1756-L81ES | Allen-Bradley GuardLogix 5580 Safety Controller

Product Summary

The Allen-Bradley 1756-L81ES is a GuardLogix 5580 Safety Controller by Rockwell Automation, delivering integrated standard and safety control with SIL 3 / PLe certification. It features 5 MB standard memory + 2.5 MB safety memory, USB and Ethernet connectivity, and support for up to 128 axes of integrated motion. The controller operates in a single-slot 5580 chassis and supports modern EtherNet/IP-based I/O and device-level ring topologies.

Core Specifications

• Model Number: 1756-L81ES
• Type: GuardLogix 5580 Safety Controller
• Safety Rating: SIL 3 / PLe (Cat 4)
• Standard Memory: 5 MB
• Safety Memory: 2.5 MB
• Digital I/O Capacity: 128,000 points
• Analog I/O Capacity: 4,000 points
• Motion Axes: Up to 128 integrated motion axes
• Chassis Requirement: 1756 5580 chassis (single-slot controller)
• Communication: 1x USB 2.0 (programming); 1x EtherNet/IP (embedded)
• Programming: Studio 5000 Logix Designer v28 or later
• Manufacturer: Allen-Bradley by Rockwell Automation

Electrical & Functional Characteristics

• Backplane Current: 1.2 A at 5.1 VDC; 0.014 A at 24 VDC
• Power Dissipation: 6.2 W typical
• Task Types: Continuous, periodic, event, and safety tasks
• Safety Task Period: Configurable down to 6 ms
• USB Port: Full-speed USB 2.0 for local programming and firmware updates
• EtherNet/IP Port: 10/100/1000 Mbps auto-negotiating with DLR (Device Level Ring) support
• Status Indicators: RUN, FORCE, SD (safety disabled), SF (safety fault), I/O status, and Ethernet link LEDs

System Integration & Compatibility

• Primary Platform: ControlLogix 5580 chassis (1756-A4, -A7, -A10, -A13, -A17 in 5580 configuration)
• Safety I/O Modules: 1756-LSC8XIB8I, POINT Guard I/O, FLEX 5000 Safety I/O
• Motion Control: Integrated via EtherNet/IP with Kinetix 5700, 5500, 5300 drives
• Redundancy: Compatible with 1756-RM2 redundancy modules for high-availability safety systems
• Software Version: Studio 5000 v28 or later with GuardLogix safety license
• Related Parts: 1756-L81E (standard, non-safety), 1756-L82ES (10 MB + 5 MB safety), 1756-L83ES (20 MB + 10 MB safety), 1756-LSP (safety partner for SIL 3)

Environmental & Operational Limits

• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Storage Temperature: -40°C to +85°C (-40°F to 185°F)
• Humidity: 5% to 95% RH, non-condensing
• Vibration: 2G, 10 to 500 Hz
• Shock: 30G, 11 ms
• Approvals: TÜV Rheinland certified for SIL 3 / PLe, CE, UL, CUL, ATEX (Zone 2)

Industrial Applications

Widely deployed in automotive body and assembly, packaging with safety light curtains, robotic welding cells with safety zones, material handling with conveyor interlocks, process industries with emergency shutdown systems, and any application requiring integrated motion and certified safety in one controller.

Frequently Asked Questions

What is the difference between 1756-L81E and 1756-L81ES?

The 1756-L81E is a standard ControlLogix 5580 controller with 5 MB memory. The 1756-L81ES adds integrated safety functionality with 2.5 MB dedicated safety memory and SIL 3 / PLe certification.

Do I need a safety partner module?

For SIL 3 / PLe applications, the 1756-LSP safety partner module is required in an adjacent slot. Without the LSP, the controller operates at SIL 2 / PLd.

What software version do I need?

Studio 5000 Logix Designer v28 or later with the GuardLogix safety editor and appropriate safety task license.

Can this controller handle motion and safety together?

Yes — the 1756-L81ES supports up to 128 axes of integrated motion via EtherNet/IP while simultaneously executing safety tasks, making it ideal for coordinated motion + safety applications.

What are the related part numbers?

• 1756-L81E — ControlLogix 5580, 5 MB standard (non-safety)
• 1756-L81ES — GuardLogix 5580, 5 MB + 2.5 MB safety (this part)
• 1756-L82ES — GuardLogix 5580, 10 MB + 5 MB safety
• 1756-L83ES — GuardLogix 5580, 20 MB + 10 MB safety
• 1756-LSP — Safety Partner Module (required for SIL 3 / PLe)