Allen Bradley 1756-L81ESK GuardLogix Controller

The Allen Bradley 1756‑L81ESK is a GuardLogix 5580 safety-rated controller.

Technical Specifications

• Model: 1756‑L81ESK
• User Memory: 3 MB
• Safety Memory: 1.5 MB
• Ethernet: Embedded 1 Gb EtherNet/IP port
• USB Port: USB 2.0 (programming only)
• EtherNet/IP Nodes: Supports up to 100 devices
• I/O Capacity: Up to 128,000 digital & 4,000 analog points
• Power Consumption: ~5 mA @ 1.2 V; ~1.20 A @ 5.1 V
• Power Dissipation: 6.2 W
• Dimensions: ~5.46 × 18.29 × 23.75 cm; Weight ~0.53 kg
• Temperature: 0–60 °C operating; –40–85 °C storage
• Certifications: UL, CSA, CE, IECEx, ATEX, FM, KC, RCM, TÜV
• Conformal Coating: Yes (sealed communication ports)
• Lifecycle Status: Discontinued (End of Life December 31, 2026)

Key Features

• GuardLogix safety-certified logic with 1.5 MB dedicated memory
• High-speed embedded Ethernet and USB programming access
• Conformal coating ensures protection in harsh settings
• Supports integrated motion, redundancy, and safety architectures

Compatible Components & Accessories

• ControlLogix 5580 chassis and compatible power supplies
• Studio 5000 Logix Designer with integrated GuardLogix safety tools
• PanelView Plus HMIs and SD cards for application storage

Industry Applications

• Safety-critical control in manufacturing, process, and batch systems
• Pharmaceutical, food-grade, oil & gas, and water treatment automation
• Configurations requiring SIL 3 / PLe certified safety logic

Installation & Maintenance Notes

• Install only in GuardLogix 5580-compatible ControlLogix chassis
• Ensure unused Ethernet/USB ports remain sealed to preserve coating integrity
• Use USB port solely for programming—avoid continuous connection
• Must power down before inserting/removing SD card
• Follow chassis grounding and sheath cable shielding procedures

Frequently Asked Questions