***spare part*** SIPLUS S7-1200 SM 1234 4AI/2AQ based on 6ES7234-4HE30-0XB0 with conformal coating, 0…+55 °C, analog I/O +/-10 V: 14-bit resolution or 0-20 mA: 13-bit resolution Just like the CPU, the analog 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.