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- - Allen‑Bradley 1756-PB72K ControlLogix DC Power Supply Module
    
    1756-PB72K Power Supply
    
    Product Overview
    
    The 1756-PB72K is a conformally coated 24V DC input chassis power supply for ControlLogix 1756 series PLC racks, installed on the far-left slot of the A/B series chassis. It converts external 24V DC control power into multi-voltage backplane power to feed the controller, communication cards, digital/analog I/O modules and other rack-mounted hardware. The conformal coating on circuit boards enhances protection against dust, humidity and corrosive gas for heavy industrial environmentsRockwell Automation.
    
    Core Specifications
    
    Input: Nominal 24V DC, operating range 18–32V DC; max input power 95W
    
    Rated output power: 75W continuous at 60°C ambient temperature
    
    Multi-channel backplane output ratings:
    
    5.1V DC: 10A
    
    3.3V DC: 4A
    
    1.2V DC: 1.5A
    
    24V DC auxiliary: 2.8A
    
    Hold-up time: 40ms under rated load; maximum inrush current 30A
    
    Isolation: 250V AC continuous isolation between input and backplane circuits
    
    Mechanical: Exclusive left-side chassis slot mounting; weight ~1.1kg
    
    Environment: Operating temperature 0°C ~ 60°C; humidity 5–95% non-condensing
    
    Protection: Built-in overvoltage, overcurrent, short-circuit and thermal shutdown protection
    
    Certifications: UL, cUL, CE; Class I Div 2 hazardous location compliant
    
    Feature difference vs standard 1756-PB72: PCB conformal coating for harsh corrosive workshops
    
    Main Functions
    
    Convert external 24V DC field power into multiple stable DC voltages for the ControlLogix rack backplane
    
    Supply operating power to Logix5580/5570 controllers, communication adapters, digital & analog I/O modules
    
    Provide isolated 24V auxiliary output for small field relays and indicator loads inside the cabinet
    
    Real-time self-monitoring of internal temperature, output voltage and current; trigger fault alarm via module status LED upon abnormal conditions
    
    Conformal coating blocks moisture, chemical mist and conductive dust to avoid PCB short-circuit and corrosion failure
    
    Key Advantages
    
    Conformal coated circuit board design improves reliability in humid, dusty, chemical corrosive industrial sites
    
    Wide 18–32V DC input range tolerates voltage fluctuation from unstable industrial 24V power sources
    
    Complete multi-layer protection circuit prevents damage to backplane modules during short-circuit or overload
    
    Standard plug-in chassis installation, quick replacement without reworking external input wiring
    
    Compact form factor fits standard ControlLogix 1756 chassis, supports full rack I/O expansion within 75W power budget