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High-Density 24V DC Input Interface for S5-100U Systems
The Siemens 6ES5431-4UA11 digital input module provides sixteen optically isolated channels for connecting field sensors to SIMATIC S5-100U controllers. This module accepts signals from pushbuttons, limit switches, proximity sensors, and other 24V DC devices. It features LED status indicators on each channel for immediate visual diagnostics.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model | 6ES5431-4UA11 |
| Series | SIMATIC S5-100U |
| Product Type | Digital Input Module |
| Number of Inputs | 16 (optically isolated) |
| Input Voltage | 24V DC (20.4V to 28.8V) |
| Input Current | Typically 7mA per channel |
| Input Delay (0→1) | 3ms |
| Input Delay (1→0) | 3ms |
| Galvanic Isolation | 1500V AC (between inputs and backplane bus) |
| Signal Grouping | 2 groups of 8 channels |
| Status Indicators | 1 x green LED per input channel |
| Power Supply | 5V DC via backplane bus |
| Current Consumption | 5V DC / 100mA (max) |
| Weight | 0.35 kg |
| Dimensions (W x H x D) | 25 x 120 x 116.4 mm |
| Operating Temperature | 0°C to 60°C |
| Protection Rating | IP20 |
Optimized Input Architecture
The Siemens 6ES5431-4UA11 organizes its sixteen inputs into two galvanically isolated groups of eight channels each. This grouping allows separate reference potentials for different sensor types within a single module. The optical isolation also protects the backplane bus from voltage spikes and electrical noise.
Fast Response and Diagnostics
The module’s 3ms input delay ensures rapid signal detection for time-critical automation tasks. Green LEDs provide immediate visual confirmation of active input states. These indicators significantly reduce troubleshooting time during commissioning and maintenance.
Reliable Sensor Interfacing
Each input channel draws a typical 7mA current, ensuring compatibility with most industrial sensors. The module accepts both sinking and sourcing sensor outputs without additional interface components. The wide voltage tolerance also accommodates variations in the 24V DC supply.
Compact Installation
This single-width module occupies just 25mm of rack space in S5-100U systems. Its 0.35 kg weight and standard dimensions simplify installation in dense control cabinets. The module integrates seamlessly with all S5-100U CPUs and other I/O modules.