Configured for 100V AC main conversion and local logic voltage generation in 1771 I/O chassis, the Allen-Bradley 1771-P4S1 (1771-P4S1/A Power Supply) provides direct physical/electrical execution.

Hardware Identification & Revision Index

• Primary Catalog Number: 1771-P4S1
• Alternate Spare Codes: 1771-P4S1/A, 1771-P4S1/B
• Architecture Line: PLC-5 1771 Platform
• Functional Designation: Rack-Mount AC Input Power Supply Unit

Technical Parameters & Electrical Ratings

Deterministic Power Routing & Backplane Velocity Integration

The 1771-P4S1 conditions incoming 100V AC power into a regulated 5V DC bus rail to power backplane logic operations. Maintaining steady DC bus stability preserves backplane bus communication velocity across adjacent I/O slots while ensuring consistent firmware flash compatibility during intensive instruction execution cycles in PLC-5 architectures.

Package Dispatch Summary

• 1 x 1771-P4S1 Power Supply Module
• 1 x Printed Panel Installation Instruction Sheet

Cabinet Installation & Safety Guidelines

• Power Isolation: De-energize the main 100V AC feed and chassis backplane prior to inserting or removing the power module.
• Chassis Insertion: Align the unit with the guide rails in the designated left-most power supply slot of the 1771 chassis and slide until fully seated.
• Earthing Requirements: Connect the enclosure protective earth conductor to the main chassis grounding lug to mitigate electrical noise.

Frequently Asked Questions

• Q: What input voltage is required to operate the 1771-P4S1 power supply?

  The module requires a nominal 100V AC supply feed to generate internal DC backplane voltages.

• Q: What output voltage and current does the unit supply to the backplane?

  The 1771-P4S1 supplies a regulated 5V DC output rated for up to 8 A load current across the backplane bus.

• Q: What hardware revisions correspond to the spare codes 1771-P4S1/A and 1771-P4S1/B?

  These catalog numbers represent Series A and Series B factory revisions of the base 1771-P4S1 hardware.

• Q: Can the 1771-P4S1 module be installed or removed while the chassis is powered?

  No, inserting or removing the unit under live power can cause electrical arcing and damage backplane circuitry.

• Q: What are the physical dimensions of the unit for shipping calculations?

  The estimated shipping dimensions measure 3.2 x 15.5 x 26.8 cm with a package weight of 0.86 kg.

• Q: What standard operating ambient temperature range applies to this unit?

  The 1771-P4S1 operates reliably within an ambient panel environment temperature range of 0 to 60 deg C.

• Q: Does the 1771-P4S1 provide field-side power for external sensors?

  No, the 5V DC output is dedicated exclusively to supplying internal backplane logic for chassis modules.

• Q: Where is the 1771-P4S1 module manufactured?

  The 1771-P4S1 power supply module is manufactured in the United States.