Allen-Bradley 1771-P4S PLC-5 Power Supply Module

Product Overview

The Allen-Bradley 1771-P4S serves as a high-current power supply module for the PLC-5 Universal I/O chassis. This module occupies a single slot and converts 120V AC utility power into a stabilized 5V DC output to drive backplane communication and module logic. It supports demanding I/O configurations by delivering a robust 8 Amp output current. We provide this unit as 100% Brand New and Original, ensuring your legacy infrastructure receives the stable voltage regulation required to prevent system crashes or data corruption.

Technical Specifications

The 1771-P4S features a compact 1-slot design with high-efficiency power conversion metrics.

Engineering Advantages

• Optimized Chassis Density: The 1771-P4S utilizes only one chassis slot, allowing engineers to maximize the remaining slots for high-density I/O or communication modules. This compact footprint solves space constraints in older, crowded electrical cabinets.

• Parallel Capability: This module supports parallel configurations with other 1771-P4S, -LSP, or -XP units. Paralleling these modules increases the total current available to the backplane, supporting expanded I/O racks without requiring external power distribution blocks.

• Superior Noise Rejection: The internal circuitry filters input line noise between 47 and 63 Hz. This protects sensitive PLC-5 processors from voltage spikes and harmonic distortions common in heavy industrial environments.

• Simplified Field Wiring: The module utilizes a 5-position terminal block supporting up to 14 AWG wire. This heavy-gauge capacity reduces voltage drop at the input and ensures a secure mechanical connection in high-vibration machinery zones.

FAQs

• Can I use the 1771-P4S to replace a 1771-P4 module?

  The 1771-P4S offers superior performance and parallel support. While it functionally replaces many older 1-slot supplies, always verify that your total backplane current draw does not exceed 8 Amps if using a single module.

• What is the purpose of the 1.5A slow-blow fuse?

  This fuse protects the internal transformer and circuitry from massive inrush currents and short-circuit conditions on the input side. If the module fails to power up, inspect this fuse first.

• How do I connect multiple 1771-P4S modules in parallel?

  You must use the 1771-CT cabling to link the modules. Paralleling allows the modules to share the load across the backplane, providing redundancy and increased total amperage for large-scale PLC-5 configurations.

• Does this module support DC input voltage?

  No. The 1771-P4S accepts a nominal 120V AC input only. For DC power requirements, you must select a different module from the 1771 power supply family specifically rated for DC input.