Siemens 6ES5 431-2BA11 Input Module

Siemens 6ES5 431-2BA11 is a 16-channel digital input module for the SIMATIC ET 200B distributed I/O system used with SIMATIC S5 controllers. It provides 16 independent 24 V DC input points that monitor sensors and switches and feed their logic state into the ET 200B backplane. The module is specified for 24 V DC input signals and is listed with hardware revision E-Stand 1 in common catalog entries. The 6ES5 431-2BA11 part number uniquely identifies this ET 200B digital input card within the S5-era family. It is designed for use in ET 200B installations to expand the digital input capacity of an S5 PLC system, enabling straightforward monitoring of 24 V devices such as pushbuttons, limit switches, proximity sensors, and other industrial sensors. When wired to a compatible ET 200B base rack, it communicates input status to the PLC, supporting standard DI mapping for automated control logic. This module is commonly used in legacy automation projects that rely on 24 V input devices and ET 200B I/O, and it complements other 16DI modules in the ET 200B family to scale input channels without changing the controller hardware.