Siemens 6ES5400-7AA13 Programmable Logic Controller Module

Siemens 6ES5400-7AA13 is an 8-channel digital input module for the SIMATIC S5 family, designed to slot into a 400-series input backplane and provide galvanically isolated 24 V DC signals to the controller. The module is described as “DIGITAL INPUT MODULE 400 GALVANICALLY ISOLATED 8 INPUTS 24 V DC,” confirming eight independent inputs at 24 V DC for reading external devices. It is used in legacy Siemens S5 installations, such as S5-100 rack configurations, to capture on/off states from field devices and feed them into the S5 backplane. The 6ES5400-7AA13 designation identifies its place in the SIMATIC S5 400-series digital input family, representing the specific 8-input, 24 V DC configuration within that lineage.