Siemens 6ES5405-7AA21 Digital Input Module

High-Density 32-Channel Digital Input for SIMATIC S5-100U Systems

The 6ES5405-7AA21 digital input module provides 32 discrete input channels for the SIMATIC S5-100U programmable controller. This module accepts 24 V DC signals from field devices such as pushbuttons, limit switches, and proximity sensors. It features optoelectrical isolation for reliable operation in industrial environments. Consequently, this module suits applications requiring high-density input capability for the compact S5-100U platform.

Technical Specifications

Input Characteristics and Performance

Each input channel on the 6ES5405-7AA21 draws 7 mA nominal current at 24 V DC. The module provides a response time of less than 5 ms for fast signal capture. It meets Type 2 characteristics per EN 61131-2 standards. Furthermore, the module features optoelectrical isolation between the inputs and the backplane bus. This design protects the controller from electrical noise and voltage spikes.

Physical Characteristics and Installation

Weighing approximately 0.35 kg, this module features a compact design suitable for S5-100U systems. It occupies a single slot in the S5-100U rack. The module uses screw terminal connections for secure field wiring. The front panel provides LED indicators for each input channel, displaying real-time signal status. Additionally, users can install the 6ES5405-7AA21 quickly without special tools.

System Compatibility and Application

This module integrates specifically with the SIMATIC S5-100U compact controller family. It communicates with the CPU through the S5 backplane bus. Users can connect this module to field devices such as sensors, switches, and encoders. The high-density 32-channel design maximizes I/O capacity within the compact S5-100U form factor. Consequently, this module suits space-constrained control cabinets.