Product Details
Product Overview
The 1756-PB50 serves as a high-capacity DC power supply specifically engineered for the Allen-Bradley ControlLogix platform. It converts a nominal 24V DC input into the multiple backplane voltages required by processors, I/O modules, and communication adapters within a 1756 chassis. This module provides the necessary current for high-density configurations, ensuring stable logic-side performance across the entire backplane. We supply this unit as 100% Brand New and factory-original, guaranteeing peak electrical efficiency and system integrity.
Technical Specifications
The 1756-PB50 utilizes a robust switching architecture to maintain stable outputs even during input voltage fluctuations.
| Feature | Specification |
| Input Voltage (Nominal) | 24V DC |
| Input Voltage Range | 18–32V DC |
| Backplane Current Capacity (5.1V) | 8A @ 50 °C / 6A @ 60 °C |
| Backplane Current Capacity (24V) | 2.5A @ 50 °C / 2.0A @ 60 °C |
| Max Inrush Current | 30 Amps |
| Isolation Voltage | 250V Continuous |
| Hold Up Time | 30ms @ 60W / 40ms @ 50W |
| Chassis Location | Left Side (Dedicated Slot) |
| Weight | 1.81 lbs (0.82 kg) |
Engineering Advantages
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Ride-Through Capability: The integrated capacitors provide a hold-up time of up to 40ms. This prevents nuisance controller resets during momentary DC bus brownouts or power transitions, maintaining process uptime in volatile power environments.
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High-Density Current Delivery: This module delivers a substantial 8A at the 5.1V backplane rail. This high output supports fully populated 17-slot chassis containing multiple high-drain communication modules and processors without requiring a secondary power source.
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Thermal Resiliency: The 1756-PB50 features advanced heat dissipation components. It operates at full capacity in ambient temperatures up to 50 °C and supports derated operation up to 60 °C, making it suitable for unconditioned industrial enclosures.
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Direct Chassis Integration: The unit snaps directly into the dedicated power supply slot on the left side of any standard 1756 ControlLogix chassis. This design eliminates external wiring for logic power and ensures a low-impedance connection to the backplane.
FAQs
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Can I use the 1756-PB50 in a redundant power supply configuration?
No. The 1756-PB50 is a standard power supply. For redundant applications, you must use the 1756-PB75R or 1756-PSCA2 adapter system. This module is intended for standalone chassis power.
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What type of fuse or circuit protection do you recommend for the input?
To protect against the 30A inrush current and potential short circuits, install a fast-acting fuse or a high-magnetic trip circuit breaker rated appropriately for the 24V DC supply line.
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Does this module provide power for field-side devices?
No. The 1756-PB50 only provides power to the chassis backplane for internal module logic. You must provide a separate 24V DC source to power field-side actuators, sensors, and I/O terminal blocks.
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How do I verify if the power supply is functioning correctly?
The front panel includes a green "DC Power" LED. If the LED is off, check the 24V DC input terminals for voltage and ensure the module is fully seated in the chassis.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
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Comprehensive Guide to PLC Types in Modern Industrial Automation
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Demystifying the DDE Protocol in Legacy Industrial Automation Systems
Modern control systems rely heavily on seamless interprocess communication to exchange operational data between software programs. Microsoft first introduced the Dynamic Data Exchange (DDE) protocol in 1987 to enable real-time data sharing. In factory automation, DDE served as an early bridge between control software and Windows desktop applications. Therefore, understanding DDE mechanics provides crucial insights into how legacy industrial networks established software-level connectivity.