Siemens 6ES5420-4UA13 is a SIMATIC S5-420 digital input module with 32 24V DC inputs in a non-floating, compact version U. It is designed to interface with compatible S5 controllers, converting each 24V DC signal from sensors and switches into binary input data for the CPU. This 32-channel DI module expands legacy S5‑420 automation networks, providing uniform electrical characteristics across all channels and enabling reliable digital sensing of devices like pushbuttons and limit switches.
