Base unit (BU30-MS9) with F-DI forwarding for ET 200SP motor starters without power supply BaseUnit SIMATIC ET 200SP for incorporating the ET 200SP motor starters into the ET 200SP system including power supply and communication interface.The BaseUnit enables easy installation and reduces wiring to a single power supply. The robust design and the form-fitting connection technology enable use in harsh industrial environments.The BaseUnits are available with various power supplies for the motor starters.The ET 200SP decentralized I/O system replaces the proven ET 200S system.ET 200SP motor starter - flexible. Powerful. Space-saving.