Application Scenarios
In a high‑speed automotive assembly line, unplanned downtime costs thousands per minute. A plant experienced random controller resets during peak production hours, traced to voltage sags from nearby robotic welding cells. By deploying the 1756-PA75/B with its wide input voltage tolerance (85‑265V AC), the system maintained stable logic power even during 30% voltage dips. The module’s robust design and integrated protection prevented damage from electrical noise and transients, eliminating the resets and securing the critical control loop.
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | 1756-PA75/B |
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Product Category | ControlLogix AC Power Supply |
| Input Voltage | 85‑265V AC (47‑63 Hz); jumper-selectable 120/240V nominal |
| Output Power | 75W total (combined 5.1V & 24V rails) |
| Output Voltages | +5.1V DC @ 14.0A (logic), +24V DC @ 1.0A (I/O point/sensor) |
| Hold-up Time | ≥20 ms (allows controller time to save state during blackout) |
| Efficiency | >80% (typical) |
| Protection | Electronic current limiting, over-temperature shutdown, auto-recovery |
| Status Indication | Green OK LED, Red FAULT LED |
| Operating Temp | 0 °C to 60 °C (32 °F to 140 °F) |
| Redundancy | Supports N+1 via 1756-CPR cable (with second 1756-PA75 or 1756-PB75) |
| Installation | 1756 chassis left-most slot only; requires 1756 chassis (e.g., 1756-A4, 1756-A7) |
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