Bosch Rexroth S20-BS-S IndraControl Bus Base Socket

The Bosch Rexroth S20-BS-S IndraControl Bus Base Socket is a compact interface module that connects narrow 35 mm wide I/O modules to the IndraControl S20 local bus, forming the essential link between the bus base and the I/O chain in an S20 station. Designed for IndraControl S20 configurations, this bus base socket carries the bus signals and power from the bus coupler or controller to the attached I/O modules and is part of Rexroth’s family of S20 bus base modules used to tailor stations for different housings and module types. The part number is R911173203, and Bosch Rexroth lists this item as a spare part for space-efficient I/O installations. In practice, the S20-BS-S is described as the socket that interfaces with narrow 35 mm I modules and, when paired with other S20 bus base modules, enables a modular, scalable IndraControl S20 system. The product is compatible with IndraControl XM21/XM22 configurations via S20 bus base assemblies, supporting a modular architecture where modules can be added along the S20 local bus. This socket is also advertised by some retailers as mountable on a top-hat rail, offering flexible mounting in control panels and cabinets.