ControlLogix 5570 / GuardLogix | Allen-Bradley | 1756-L71S Ser B GuardLogix Automation Controller AB 1756L71S

Product Description: Allen-Bradley 1756-L71S

The Allen-Bradley 1756-L71S is a GuardLogix controller from the ControlLogix 5570 series. It combines standard and safety logic capabilities in one chassis-based module, featuring 2 MB of user memory for standard logic and 1 MB of dedicated memory for safety logic. Designed for applications that require SIL 3 / PLe / Category 4 compliance, it provides integrated safety control using a dual-processor architecture.

Key Features

• 2 MB standard user memory
• 1 MB safety memory
• Dual-processor architecture for safety integrity
• Certified to SIL 3, PLe, and Category 4 functional safety standards
• Requires a 1756-L7SP safety partner module (sold separately)
• Supports integrated safety and standard control in a single project
• Compatible with GuardLogix safety I/O over EtherNet/IP
• Integrated USB 2.0 port for programming and diagnostics
• Programmed using Studio 5000 Logix Designer software

Technical Specifications

• Standard Memory: 2 MB
• Safety Memory: 1 MB
• Safety Rating: SIL 3, PLe, Cat 4 (when paired with 1756-L7SP)
• Motion Support: Up to 16 safety motion axes over EtherNet/IP
• Communication Ports: 1 x USB 2.0 (for programming/debugging)
• Requires separate communication module for network connectivity (e.g., 1756-EN2T)
• Power Consumption: 1.1 A @ 5.1V DC
• Battery: 1756-BA2 or Energy Storage Module (1756-ESMCAP / -ESMCAPK)
• Mounting: 1756 ControlLogix chassis
• Enclosure: Open type (IP20)
• Operating Temperature: 0°C to +60°C
• Certifications: UL, CE, cULus, TÜV, RoHS

Application Areas

• Safety-rated machinery and robotic cells
• Packaging, automotive, and heavy manufacturing
• Process industries requiring certified safety logic
• OEM equipment with embedded safety requirements
• Applications using EtherNet/IP safety I/O

Advantages

• Integrates safety and standard control in one module
• Reduces hardware complexity and panel footprint
• High-performance logic and safety processing
• Compliant with global functional safety standards
• Seamless integration with Logix-based automation systems