The Siemens 6ES7221-1BH32-0XB0 is a digital input module from the SIMATIC S7-1200 series. This compact and powerful module, designated as SM 1221, is designed to expand the capabilities of your S7-1200 controller by providing 16 additional digital inputs. It operates at a rated voltage of 24 V DC and supports both sinking and sourcing input configurations, offering high flexibility for connecting a wide range of sensors and switches. Ideal for various industrial automation applications, this module ensures reliable and fast signal acquisition for precise process control.