Product Details
Product Description
The Allen-Bradley 1756-L71S GuardLogix 5571S Controller is a high-performance safety-certified processor module within the ControlLogix family. It combines standard automation control with integrated safety functions, making it suitable for complex applications requiring both high capacity and SIL-rated safety features.
Technical Specifications
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Manufacturer: Allen-Bradley
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Product Line: ControlLogix / GuardLogix 5570 Series
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Part Number: 1756-L71S
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Weight: 0.56 lbs (0.26 kg)
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Module Type: Processor Module
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User Memory: 2 MB
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Safety Memory: 1 MB
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Nonvolatile Memory: 1 GB CompactFlash (included)
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I/O Capacity (Max): 128,000 digital I/O, 4,000 analog I/O
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Standard Tasks: Up to 31
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Safety Tasks: 1 dedicated safety task
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Programs per Task: 100 programs
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Event Tasks: Supports all trigger types
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Built-in Communication: 1 USB port
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Optional Communication Adapters: EtherNet/IP, ControlNet, DeviceNet
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Redundancy: Not supported
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I/O Memory: 0.98 MB
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Current Draw @ 1.2 VDC: 5 mA
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Current Draw @ 5.1 VDC: 800 mA
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Power Dissipation: 2.5 W
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Thermal Dissipation: 8.5 BTU/hr
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Isolation Voltage: 30 V continuous (basic insulation type)
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Enclosure Rating: Open-style (no enclosure)
Application Scenarios
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Safety-Critical Automation: Ideal for applications requiring integrated safety control alongside standard automation tasks
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Large-Scale Systems: Supports extensive I/O capacity for complex manufacturing and process environments
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Flexible Integration: Compatible with multiple communication adapters for diverse industrial networks
FAQ
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Q: What distinguishes the 1756-L71S from standard ControlLogix controllers? A: The 1756-L71S includes dedicated safety memory and tasks, making it suitable for GuardLogix safety applications.
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Q: Does this controller support redundancy? A: No, redundancy is not supported in this model.
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Q: How many programs can run per task? A: Each task can support up to 100 programs.
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Q: What communication options are available? A: Built-in USB plus optional EtherNet/IP, ControlNet, and DeviceNet adapters.
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Q: How does this compare to the 1756-L72S? A: The 1756-L71S offers 2 MB user memory, while the 1756-L72S provides 4 MB, making the latter better suited for larger applications.
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
Understanding Root Causes of Unplanned PLC Stop Mode in Industrial Automation
Modern Programmable Logic Controllers manage execution through distinct operational states: Run, Stop, Start-Up, and Hold. During power-up, a controller initializes memory registers within Stop mode before briefly transitioning to Start-Up mode. During this phase, internal self-diagnostics evaluate system integrity across hardware and user programs. If the controller detects no critical faults, it enters Run mode to execute the control program continuously. However, any severe system anomaly forces the CPU back into Stop mode immediately to prevent erratic machine behavior across the plant floor.
Human-Machine Interface Design: Essential Guide to HMI Selection, Visualization, and Control System Integration
Human-Machine Interfaces (HMIs) serve as the primary operational window into complex industrial automation systems. Modern HMIs convert raw machine data into clear graphical displays, enabling operators to oversee entire manufacturing processes in real time. Instead of relying on physical control panels full of hardwired switches, engineers program interactive screens using intuitive graphics, dynamic color coding, and responsive touch interfaces. Over my 15 years in control systems engineering, I have observed HMIs transform from basic display screens into sophisticated command centers that drive operational efficiency across DCS and PLC environments.
Understanding Safety Relays in Industrial Automation: Architecture, Operation, and Functional Safety
Standard electromechanical relays provide basic electrical isolation between low-voltage control circuits and high-power output loads. A traditional switching relay features a magnetic coil driving mechanical Common (COM), Normally-Open (NO), and Normally-Closed (NC) contacts. However, standard relays pose severe functional risks when deployed in critical safety interlock circuits. High current inrush or mechanical wear can weld contacts together permanently. If contact welding occurs in an emergency stop circuit, pressing the button fails to halt hazardous machinery movements. Consequently, global functional safety standards prohibit standard relays for critical machine guarding functions.