Siemens 6ES5-431-8MA11 Input Module

Siemens 6ES5-431-8MA11 is an eight-channel digital input module for SIMATIC S5 distributed I/O in ET 100U and ET 200U configurations. It provides eight independent, isolated 24 V DC input circuits, translating field signals to the backplane with isolation up to 1500 VAC to protect the controller from faults and noise. Each input has field-side status indicators and is protected by transient suppression, supporting surge withstand capabilities in line with industry standards. The module draws about 32 mA of supply current and dissipates roughly 2 W of power, with a typical input-to-backplane delay of 4 to 5.5 ms when an input state changes. The device is UL-listed and CSA-certified and is used to interface sensors, switches, and other 24 V DC devices to SIMATIC S5 controllers, expanding ET 100U/ET 200U I/O while maintaining digital input integrity on the plant floor. The 6ES5-431-8MA11 designation identifies the model as the 8DI version of the 6ES5-431 family.