SIPLUS S7-1200 SB 1231 1AI RTD is based on 6ES7231-5PA30-0XB0 with Conformal Coating, operating temperature range of -40 to +60 °C, and a start temperature of -25 °C. SIPLUS S7-1200, analog input, SB 1231RTD, 1 AI RTD, PT 100 and PT1000 SIMATIC S7-1200 Basic Controller - flexible with a variety of communication options. If you only need to expand your SIMATIC S7-1200 CPU by a few inputs or outputs, signal boards are a good alternative to signal modules. Signal boards are directly plugged into the front of the controller (also possible with CPU 1211C) and are available as digital and analog input, output, and mixed modules. A communication board with RS 485 interface is also available. Signal boards allow for retrofitting of the configuration without requiring additional space in the control cabinet. Like the CPU, the analog input modules are also protected against extreme environmental conditions. With 100% Conformal Coating, they resist biological, chemical, and mechanically active substances, condensation, frost, and harmful gases. Regardless of the conditions, your analog signals will be reliably captured.