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
Why 24V DC Power Supplies Standardize Modern Industrial Automation
Industrial control cabinets worldwide rely on 24V DC as the universal power standard for field instrumentation, sensors, and controllers. Walk into any manufacturing plant, and you will find PLCs, human-machine interfaces (HMIs), and smart actuators running on extra-low voltage DC. Standardizing on 24V DC enhances operational safety, lowers cabinet footprint, and maintains steady control performance across factory networks.
Essential Motion Control Commands: A Practical Guide for Engineers
Automation engineers often rely on precise position and speed control to drive modern factory machinery. Modern industrial systems, such as Programmable Logic Controllers (PLCs) and Distributed Control Systems (DCS), depend heavily on standardized motion instructions. Mastering these commands ensures operational safety, protects mechanical components, and optimizes cycle times across production lines.
Mastering Modern Industrial Joystick Controls in Heavy Automation
Industrial joysticks play a pivotal role in human-machine interaction across heavy material handling and mobile hydraulics. These tactile controllers translate complex operator movements into precise electrical signals for PLCs, motion controllers, and DCS networks. Consequently, selecting and installing the right joystick architecture ensures operator safety, reduces fatigue, and optimizes equipment performance.