1.Product Overview​

The ​Allen-Bradley 1756-PBXT/B Power Supply​ is a high-capacity, redundant AC/DC power module engineered for Rockwell Automation's ControlLogix® systems in mission-critical industrial applications. Designed with dual-input redundancy (100–240V AC ±10%, 47–63Hz), this hot-swappable unit delivers ​10A continuous load​ at 5.1V DC to power ControlLogix chassis, including processors and I/O modules. Featuring ​auto-ranging voltage detection​ and ​PowerFlex™ technology, it maintains ±1% voltage regulation during brownouts (down to 85V AC) and supports seamless transfer between main/backup sources. The rugged enclosure meets NEMA Type 12/4X/13 standards with -40°C to +70°C operation and includes diagnostic LEDs for phase loss, overload, and thermal fault alerts.

2.​Critical Technical Specifications​

​Robust power performance metrics:

• ​Input Voltage: 100–240V AC (auto-sensing) / 85–264V DC (optional)
• ​Output: ​Isolated 5.1V DC​ @ 10A continuous (60W) / 13A peak (5s)
• ​Efficiency: 88% typical (Energy Star Level VI compliant)
• ​Protections: ​Full-brick redundancy​ + short-circuit/overvoltage/overcurrent safeties
• ​Hold-up Time: 20ms @ full load during power interruption
• ​Inrush Current: <45A (NTC-limited)
• ​Isolation: 3000V AC input-to-output / 1500V AC input-to-ground
• ​Certifications: UL 61010-1, ATEX Cat 3 Zone 2, CE, cULus, RoHS
• ​Harmonics: <10% THDi (EN 61000-3-2 Class A)

​3.Targeted Applications​

​Mission-critical power infrastructure:

• ​Energy SCADA Systems: Uninterrupted PLC control in substations during grid fluctuations
• ​Automotive Production: Robotic assembly line chassis power redundancy
• ​Chemical Plants: Batch reactor control systems requiring SIL 2 compliance
• ​Water Treatment: Pump station control cabinets exposed to humidity
• ​Food Processing: Washdown-rated environments (IP65 with optional kit)
• ​Pharmaceutical: Cleanroom manufacturing with EMI-sensitive equipment
• ​Data Centers: Industrial-grade UPS bridging for critical automation

​4.Competitive Advantages​

​Reliability-driven innovations:

• ​Zero Downtime Architecture: ​Hot-swap replacement​ without system shutdown
• ​Phase Loss Immunity: Continuous operation during single-phasing events
• ​Predictive Diagnostics: ​Temperature-compensated load forecasting​ alerts pre-failure
• ​Energy Optimization: 3-stage input filtering reduces EMI by 90% versus competitors
• ​Conformal Coating: Protects PCBs against corrosive atmospheres (H₂S/Cl₂)
• ​Cabinet Space Savings: 20% smaller than legacy 1756-Px modules
• ​Total Cost Reduction: 50,000+ hour MTBF decreases spare inventory costs

5.​Functional Capabilities​

​Advanced power management:

• ​Distributed Smart Charging: Priorities processor/I/O power during startup
• ​Voltage Sequencing: Controlled ramp-up prevents backplane surges
• ​Redundancy Support: Parallel operation with ​1756-PB75​ for 20A capacity
• ​Environmental Monitoring: Internal temp sensors adjust fan speed
• ​Field Calibration: Software-correction of voltage drift (±0.25%)
• ​Safety Integration: Compliant with ​NFPA 79 Arc Flash Reduction​
• ​Diagnostic Logging: Event-triggered power quality data via 1756-EN2T module

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Packaging & Shipping