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.