Description

Allen-Bradley 1771-P6S/B PLC-5 High-Current Power Supply Module

The 1771-P6S/B is a chassis-mounted power supply designed for the Allen-Bradley PLC-5 system, converting 220V AC input into a stable 8A, 5V DC output for the backplane.

Technical Operational Overview

The 1771-P6S/B (Series B) serves as a primary power source for the Allen-Bradley 1771 Universal I/O chassis, providing the necessary DC voltage to drive processor and I/O logic. By occupying a single slot within the chassis, this module eliminates the need for external mounting while delivering a regulated +5V DC supply directly to the backplane. It specifically accommodates 220V AC nominal inputs, making it suitable for international industrial power standards.

Safety and data integrity remain central to the module’s design. The 1771-P6S/B features an integrated voltage monitoring circuit that constantly tracks the incoming AC line. If the voltage falls below the critical threshold of 194V RMS, the module triggers a systematic shutdown signal. This proactive measure ensures that the PLC-5 processor can perform orderly data storage and memory protection before total power loss occurs.

Key Technical Characteristics

• High Output Capacity: Delivers up to 8A of current at 5V DC, effectively supporting high-density I/O configurations within a single rack.
• Parallel Capability: Supports redundant or increased power setups by connecting two modules via a 1771-CT cable to reach a 16A total output.
• Intelligent Line Monitoring: Provides automatic brownout protection and shutdown signaling to preserve system memory.
• Local and Remote Sensing: Includes gold-plated jumper pins that allow users to select between local or remote voltage sensing for precise regulation.
• Visual Diagnostics: Features front-facing power status indicators that allow maintenance personnel to verify output health at a glance.
• Simplified Installation: Utilizes a 5-position removable terminal block for secure and rapid field wiring.

Product Specifications

Industrial Applications

The 1771-P6S/B is a foundational component for legacy PLC-5 infrastructures. Professionals typically deploy this module in:

• Large-Scale Manufacturing: Providing logic power for extensive I/O racks in automotive or assembly plants.
• Critical Process Control: Utilizing paralleled configurations for redundancy in chemical or power generation facilities.
• Legacy System Support: Maintaining existing 1771 Universal I/O chassis installations to ensure continued operational longevity.