Overview
The Allen-Bradley 1756-LSP is a GuardLogix safety partner processor designed as a co-processor module for the ControlLogix family. Unlike standalone safety controllers, the 1756-LSP pairs with a primary controller to create a redundant, isolated safety channel that meets SIL 3 and Performance Level (e) certification requirements. It operates within the CompactFlash-based 1756 chassis architecture and provides dedicated, deterministic safety-function execution.
Key Features
- Redundant safety co-processor providing isolated second channel for safety-related functions
- SIL 3 / Performance Level (e) certified for machinery safety and process control applications
- 250 connection capacity with dedicated safety memory (1 MB or 3.75 MB depending on paired primary controller)
- Compact single-slot module design; requires installation immediately adjacent to primary controller
- CompactFlash nonvolatile memory with built-in battery backup for clock and runtime data
- RS-232 communication port; integrated LED status indicators for real-time monitoring
Technical Specifications
- Power Consumption: 1200 mA @ 5.1V DC; 14 mA @ 24V DC
- Power Dissipation: 3.5 W; Thermal Dissipation: 11.9 BTU/hr
- Isolation Voltage: 30V continuous (basic insulation, type-tested to 720V DC for 60 seconds)
- Operating Temperature: 0–60°C (32–140°F); Non-operating: −40–85°C
- Humidity: 5–95% relative (non-condensing)
- Shock Rating: 30 g operating; 50 g non-operating
- Vibration: 2 g @ 10–500 Hz operating
- Dimensions: 27 × 17 × 7 cm (10.6 × 6.7 × 2.8 in)
- Weight: 0.7 lbs (0.32 kg)
- Memory: Safety memory 1 MB (L61S/L62S) or 3.75 MB (L63S); no user memory for standard tasks
- Mounting: 1756 ControlLogix chassis; single slot (occupies 2 slots as primary-partner pair)
- Safety Certification: SIL 3, PLe, Category 4
Typical Applications
- Industrial machinery safety systems (presses, assembly lines, conveyor interlocks)
- Food and beverage processing with safety interlocks and emergency stops
- Automotive manufacturing requiring redundant safety-function execution
- Packaging machinery with coordinated guarding and fault tolerance
- Process control systems requiring dual-channel safety logic
Compatibility & Replacements
The 1756-LSP is compatible with the 1756-L61S, 1756-L62S, and 1756-L63S primary GuardLogix controllers. It must be installed in the slot immediately adjacent (to the right) to the primary controller to meet SIL 3 requirements. The module pair occupies two consecutive chassis slots. Programming is performed via Rockwell Automation RSLogix 5000 (Studio 5000). Note: The 1756-LSP was discontinued by Rockwell Automation effective June 1, 2017. The 1756-L7SP is the functional replacement for new system designs; however, the 1756-LSP remains in-service and supported for legacy systems.
