Product Overview

The 1771-P6S/B is a specialized slot-based power supply designed for the Allen-Bradley 1771 Universal I/O chassis. This module functions by converting a nominal 220V AC input into a regulated 8-Amp, 5V DC output directly to the chassis backplane. Unlike external power units, this module resides within the I/O rack itself, saving critical cabinet space and streamlining the electrical architecture of PLC-5 control systems.

Engineered for continuous industrial duty, the 1771-P6S Series B provides the essential current required for complex I/O configurations. Its primary role is to ensure that the processor and various input/output modules receive a stable, noise-filtered voltage supply, which is fundamental for maintaining the integrity of high-speed logic operations.

System Safety and Diagnostic Capabilities

To protect the automation system from unpredictable power quality, the 1771-P6S/B features an integrated under-voltage detection circuit. If the incoming AC line drops below approximately 194V RMS, the module triggers a proactive shutdown signal. This safety mechanism allows the PLC-5 processor to save critical data and perform an orderly system halt, preventing the memory corruption that often occurs during brownout conditions.

Monitoring is facilitated via front-panel status indicators that provide immediate visual confirmation of the DC output health. Furthermore, the hardware supports remote sensing capabilities, allowing the unit to detect and compensate for potential voltage drops across the backplane, ensuring that distant modules in a large chassis receive the full required voltage.

Power Expansion and Redundancy

For systems with heavy current demands, the 1771-P6S/B supports parallel operation. By utilizing a 1771-CT cross-over cable, two modules can be linked to deliver a combined total of 16 Amps to a single chassis. This configuration not only doubles the available power but also introduces a layer of operational redundancy, increasing the overall reliability of the manufacturing process.

Technical Specifications

• Input Voltage: 220V AC (Nominal)

• Input Voltage Range: 194V to 264V AC

• Input Frequency: 47 to 63 Hz

• Backplane Output: 8 Amps @ 5.1V DC

• Slot Requirement: Single slot in 1771 I/O Chassis

• Cooling: Natural Convection

• Isolation: 1500V RMS (Input to Backplane)

• Power Dissipation: 24 Watts (Maximum)

• Typical Real Power: 58 Watts

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Dimensions: 14.5 x 13.0 x 3.5 cm

• Weight: 0.9 kg