The Siemens 6SL3260-2TA00-0AA0 is a backplane bus module, 155 mm length, designed for the ET 200 PRO frequency converter family. It's the physical backbone that carries power and communication between the converter and its expansion modules in a distributed drive setup.
Mounts directly onto the ET 200 PRO frequency converter's backplane rail. The 155 mm length matches the standard converter housing depth, so it doesn't overhang the DIN-rail footprint. No separate power supply needed — the module draws its bus voltage from the converter's internal backplane.