Siemens 6GK1571-1AA00-0AH0 Communication Processor. Siemens 6GK1571-1AA00-0AH0 is the exact manufacturer order number for a communication processor in the SIMATIC NET PC Communication portfolio. Siemens describes this exact reference as: DIN rail support for communications processor CP 5711, rack unit for CP 5711 enclosure; Mechanical Mounting on 35 mm DIN rail . The verified manufacturer lifecycle record is PM300: Active Product.