Allen-Bradley 1768-L45S CompactGuardLogix Safety Controller

June 9, 2026 • 3 min read • wayne • Science

Product Summary

The powerful Allen-Bradley 1768-L45S CompactGuardLogix controller integrates both standard automation and safety control functions. It provides SIL 3 and PL e performance with 3 MB standard memory and 1 MB dedicated safety memory.

Product Procurement & Buyer Guide

This advanced controller serves high-integrity machine applications requiring up to SIL 3 and PL e certification. It implements a proven 1oo2 safety architecture for reliable machine and operator personnel protection. The processor supports up to thirty I/O modules across three separate expansion banks for flexibility. You can use four local 1768 I/O modules and thirty 1769 Compact I/O modules together. The controller offers 3 MB memory for standard automation tasks and 1 MB for safety tasks. This clear memory separation ensures robust isolation between control and safety logic functions. The module draws 2.1 Amps at 24 Volts DC directly from the backplane power supply. It dissipates 9.5 Watts and consumes 50.4 Watts of total electrical power during operation. These accurate specifications help engineers plan their power supply requirements with confidence.

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Expert Technical Evaluation & Performance Review

The 1768-L45S operates reliably within a temperature range of 0 to 60 degrees Celsius ambient. It can withstand non-operating temperatures from -40 to 85 degrees Celsius for storage. The controller handles 5g vibration at 10 to 500 Hz during normal operation cycles. It survives 30g operating shock and 50g non-operating shock events without damage. These robust ratings make it suitable for demanding industrial environments and applications. The module provides 30 Volts DC isolation voltage with functional insulation type certification. The RS-232 port withstands 500 Volts DC for 6 seconds during compliance testing. The module weighs only 0.45 kg with dimensions of 132 x 90 x 122 mm precisely. You can mount it on a panel or DIN rail for flexible installation options.

Installation Guidelines

Proper mounting requires specific clearance for adequate airflow around the controller unit. Leave 105 mm clearance above and below the controller for proper cooling. Leave 90 mm clearance on the left and right sides of the controller housing. This spacing maintains the required operating temperature range for reliable performance. You may install climate control devices like heaters or fans if needed. The controller supports two 1768 communication modules for diverse network connectivity needs. You can use Ethernet/IP, ControlNet, or DeviceNet modules for flexible networking. Safety and standard communication can coexist on the same network infrastructure seamlessly.