SIPLUS S7-300 SM 323-20-pole based on 6ES7323-1BH01-0AA0 with conformal coating, -40…+70 °C, digital module isolated 8 DI and 8 DQ, 24 V DC, 0.5 A total current 2 A Just like the CPU, the digital input and 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 recorded.