Allen-Bradley 1771-P4S1
Allen-Bradley 1771-P4S1
Allen-Bradley 1771-P4S1
Allen-Bradley 1771-P4S1
Allen-Bradley 1771-P4S1
Allen-Bradley 1771-P4S1
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1771-P4S1

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The Allen Bradley 1771-P4S1 is a dedicated 5V DC backplane power supply module for the PLC-5 platform, designed to operate on a 100V AC nominal input with an 8A output capacity in a single-slot 1771 chassis.
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Technical specifications for 1771-P4S1

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1771-P4S1
  • Product Family:
    PLC-5
  • Product Type:
    Power Supply Module
  • Stock:
    1
  • Slot Width:
    1 Slot
  • Nominal Input Voltage:
    100V AC
  • Input Voltage Range:
    85 – 120V AC (47 – 63 Hz)
  • Input Current:
    1.06 Amps (max)
  • Max Real Input Power:
    56 Watts
  • Apparent Power:
    89 VA
  • Output Voltage:
    5.06V DC (±3/6% tolerance)
  • Backplane Output Current:
    8 Amps
  • Power Dissipation:
    16 Watts (Max)
  • Thermal Dissipation:
    47.8 BTU/hr
  • Adjacent Slot Dissipation:
    10 Watts (Max limit) Terminal
  • Torque:
    0.5 Nm
  • Operating Temperature:
    0 to 60 °C (32 to 140 °F)
  • Storage Temperature:
    -25 to 80 °C (-13 to 176 °F)
  • Humidity:
    5-95% Non-condensing
  • Weight:
    0.86 kg
  • Estimated shipping dimensions:
    3.2x15.5x26.8cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Applications Operating Environment Monitoring & Control

Features:

  • High-Density Backplane Power in 1 Slot
  • Scalable Parallel Redundancy (Current Sharing)
  • Serviceable Design with "P/S ACTIVE" Diagnostics
The Allen Bradley 1771-P4S1 delivers a robust 8 Amps of pure 5V DC power directly to the 1771 backplane. This supports dense configurations of 16-point or 32-point high-drain I/O modules without voltage drop, ensuring stable operation in high-speed logic scanning environments.

For systems requiring more than 8A or enhanced load balancing, the Allen Bradley 1771-P4S1 supports parallel operation. By installing two units and linking them with the 1771-CT cable, the system can distribute the load across two slots, preventing single-point thermal stress and extending MTBF.

Unlike sealed units, the Allen Bradley 1771-P4S1 features a field-replaceable slow-blow fuse and a direct visual "P/S ACTIVE" LED. This indicator provides instant validation of backplane regulation, distinguishing between input power loss and internal overcurrent shutdown.

The 1771-P4S1 Allen Bradley PLC-5 100V AC Input 8A Output Standard Power Supply Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen Bradley 1771-P4S1 PLC-5 100V AC Input 8A Output Standard Power Supply Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Allen Bradley 1771-P4S1 PLC-5 100V AC Input 8A Output Standard Power Supply Module

General

  • Manufacturer Allen Bradley
  • Model 1771-P4S1
  • Condition New Original ready stock
  • Product Family 1771-P4S,1771-P4R,1771-P4
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Legacy PLC-5 System Sustainment: Direct drop-in replacement for P4 series supplies in 1771-A1B/A2B/A3B/A4B racks to keep legacy lines running.
  • Remote I/O (RIO) Farms: Powers communication adapters (1771-ASB/ACN) and discrete I/O in remote cabinets away from the main processor.
  • Mixed I/O Density Configurations: Supports systems mixing 8-point, 16-point, and high-power specialty modules (analog/thermocouple) requiring stable 5V rails.
  • Machine Tool Retrofits: Provides the clean 5V logic power required when modernizing control cabinets but retaining existing 1771 wiring and termination arms.
  • Industrial Enclosures: Open-style design (IP20) requires installation in a NEMA rated enclosure protecting against dust and conductive debris.
  • Controlled Thermal Zones: Relies on chassis convection cooling; requires 25mm (1 in.) clearance above and below for airflow to maintain 0-60°C operation.
  • Low Voltage Power Distribution: Designed for isolated mains supplies; requires external branch circuit protection (max 15A) per NEC/CEC.
  • Humidity Resilience: Survives 95% non-condensing humidity, suitable for un-air-conditioned pump rooms or food processing prep areas (non-washdown).
  • P/S ACTIVE Status Indication: Single green LED confirms 5V DC backplane regulation is active and within tolerance.
  • Parallel Diagnostics: When paralleled via 1771-CT, the units communicate fault status; if one fails, the secondary unit attempts to maintain load but signals a fault state.
  • Remote Fault Detection: Integrates with I/O chassis backplane; a loss of +5V (LED off) typically triggers a "Rack Fault" bit in the PLC-5 processor's status file.
  • Predictive Maintenance: Monitoring the 1.5A slow-blow fuse; frequent failure indicates high inrush current or backplane short, allowing technicians to replace the fuse without soldering.
Description
The Allen Bradley 1771-P4S1 is engineered specifically for the legacy PLC-5 universal I/O chassis (1771-A1B through -A4B). Unlike standard industrial power supplies, this module mounts directly inside the I/O rack, converting 100V AC industrial power into regulated 5V DC for the backplane to support processors, communication adapters, and I/O modules.

