Overview
The Allen-Bradley 1756-PB72 is a standard ControlLogix power supply module designed to provide stable, regulated DC power to the 1756 chassis backplane and connected modules. Operating at a nominal 24V DC input, the 1756-PB72 accepts a wide input range of 18–32V DC and delivers up to 75W of combined output power across multiple voltage rails (1.2V, 3.3V, 5V, and 24V). This module is purpose-built for PLCs, drives, I/O modules, and other industrial automation components requiring reliable, multi-voltage power distribution in factory automation and motion control systems.
Key Features
- 75W maximum output power across all rails combined, sufficient for mid-sized ControlLogix systems
- Wide input voltage range (18–32V DC) tolerates field power variations and surge conditions
- Multi-voltage output: 1.2V, 3.3V, 5.1V, and 24V DC rails for diverse module requirements
- 30A inrush current rating for reliable startup without nuisance trips or voltage sag
- Reinforced insulation and 250V continuous isolation voltage for enhanced safety and EMC performance
- Open-frame chassis-mount design integrates seamlessly into standard 1756 backplane installations
- LED status indicators provide real-time operational feedback
- International certifications: CE, CUL, CSA, KC, NRTL, RCM, MARINE, CCC
Technical Specifications
- Input Voltage (nominal): 24V DC
- Input Voltage (range): 18–32V DC
- Maximum Output Power: 75W (all rails combined)
- Maximum Input Power: 95W
- Output Current (3.3V rail): 4A
- Output Current (5.1V rail): 10A
- Output Current (24V rail): 2.8A
- Inrush Current: 30A peak
- Isolation Voltage: 250V continuous (reinforced insulation)
- Operating Temperature: 0–60°C
- Enclosure: Open-frame (no cover)
- Mounting: Chassis-mount (1756 backplane)
- Weight: Approximately 1.54–2.7 lbs
- Certifications: CE, CUL, CSA, KC, NRTL, RCM, MARINE, CCC
- Series: ControlLogix Standard Power Supply
Typical Applications
- ControlLogix chassis-based PLC systems requiring standard 75W power distribution
- Industrial automation projects with mixed low-voltage module requirements (1.2V, 3.3V, 5V, 24V)
- Motion control systems using ControlLogix drives, encoder modules, and I/O blocks
- Factory floor machinery integrating Allen-Bradley logic controllers and distributed I/O
- Process control installations where reliable, isolated multi-voltage power is critical
- Retrofit and expansion of existing ControlLogix configurations
Compatibility & Replacements
Compatible With
- Allen-Bradley 1756 ControlLogix chassis (all standard sizes: 1, 2, 4, 7, 10, 13-slot)
- ControlLogix processors (L5x, L6x, L7x, L8x families)
- ControlLogix I/O modules, scanner modules, and communication adapters
- EtherNet/IP, PROFINET, DeviceNet, and ControlNet networks via ControlLogix modules
- Studio 5000 Logix Designer engineering software
- Allen-Bradley safety modules and distributed I/O nodes
Replaces / Drop-In Replacement For
- 1756-PB72 Series A and Series B units (backward-compatible form/fit/function)
- Older ControlLogix power supplies with similar 75W output and 18–32V input requirement
- Verify compatibility with your system integrator before ordering to ensure proper fit and electrical matching.
Works With
- Studio 5000 Logix Designer (engineering and simulation)
- EtherNet/IP network modules and protocols
- PROFINET I/O communication modules
- DeviceNet adapter modules
- ControlNet adapter modules
- Allen-Bradley CompactLogix and GuardLogix accessories (via external 24V supply)
