The Siemens 6ES7331-1KF01-0AB0 is a Simatic S7-300. 6ES73311KF010AB0 is a analog input SM 331, optically isolated, 8 AI, 13 BIT resolution, U/IRESIST ANCE/PT 100, NI100, NI1000, LG-NI1000, 66 MS module update, 1 x 40 PIN. Successor number: 6ES7331-1KF02-0AB0

The Siemens 6ES7331-7KF02-0AB0 is a Simatic S7-300. 6ES73317KF020AB0 is a analog input SM 331, optically isolated, 8AI, resolution 9/12/14 BITS, U/I/thermocouple/resistance interrupt, diagnostics; 1 x 20 PIN remove/insert W. backplane bus.