SIPLUS S7-300 SM 331 8AI based on 6ES7331-1KF02-0AB0 with conformal coating, -25…+70 °C, isolated 8 AI, resolution 13 bit U/I/resistance/Pt100, NI100, NI1000, LG-NI1000, PTC/KTY, 66 ms conversion time; 1x 40-pole Just like the CPU, the analog input modules are also protected against extreme ambient conditions. Due to the 100% conformal coating they can withstand biologically, chemically and physically active substances, condensation, frost, and corrosive gases. Regardless of the conditions, your analog signals are reliably recorded.