Siemens 6ES5420-4UA13 Digital Input Module 4DI

Siemens 6ES5420-4UA13 Digital Input Module is a 32‑channel digital input card for the SIMATIC S5‑420 family, delivered in the non‑floating compact “U” variant. It provides 32 isolated 24 V DC inputs that connect to sensors, switches, and other digital devices, and it slides into the S5‑420 backplane for straightforward integration in legacy control panels. The module is built for rugged industrial environments, with a 24 V DC supply input and standard digital input behavior to reliably register on/off states. Typical applications include reading proximity and limit switches on manufacturing lines, door interlocks, and safety‑related control circuits where 24 V DC logic signals are used. This 6ES5420-4UA13 part serves as a drop‑in replacement within SIMATIC S5‑420 automation setups, offering compact footprint and wiring simplicity for expanded I/O in older Siemens systems.