Allen Bradley 1756-LSP GuardLogix Safety Partner Module

Product Summary

The Allen-Bradley 1756-LSP is a Safety Partner Module by Rockwell Automation, designed to pair with GuardLogix controllers to achieve SIL 3 / PLe safety ratings. It provides dual-processor redundancy and cross-checking functionality, working in tandem with the primary GuardLogix processor to ensure fail-safe operation in critical control applications.

Core Specifications

• Model Number: 1756-LSP
• Type: Safety Partner Module
• Safety Rating: SIL 3 / PLe (when paired with GuardLogix controller)
• Function: Dual-processor cross-checking and safety task execution
• Slot Requirement: Adjacent slot to GuardLogix controller in same chassis
• Backplane Current: 1.2 A at 5.1 VDC; 0.014 A at 24 VDC
• Power Dissipation: 6.2 W typical
• Manufacturer: Allen-Bradley by Rockwell Automation

Electrical & Functional Characteristics

• Redundancy Method: Dual-processor architecture with continuous cross-comparison of safety logic execution
• Safety Task Execution: Synchronized with primary GuardLogix processor; discrepancy detection triggers safe state
• Communication: Dedicated high-speed link to paired GuardLogix controller via backplane
• Status Indicators: RUN, FORCE, SD (safety disabled), SF (safety fault), and synchronization status LEDs
• Hot Swap: Not supported — system must be powered down for replacement

System Integration & Compatibility

• Compatible Controllers: 1756-L61S, 1756-L62S, 1756-L63S, 1756-L73S GuardLogix safety controllers
• Chassis Requirement: 1756-A4, -A7, -A10, -A13, -A17 ControlLogix chassis
• Slot Position: Must be installed in the slot immediately to the right of the GuardLogix controller
• Software: Studio 5000 Logix Designer v20 or later with GuardLogix safety license
• Safety I/O: Compatible with all GuardLogix-certified safety I/O modules

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

Industrial Applications

Widely deployed in automotive stamping and welding lines, packaging machinery with light curtains and e-stops, robotic cells with safety zones, material handling with conveyor interlocks, burner management systems, and process industries requiring emergency shutdown (ESD) and safety instrumented systems (SIS).

Frequently Asked Questions

What is the 1756-LSP used for?

It is a safety partner module that pairs with GuardLogix controllers to provide dual-processor redundancy, enabling SIL 3 / PLe safety certification.

Can I use a GuardLogix controller without the 1756-LSP?

Yes, but without the LSP the controller operates at SIL 2 / PLd. The LSP is required to achieve SIL 3 / PLe.

Where do I install the 1756-LSP?

It must be installed in the slot immediately to the right of the GuardLogix controller in the same chassis.

Can I hot-swap the 1756-LSP?

No — the safety partner module does not support removal and insertion under power (RIUP). The chassis must be powered down for installation or replacement.

What are the related part numbers?

• 1756-L61S — GuardLogix controller (2 MB + 1 MB safety)
• 1756-L62S — GuardLogix controller (4 MB + 2 MB safety)
• 1756-L63S — GuardLogix controller (8 MB + 4 MB safety)
• 1756-L73S — GuardLogix controller (16 MB + 8 MB safety)
• 1756-LSP — Safety Partner Module (this part)