771-P5 supports parallel configuration with additional 1771-P5 or 1771-P10 modules. This allows engineers to scale power capacity for oversized racks or implement redundancy to prevent system-wide shutdowns in the event of a single power supply failure.

• Wide DC Input Tolerance: The unit operates reliably within an input range of 20.5V to 30V DC. This wide window compensates for voltage drops in long-distance DC distribution runs and ensures stable PLC operation despite fluctuations in the primary 24V DC battery or power bus.

• Integrated Circuit Protection: An onboard 5A normal-blow fuse protects the internal components and the chassis backplane from overcurrent conditions. This sacrificial protection layer prevents catastrophic damage to expensive PLC 5 processors and I/O modules during electrical faults.

• Rugged Mechanical Integration: The 1771-P5 slides into any standard 1771 chassis, occupying two physical slots. The secure locking mechanism maintains electrical contact integrity even in environments subject to industrial vibration or mechanical shock.

FAQs

• Is the 1771-P5 unit 100% Brand New?

  Yes. We guarantee this power supply is 100% Brand New and arrives in its original Allen Bradley factory-sealed packaging. Every unit originates from original stock, ensuring that all internal capacitors and transformers provide their full engineered service life.

• Can I replace an AC power supply with this DC 1771-P5 model?

  The 1771-P5 requires a 24V DC input. While it fits the same mechanical 1771 chassis as AC models (like the 1771-P4), you must ensure your cabinet wiring provides the correct DC voltage. Switching from AC to DC power typically involves re-evaluating your cabinet’s power distribution and fuse sizing.

• Where should I install the 1771-P5 within the chassis?

  In most PLC 5 configurations, the power supply module resides in the leftmost slots of the 1771 chassis. However, the universal nature of the 1771 rack allows for flexibility; always verify that the total backplane current draw of your modules does not exceed the 8A rating of the 1771-P5.

• Does this module require a specific cable for connection?

  The 1771-P5 typically connects to the input power source using the 1771-CT cabling system. Proper termination is critical to ensure low-resistance paths for the 24V DC input current.