What this module is and where it fits
The Siemens 6ES7155-6AU01-0BN0XXX is an interface module that sits on the ET 200SP IO system, providing the PROFINET communication link to the controller. Listed as current production — no obsolescence watch needed for new builds. Footprint is 50 mm wide on the DIN rail, 117 mm tall, 74 mm deep. That 50 mm width matches a standard ET 200SP baseUnit slot width; verify the backplane bus connector spacing if retrofitting into an existing assembly. Ambient operating range is 0 to 60 °C, which covers most panel environments without forced cooling.