SIPLUS S7-300 SM 331 40-pole based on 6ES7331-7NF00-0AB0 with conformal coating, -25…+70 °C, analog input isolated 8 AI; +/-5/10V, 1-5 V, +/-20 mA, 0/4 to 20 mA, 16 bit (55 ms), single rooting (50 V COM.) 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.