Siemens 6ES7461-4AA01-0AA0 Interface Module — Legacy Replacement. Siemens 6ES7461-4AA01-0AA0 is the exact manufacturer order number for a interface module in the SIMATIC S7-400 portfolio. Siemens describes this exact reference as: ********** Replacement part ********* SIMATIC S7-400, Interface module receiver IM 461-4 for distributed coupling up to 600 m, without C bus. The verified manufacturer lifecycle record is PM500:Discontinued Product or end of PLM & Support.