The Siemens 6ES7193-6BP00-2DU0 is a SIMATIC ET 200SP BaseUnit (BU20-P16+A0+2D, BU-TYPE U0) that provides the mechanical and electrical interface between an I/O module and the backplane bus. It creates a new potential group, meaning the / bus and AUX bus voltages are isolated from the left-side group — useful for separating control circuits or safety zones on a conveyor line without extra wiring. The unit is 20 mm wide, 117 mm high, and 35 mm deep, fitting the standard ET 200SP rail footprint. It accepts push-in terminals (0.14–2.5 mm² solid or 0.2–1.5 mm² with ferrule), which speeds field wiring compared to screw terminals — a practical advantage when commissioning multiple zones.
Bus Ratings and Potential Group Handling
The BaseUnit carries the / bus at 277 V and the AUX bus at 277 V, each rated for a maximum of 10 A (derating applies per module). The AUX bus is part of an equal potential group with / or PE, so you can feed auxiliary power to downstream modules without a separate supply line — common for powering sensors or actuators in a conveyor zone. It provides 16 process terminals to the I/O module and 2 terminals with connection to the / bus. There are no AUX bus terminals on this variant (0 terminals to AUX bus), so if you need auxiliary power distribution, you'd use a different BaseUnit type. The unit supports automatic encoding (HW FS10 and higher), which simplifies module replacement — the system reads the module ID without manual DIP switches.