Siemens 6ES7390-0AA00-0AA0 Automation Connection Component — Legacy Replacement. Siemens 6ES7390-0AA00-0AA0 is the exact manufacturer order number for a automation connection component in the SIMATIC S7-300 portfolio. Siemens describes this exact reference as: ***spare part*** SIMATIC S7, bus connector (spare part). The verified manufacturer lifecycle record is PM410:Product cancellation.