Allen-Bradley 1768-L45S Compact GuardLogix Safety Processor SEO Titles

Product Overview

The Allen-Bradley 1768-L45S is a Compact GuardLogix safety processor belonging to the L4x platform, combining standard control functionality with integrated safety task execution in a single DIN-rail mounted controller. As the safety-certified variant of the 1768-L45, the 1768-L45S provides 3 MB of standard user memory and 1 MB of dedicated safety memory, enabling it to manage both conventional automation logic and safety-rated functions within the same chassis . The “S” suffix distinguishes Compact GuardLogix controllers from their standard counterparts, and these safety models are physically wider than the non-safety L45 to accommodate additional circuitry required for safety certification .

The 1768-L45S is certified for use in applications up to Safety Integrity Level 3 (SIL 3) according to EN 62061/IEC 61508 and Performance Level e (PL e) under ISO 13849-1, employing a 1oo2 (one-out-of-two) safety architecture that provides redundant processing paths for safety-critical functions . The controller supports up to four local 1768 modules and can expand to a maximum of 30 1769 Compact I/O modules distributed across three I/O banks, making it suitable for mid-sized safety applications that require both standard control and safety-rated I/O in a compact footprint . Programming requires RSLogix 5000 version 18 or later, with standard tasks supporting all IEC-61131-3 languages while safety tasks are restricted to relay ladder logic and safety application instructions .

Rockwell Automation discontinued the 1768-L45S on October 30, 2020, and the entire 1768 CompactLogix platform has been superseded by the CompactLogix 5380 and Compact GuardLogix 5380 families . For existing installations, the 1768-L45S remains a critical spare for maintaining safety functions in packaging, material handling, and manufacturing cells where it was originally deployed.

Technical Specifications