Siemens 6Es5 431-8Mc11 8-Point Digital Input Module

Siemens 6ES5 431-8MC11 is an eight-point digital input module for SIMATIC S5 automation systems, designed to plug into S5-90U, S5-95U, and S5-100U CPUs and to integrate with ET 100U and ET 200U decentralized I/O topologies. It provides eight digital inputs configured as floating inputs and is rated for 115 V AC signal levels. The module supports a typical response time near 10 ms, draws about 32 mA of supply current, and dissipates roughly 2.5 W. Identified in Siemens documentation as 8DI on the 431-8MC11 reference, it is commonly used to read on/off states from field devices such as pushbuttons, limit switches, and proximity sensors in industrial automation, machine control, and packaging or conveyor lines. The 6ES5 431-8MC11 can be deployed within ET 200U DP configurations to extend input capacity for legacy S5 networks, preserving compatibility with existing Siemens I/O schemes while adding reliable, discrete signaling capabilities for control logic and sequencing tasks.