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Allen-Bradley 1756-L71/B ControlLogix Logix5571 Controller

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Allen-Bradley 1756-L71/B

by Allen-Bradley

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OverviewThe Allen-Bradley 1756-L71/B ControlLogix Logix5571 Controller is an advanced solution crafted for the rigorous demands of contemporary industrial automation. Engineered for peak reliability and expandability, this controller establishes a strong foundation for intricate systems, guaranteeing precise functionality and effective data management.With its generous 2 MB of user memory and 0.98 MB of I/O memory, the 1756-L71/B supports an impressive capacity of up to 128,000 digital I/O points and 4,000 analog I/O points. This extensive I/O capability, along with a handy USB 2.0 programming port, makes it an excellent option for integrating and managing large-scale automation architectures. Fully compatible within existing ControlLogix chassis, the 1756-L71/B delivers real-time processing power, enabling sophisticated motion control and high-speed communication across various industrial environments.This controller provides the adaptability and robust performance essential for critical operations, from manufacturing facilities to complex infrastructure systems, enhancing both output and operational efficiency. Its straightforward design facilitates effortless configuration and maintenance, making it a powerful yet user-friendly component in any advanced automation setup.Key Features 2 MB User Memory: Offers ample capacity for sophisticated control logic, extensive data storage, and complex program execution, ensuring peak performance for challenging applications. 0.98 MB I/O Memory: Facilitates streamlined and dependable management of large input/output systems, crucial for comprehensive industrial control. 128,000 Digital I/O Points: Supports a wide array of digital input and output devices, enabling high-capacity control and monitoring across vast systems. 4,000 Analog I/O Points: Allows for precise control and monitoring of analog signals, vital for applications demanding detailed measurement and adjustment. USB 2.0 Programming Port: Provides rapid data transfer speeds and simplified connectivity for fast programming, firmware updates, and diagnostic access, reducing downtime. High-Speed Data Processing: Optimized for demanding automation applications, delivering quick response times and efficient execution of critical tasks. Seamless ControlLogix Integration: Ensures complete compatibility within the Allen-Bradley ControlLogix ecosystem, simplifying system expansion and integration. Technical Specifications Model: 1756-L71/B Series: ControlLogix Logix5571 User Memory: 2 MB I/O Memory: 0.98 MB Digital I/O Capacity: 128,000 Points Analog I/O Capacity: 4,000 Points Total I/O Capacity: 128,000 Points (Digital) Communication Ports: 1 x USB 2.0 (Programming & Download) Chassis Compatibility: ControlLogix Operating Temperature: 0°C to 60°C (32°F to 140°F) Applications Large-Scale Industrial Automation: Ideally suited for managing extensive control architectures in large manufacturing facilities and processing plants. Manufacturing & Production Lines: Boosts efficiency and accuracy in real-time automation processes, optimizing production output and quality. Motion Control & Robotics: Enables high-speed and precise motion processing for robotic systems and automated machinery. Process Control Systems: Delivers accurate and efficient data handling for critical parameters in continuous and batch process environments. Energy & Utility Management: Optimizes complex automation operations in power generation, distribution, and utility infrastructure. Material Handling Systems: Ensures reliable and coordinated control for automated material transport and logistics. Why ChooseThis model stands out due to its exceptional features. The 1756-L71/B offers substantial memory and extensive I/O support, making it perfectly suited for the most demanding and interconnected industrial automation systems. Additionally, its convenient USB 2.0 port facilitates swift programming and data transfer, ensuring minimal interruption to operations.Order NowEnhance your industrial automation with the reliable and high-performing Allen-Bradley 1756-L71/B ControlLogix Logix5571 Controller. Contact us today to place your order and elevate your operational efficiency.FAQWhat is the available user memory on the 1756-L71/B controller?The 1756-L71/B controller features 2 MB of user memory.How many digital I/O points does this controller support?This controller supports up to 128,000 digital I/O points.What type of programming port is included?The controller includes a USB 2.0 programming port for fast data transfer and connectivity.Is this controller compatible with existing ControlLogix chassis?Yes, the 1756-L71/B seamlessly integrates into existing ControlLogix chassis.

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PRODUCT DETAILS

Allen-Bradley 1756-L71/B

Overview

This is a genuine Allen-Bradley component from the ControlLogix family. PalmPartsSolution stocks it in new, refurbished, and surplus condition with tested warranty and same-day shipping on in-stock units.

Whether you are sourcing a like-for-like replacement for an existing installation, an emergency spare to keep a line running, or a qualified part for a new build, our team can confirm availability, revision, and lead time before you order.

