Siemens 6ES5420-7LA11 Analog Input Module For S7-400

Siemens 6ES5420-7LA11 is a 32‑channel digital input module for the SIMATIC S5‑115U backplane, designed to read 24 V DC input signals from field devices. This part belongs to the SIMATIC S5 420 family and is listed as a spare part for S5‑115U, featuring 32 inputs that are potential‑bonded (not isolated) across the module. It is intended to accept standard 24 V DC digital signals from switches, sensors, and other automation devices and convert them into binary data for the controller. Typical applications include panel controls, safety interlocks, and general digital input tasks in older S5 installations. Note that this module is part of the S5 family and is not a drop‑in replacement for SIMATIC S7‑400 I/O modules; verify your system backplane compatibility and module addressing when sourcing a replacement. The 6ES5420-7LA11 is commonly used as a spare part for repair or upgrade of legacy S5‑115U configurations and supports connection to the S5 backplane with the appropriate bus connectors.