Siemens 6ES5436-4UA11 8 Channel Digital Input Module

Siemens 6ES5436-4UA11 is a 16-channel digital input module designed for the SIMATIC S5 family, specifically as an input extension for S5-135U and S5-155U controllers. It provides sixteen discrete AC input points rated for 115/230 VAC and is described as a floating, compact version U module, with inputs arranged in two banks of eight channels. This module mounts into an S5 backplane and translates field signals from devices such as pushbuttons, limit switches, and other 115/230 VAC sensors into digital inputs for the PLC, enabling real‑time monitoring and conditioning of legacy automation lines without migrating to newer hardware. Key specifications include 16 digital inputs, AC operation at 115 or 230 VAC, floating input type, compact U‑version, and order number 6ES5436-4UA11.