Siemens 6ES5420-3BA11 Communication Interface Module

Siemens 6ES5420-3BA11 is a SIMATIC S5 420 digital input module that provides 32 non-isolated 24 V DC inputs for the SIMATIC S5 backplane. Built for use with SIMATIC S5 400/420 systems, this module reads 24 V DC sensing signals from field devices and feeds them into the PLC input bus via the S5 backplane, enabling straightforward expansion of digital I/O in older automation lines. The 32 inputs are non-isolated, meaning galvanic isolation is not provided between individual channels; proper wiring, grounding, and shielding are recommended in electrically noisy environments. Designed for industrial automation tasks, it supports standard 24 V DC logic and is compatible with the S5 ecosystem, making it suitable for applications such as machine control, process monitoring, and basic control logic where a compact, hard-wired digital input surface is needed.