Siemens 6ES5-431-8MC11 Input Module

Siemens 6ES5-431-8MC11 is an eight-channel digital input module for SIMATIC S5 controllers, designed to accept eight 115 V AC input signals. It integrates into S5-90U, S5-95U, and S5-100U configurations, and is compatible with ET 100U and ET 200U distributed I/O setups, allowing you to expand the PLC’s input capability with a single card. The module carries the part number 6ES5-431-8MC11 (also seen as 6ES5 431-8MC11) and provides eight independent digital inputs that read external contact closures or switches at 115 VAC, enabling direct connection to common industrial sensors without external adapters. As a drop-in I/O card for the S5 bus, it supports retrofits and expansions for legacy automation projects that still rely on the S5 family.