Siemens 6ES7650-1BD51-0XX0 Interface Module — Legacy Replacement. Siemens 6ES7650-1BD51-0XX0 is the exact manufacturer order number for a interface module in the SIMATIC S7-300 Connection System portfolio. Siemens describes this exact reference as: ********** Replacement part ********* SIMATIC PCS7, FET switch adapter for ET200M F-AI interface module 6ES7650-1AH51-5XX0. The verified manufacturer lifecycle record is PM500:Discontinued Product or end of PLM & Support.