SIPLUS S7-300 SM 322-20-pole based on 6ES7322-1HH01-0AA0 with conformal coating, -40…+70 °C, digital output optically isolated 16 DQ, relay contacts Just like the CPU, the digital output 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 digital signals are reliably output.