SIEMENS SIMATIC S7-1200 analog input module 6ES7231-4HD32-0XB0 is a high-precision analog signal acquisition module specially designed for industrial automation control. It supports multiple input ranges including ± 10V, ± 5V, ± 2.5V, and 0-20mA/4-20mA for sensor signal acquisition and processing in a variety of industrial environments.