AS-i A/B-Slave for Enclosure Mounting
The Siemens 3SF5500-0BB is an AS-i A/B-slave module providing 4 digital inputs and 3 digital outputs in a compact plastic enclosure rated IP20. The module is not safety-rated (Safety-Related = 0), so it is suited for general-purpose AS-i I/O, not safety-related control loops.
At 50.1 mm deep, 22.1 mm wide, and 71 mm tall, the 3SF5500-0BB occupies minimal panel space — roughly the footprint of a narrow terminal block. The 22.1 mm width allows dense packing on a DIN rail or mounting plate, though the specified fastening method is floor mounting, not snap-on DIN rail.