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The Allen-Bradley 1754-L28BBB is a robust 28 I/O safety controller within the GuardPLC 1200 Control System line, designed to meet IEC 61508 (SIL 3) and ISO 13849-1 (PLe/Cat. 4) standards for fail-safe operations. It features 20 digital inputs, 8 digital outputs, and 2 high-speed counters, ensuring prompt fault detection and response to maintain safety functions. Equipped with RS-232 and Ethernet ports for communication and programming, it includes front-panel indicators for status monitoring and a conveniently accessible backup battery compartment. Operating on a 24 Volt DC power supply with a capacity of at least 8 Amps, this compact unit measures 160 mm x 112 mm x 90 mm and weighs 0.68 kg.