Product Overview

The Allen-Bradley 1756-LSP is a specialized safety partner module designed to work in tandem with GuardLogix L6 series primary controllers. By providing a redundant, isolated processing channel, this module enables ControlLogix systems to achieve high-level safety ratings, including SIL 3 and PLe (Performance Level e). The 1756-LSP functions as a co-processor, ensuring that safety-critical logic is executed with the highest degree of reliability and diagnostic coverage.

In a typical configuration, the 1756-LSP is installed in the slot immediately adjacent to the primary controller (such as the 1756-L61S, 1756-L62S, or 1756-L63S). While the primary controller manages standard tasks and safety logic, the 1756-LSP provides the necessary hardware redundancy to validate safety operations. This dual-processor architecture is essential for industrial environments requiring rigorous functional safety standards.

Technical Specifications and Capabilities

The 1756-LSP does not operate as a standalone unit; it utilizes the memory resources and communication infrastructure of its paired primary processor.

• Processor Compatibility: Exclusively for 1756-L61S, 1756-L62S, and 1756-L63S primary controllers.

• Safety Memory Allocation: 1 MB (with L61S/L62S) or 3.75 MB (with L63S).

• Current Draw: 1200mA at 5.1V DC; 14mA at 24V DC.

• Thermal Management: 3.5 Watts power dissipation; 11.9 BTU/hr thermal dissipation.

• Interface: Integrated RS-232 serial port for diagnostic connectivity.

• Non-Volatile Storage: Supports CompactFlash cards for project backup.

• Safety Rating: Achieving SIL 3 according to IEC 61508 and PLe/Cat. 4 per ISO 13849-1 when paired correctly.

Environmental and Physical Attributes

Built for demanding industrial settings, the module features robust vibration and shock resistance.

• Operating Temperature: 0°C to 60°C (32°F to 140°F).

• Storage Temperature: -40°C to 85°C (-40°F to 185°F).

• Relative Humidity: 5% to 95% (non-condensing).

• Shock Rating: 30g (operating); 50g (non-operating).

• Physical Dimensions: 3.5 x 14.2 x 14.5 cm.

• Weight: 0.36 kg.

Installation Requirements

To maintain safety integrity, the 1756-LSP must be mounted in the same ControlLogix chassis as the primary GuardLogix controller. It occupies a single slot, but the complete safety controller pair requires two contiguous slots. The module is compatible with any standard 1756 ControlLogix chassis and power supply.