Overview
Allen-Bradley 1771-P4S Series B is a single-slot power supply module designed for the PLC-5/1771 industrial automation platform. This module delivers power to the backplane which is used by any Allen-Bradley 1771 modules to operate their individual circuitries. The power supply is capable of providing an output voltage of 5VDC and output current of 8 Amperes.
Key Features
- Input voltage requirement of 97–132VAC, 47–63 Hz
- Supports parallel cabling and pairing to another power supply unit for increased output
- Comes with a replaceable fuse: 1.5A, 250V Slow-blow
- Weighs 1.85 lbs (0.84 kg) and uses a 5-position terminal block
- Sealed industrial construction for reliable operation in harsh environments
- Includes certifications from CE, C-Tick, C-UL, and UL standards
Technical Specifications
- Input Voltage (Nominal): 120 Volts AC
- Input Voltage Range: 92–132VAC
- Input Frequency: 47–63 Hz
- Output Voltage: 5VDC
- Output Current (Max): 8 Amperes
- Fuse Rating: 1.5A, 250V Slow-blow
- Wire Size: 14 American Wire Gauge (AWG) single or solid wire only
- Operating Temperature: 0 to 60°C (32 to 140 °F)
- Storage Temperature: −40 to 85°C (−40 to 185 °F)
- Relative Humidity: 5–95%, non-condensing
- Weight: 1.85 lbs (0.84 kg)
- Mounting: Single I/O chassis slot
Typical Applications
The 1771-P4S is widely used in legacy PLC-5 systems and 1771-based automation platforms. Up to two of these supplies may be used as dictated by the power requirements of the 1771 series I/O modules contained in the Universal I/O Chassis. Common applications include industrial control systems, machine automation, process control, and equipment retrofits where reliable 5V backplane power is essential.
Compatibility & Replacements
Compatible With
- 1771-A1B, 1771-A2B, 1771-A3B, and 1771-A4B Universal I/O Chassis
- Allen-Bradley PLC-5 automation platform
- 1771 series I/O modules
- Power Supply Paralleling Cable (Allen-Bradley part number 1771-CT)
Replaces / Drop-In Replacement For
The 1771-P4S Series B directly replaces earlier revision models of the 1771-P4S. The 1771-P4S supports parallel operation with compatible modules like -LSP, -LWP, -XP, -ZP, or another P4S. For non-standard replacement scenarios, verify compatibility with your system integrator before ordering.
Works With
- 1771 family I/O modules (digital inputs, digital outputs, analog modules)
- Allen-Bradley PLC-5 processors
- 1771-CT parallel cabling for dual-supply configurations
- Standard terminal block wiring (5-position terminal block included)