As a "Series B" revision, the Allen Bradley 1771-P4S1 offers enhanced thermal management and supports parallel operation. When used with a 1771-CT paralleling cable, two units can share the load, allowing expansion into a second chassis slot to meet high-density I/O power demands.

Designed in an "Open Style" format, the Allen Bradley 1771-P4S1 relies on proper enclosure cooling rather than self-housing. It features field-replaceable fuses and straightforward LED diagnostics ("P/S ACTIVE"), making it a field-maintainable solution for brownfield expansions or hot spare setups.
Revisions

Revision Part #

Also known as

1771-P4S1 Ser A
1771-P4S1/A, Series A, Rev A
1771-P4S1 Ser B
1771-P4S1/B, Series B, Rev B
Alternative Names
1771P4S1 I77I-P4SI 177I-P4S1 177IP4S1 1771-P4S 1771-P4R 1771-P4 1771-IM
Technical notes
The Allen Bradley 1771-P4S1 specifically requires 100V AC nominal input (operating range 85-120V AC) and provides 8 Amps at 5V DC. Critical Note: Verify chassis series compatibility; in Series A chassis, auxiliary modules like this may require specific slot placement (e.g., Slot 8 for 1771-A4).
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What are the specific IEC 61131-2 environmental limits for operation of the Allen Bradley 1771-P4S1?
The Allen Bradley 1771-P4S1 is rated for an operational temperature range of 0 to 60 °C (32 to 140 °F) with a relative humidity of 5-95% non-condensing. It is tested to withstand 2g vibration (10-500Hz) and 30g shock, complying with IEC 60068-2-6.
How do I correctly wire the Allen Bradley 1771-P4S1 for 100V AC input, and which specific terminal block does it require?
To wire the Allen Bradley 1771-P4S1, use a 5-position terminal block (P/N 941274-55 or Wago 231-002/027-000). Connect AC mains to the designated terminals using 14 AWG copper wire only (solid or stranded) with a screw torque of 0.5 Nm. Ensure the
Can I parallel two units of the Allen Bradley 1771-P4S1 in a redundant chassis configuration for increased capacity?
Yes. To increase capacity, install two units of the Allen Bradley 1771-P4S1 in the same chassis and connect them via the 1771-CT paralleling cable. Critical Note: This provides current sharing for expansion, not true
The Allen Bradley 1771-P4S1 is obsolete; what safety certifications remain valid for my plant audit?
The Allen Bradley 1771-P4S1 retains UL Listed (Industrial Control Equipment), c-UL (Class I, Div 2 Hazardous Locations), and CE (EMC Directive 89/336/EEC & Low Voltage Directive 73/23/EEC) marks, provided the unit is maintained in its original specification.
The Allen Bradley 1771-P4S1 is labeled for 100V AC nominal, but my facility has a 120V AC supply. Is the voltage compatible?
Yes. The Allen Bradley 1771-P4S1 has a wide operating range of 85-120V AC (47-63 Hz). It is specifically labeled 100V nominal for Japanese and specific Asian markets, but it functions perfectly on standard 110V-120V US industrial mains without any adjustment or performance degradation.

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