Siemens AG 6ES5 431-8MA11 Digital Input Module

Siemens 6ES5 431-8MA11 is an eight-channel digital input module for the SIMATIC S5 family (ET 100U distributed I/O), delivering eight independent and isolated 24 V DC input circuits that monitor field devices such as switches and sensors. Each input is isolated from the others with up to 1500 VAC between field and logic, and the module provides field-side indicators to show active states. To protect the control system, it features transient protection and surge-withstand capability in compliance with IEEE 472-1974 and ANSI C37.90A. UL listed and CSA certified, this module is designed for harsh industrial environments and is commonly used to expand digital input capacity in older Siemens S5 installations within ET 100U distributed I/O configurations.