Siemens 6GK1571-1AA00 Communication Processor. Siemens 6GK1571-1AA00 is the exact manufacturer order number for a communication processor in the SIMATIC NET PC Communication portfolio. Siemens describes this exact reference as: Communications processor CP 5711 USB adapter (USB V2.0) for connection of a PG or Notebook to PROFIBUS or MPI; contain 2 m USB cable. The verified manufacturer lifecycle record is PM300: Active Product.