Siemens 505-4216A is a 16-point discrete input module for the TI505 rack-based PLC, delivering 16 independent AC-input signals to the controller. It accepts 16 AC inputs with a nominal 110 V rating and a practical input range around 79–132 VAC, making it suitable for wiring to field sensors and switches in industrial control panels. The part is cataloged as 505-4216A, with alternate references including 505-4216-A and 5054216A, as documented by Siemens and distributors for TI505 digital input applications.