Key Features

  • Genuine Allen-Bradley catalog part
  • Tested before shipment
  • Backed by PalmPartsSolution warranty
  • Cross-reference and revision assistance available
  • Compatible with the broader Allen-Bradley automation ecosystem
  • Engineered to integrate inside ControlLogix installations

Compatibility

When ordering, match the full catalog/part number, hardware revision, and firmware revision called out by your Allen-Bradley equipment. Where applicable, confirm:

  • Input/output voltage and current rating
  • Communication protocol and network role
  • Mounting form factor and footprint
  • Operating temperature, humidity, and IP rating
  • Required certifications (UL, CE, ATEX, marine, etc.)

Not sure which revision you need? Send us the catalog number on the nameplate and we will confirm the correct match.

Replacement Information

Three ways to source this part through PalmPartsSolution:

  1. Exact replacement — same Allen-Bradley catalog number, new or refurbished, tested and warrantied
  2. Form-fit-function equivalent — alternate revision or build that drops in without code changes
  3. Engineered migration — current-generation Allen-Bradley platform with documented conversion notes for the ControlLogix family

Contact our engineering team if you need help choosing between these tracks.

Technical Specifications

  • Model: 1756-L71/B
  • Series: ControlLogix Logix5571
  • User Memory: 2 MB
  • I/O Memory: 0.98 MB
  • Digital I/O Capacity: 128,000 Points
  • Analog I/O Capacity: 4,000 Points
  • Total I/O Capacity: 128,000 Points (Digital)
  • Communication Ports: 1 x USB 2.0 (Programming & Download)
  • Chassis Compatibility: ControlLogix
  • Operating Temperature: 0°C to 60°C (32°F to 140°F)

Applications

  • Large-Scale Industrial Automation: Ideally suited for managing extensive control architectures in large manufacturing facilities and processing plants.
  • Manufacturing & Production Lines: Boosts efficiency and accuracy in real-time automation processes, optimizing production output and quality.
  • Motion Control & Robotics: Enables high-speed and precise motion processing for robotic systems and automated machinery.
  • Process Control Systems: Delivers accurate and efficient data handling for critical parameters in continuous and batch process environments.
  • Energy & Utility Management: Optimizes complex automation operations in power generation, distribution, and utility infrastructure.
  • Material Handling Systems: Ensures reliable and coordinated control for automated material transport and logistics.

Why Choose the 1756-L71/B?

This model stands out due to its exceptional features. The 1756-L71/B offers substantial memory and extensive I/O support, making it perfectly suited for the most demanding and interconnected industrial automation systems. Additionally, its convenient USB 2.0 port facilitates swift programming and data transfer, ensuring minimal interruption to operations.

Availability & Shipping

  • In stock: 1756-L71/B ready for immediate dispatch from our Florida warehouse.
  • Free USA shipping: FedEx Priority (2–5 business days) and UPS Ground (3–5 business days). Expedited options available at checkout.
  • Worldwide delivery: FedEx International Priority (1–5 days), UPS International Priority (3–5 days), and USPS International (5–10 days) — rates calculated at checkout.
  • Bulk pricing: Volume discounts on request — contact our sales team for quantity quotes.
  • Buy with confidence: Every 1756-L71/B ships with a 1-Year PALM Parts warranty and a 30-day return window.
SUPPORT

Frequently Asked Questions — Allen-Bradley

The 1756-L71/B controller features 2 MB of user memory.

Machine down? We ship parts the same day.

New, surplus, and refurbished Allen-Bradley inventory in stock. Request a quote or speak directly with an automation specialist for emergency sourcing.

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PALM Parts Solution operates as an independent industrial automation supplier and is not an authorized distributor or affiliate of any listed manufacturer or brand name. Manufacturer trademarks and product names are used solely for identification purposes. Original manufacturer warranties do not apply. All products sold by PALM Parts are backed by our own 1-year warranty.

Product Condition & Firmware

All products are sold as new unless stated otherwise. Original manufacturer packaging may show signs of handling, storage, or shelf wear. Date codes and series may vary from current factory production. PALM Parts does not guarantee the presence, version, or compatibility of any firmware on PLC or automation products.

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PALM Parts Solution sells used surplus products. PALM Parts Solution is not an authorized distributor, affiliate, or representative for the brands we carry. Products sold by PALM Parts Solution come with PALM Parts Solution's 1-Year Warranty and do not come with the original manufacturer's warranty. Designated trademarks, brand names and brands appearing herein are the property of their respective owners. This website is not sanctioned or approved by any manufacturer or tradename listed.

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