Overview
The Allen-Bradley 1756-LSP is a GuardLogix Safety Partner co-processor module designed for the 1756 ControlLogix family. It serves as a redundant safety channel that is isolated for the system’s safety-related functions. This module implements safety functions compliant up to SIL 3 and Performance Level (e) applications. Unlike standalone safety controllers, the 1756-LSP integrates seamlessly into existing ControlLogix architectures, allowing standard and safety logic to coexist within a single control system.
Key Features
- Integrated Safety Architecture: Enables the controller assembly to comply up to SIL 3 rating without requiring a separate safety controller
- Redundant Co-Processor Design: Functions as a co-processor, enabling a dedicated and isolated processor for safety functions
- Compatible Primary Controllers: Works with 1756-L61S, 1756-L62S, and 1756-L63S primary controllers
- Scaled Safety Memory: Safety memory is 1MB with L61S/L62S or 3.75 MB with L63S
- High Connection Count: Handles 250 controller connections
- RS-232 Serial Interface: Built-in serial port for device communication and diagnostics
Technical Specifications
- Power Supply (Backplane): Current draw 1200 mA at 5.1V DC; 14 mA at 24V DC
- Power Dissipation: 3.5 W with thermal dissipation of 11.9 BTU/hr
- Isolation Voltage: Continuous 30V basic insulation, type-tested from RS-232 port-to-system at 720V DC for 60 seconds
- Operating Temperature: 0–60 °C
- Non-Operating Temperature: −40 to 85 °C
- Relative Humidity: 5–95% non-condensing
- Operating Shock: 30 g; non-operating 50 g
- Operating Vibration: 2 g at 10–500 Hz
- Mounting: Single-slot module occupies 2 chassis slots when paired with primary controller
- Memory Card Compatibility: CompactFlash
- Certifications: UL, c-UL-us, CE, CSA, C-Tick, FM, ATEX, certified by TÜV for Functional Safety
Typical Applications
The 1756-LSP is best suited for PLE safety applications and SIL 3 safety applications, used as the safety partner device within a complete GuardLogix system where it operates alongside a primary GuardLogix controller module. Common uses include machinery emergency stop logic, process interlocks, personnel safety gates, and safety-rated motion control. It is widely deployed in food processing, automotive assembly, packaging, and chemical manufacturing where redundant safety control is mandated by risk assessment.
Compatibility & Replacements
The 1756-LSP is compatible with 1756-L61S, 1756-L62S, and 1756-L63S primary controllers. As of June 1, 2017, the product is discontinued with the functional replacement being the 1756-L7SP. Integrates with all 1756 I/O modules (digital input/output, analog, specialty). Programming is performed in Studio 5000 Logix Designer with SafetyLogix for the safety task. The module ships with a 1756-BA2 lithium battery that backs up CompactFlash memory in case of power failure and can be replaced when depleted.
