1756-L71S | Allen-Bradley | GuardLogix 5571S | Safety Automation Controller

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

• Manufacturer: Allen-Bradley

• Product Line: ControlLogix / GuardLogix 5570 Series

• Part Number: 1756-L71S

• Weight: 0.56 lbs (0.26 kg)

• Module Type: Processor Module

• User Memory: 2 MB

• Safety Memory: 1 MB

• Nonvolatile Memory: 1 GB CompactFlash (included)

• I/O Capacity (Max): 128,000 digital I/O, 4,000 analog I/O

• Standard Tasks: Up to 31

• Safety Tasks: 1 dedicated safety task

• Programs per Task: 100 programs

• Event Tasks: Supports all trigger types

• Built-in Communication: 1 USB port

• Optional Communication Adapters: EtherNet/IP, ControlNet, DeviceNet

• Redundancy: Not supported

• I/O Memory: 0.98 MB

• Current Draw @ 1.2 VDC: 5 mA

• Current Draw @ 5.1 VDC: 800 mA

• Power Dissipation: 2.5 W

• Thermal Dissipation: 8.5 BTU/hr

• Isolation Voltage: 30 V continuous (basic insulation type)

• Enclosure Rating: Open-style (no enclosure)

Application Scenarios

• Safety-Critical Automation: Ideal for applications requiring integrated safety control alongside standard automation tasks

• Large-Scale Systems: Supports extensive I/O capacity for complex manufacturing and process environments

• Flexible Integration: Compatible with multiple communication adapters for diverse industrial networks

FAQ

• 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.

• Q: Does this controller support redundancy?  A: No, redundancy is not supported in this model.

• Q: How many programs can run per task?  A: Each task can support up to 100 programs.

• Q: What communication options are available?  A: Built-in USB plus optional EtherNet/IP, ControlNet, and DeviceNet adapters.

• 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.