Siemens U-08N Eight-Channel Digital Input Module

Siemens U-08N Eight-Channel Digital Input Module is a compact digital I/O device designed to accept eight discrete 24 V DC signals from field devices into a Siemens controller. With a 20–28 V DC input range, the module is suited for standard 24 V DC automation environments. The U-08N supports both sinking and sourcing wiring configurations, allowing you to connect a variety of sensors and switches without changing the controller wiring scheme. Each of its eight channels provides an individual input line, enabling eight separate devices—such as limit switches, photoelectric sensors, pushbuttons, or other 24 V DC sensors—to be read by the PLC. This module is typically used to expand digital input points in distributed I/O configurations for Siemens controllers, enabling scalable panel layouts and easier wiring management. Typical applications include machine automation, process monitoring, packaging lines, and industrial control panels where robust, 24 V DC digital inputs are needed. The part number U-08N identifies an eight-channel digital input option within Siemens' digital input families, and the module is commonly sourced from Siemens Industry Mall and partner distributors.