Siemens 6ES7974-0AA00-0AA0 Analog Input Module — Legacy Replacement. Siemens 6ES7974-0AA00-0AA0 is the exact manufacturer order number for a analog input module in the SIMATIC S7-300 Connection System portfolio. Siemens describes this exact reference as: *** spare part *** SIMATIC S7, measuring range module for analog inputs, 2 units per packing unit. The verified manufacturer lifecycle record is PM410:Product cancellation.