Siemens 6ES7590-0AA00-0AA0 Automation Connection Component. Siemens 6ES7590-0AA00-0AA0 is the exact manufacturer order number for a automation connection component in the SIMATIC S7-1500 portfolio. Siemens describes this exact reference as: SIMATIC S7-1500, spare part U-connector for connection of I/O modules; self-assembling backplane bus 5 units per packing unit. The verified manufacturer lifecycle record is PM300: Active Product.