Siemens 6ES7331-7KF01-0AB0 Analog Input Module — Legacy Replacement. Siemens 6ES7331-7KF01-0AB0 is the exact manufacturer order number for a analog input module in the SIMATIC S7-300 portfolio. Siemens describes this exact reference as: SIMATIC S7-300, ANALOG INPUT SM 331, OPTICALLY ISOLATED, U/I/THERMOCOUPLE/RESISTANCE INTERRUPT, DIAGNOSTICS; RESOLUTION 9/12/14 BITS, 8AI, REMOVE/INSERT W. BACKPLANE BUS 20 PIN. The verified manufacturer lifecycle record is PM500:Discontinued Product or end of PLM & Support.