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Technical Overview
The Siemens 6ES5431-8FA11 is a digital input module for the SIMATIC S5-135U programmable controller series . This unit interfaces with field devices such as limit switches, pushbuttons, and proximity sensors . It features 16 optically isolated input channels that convert 24 VDC signals into logic levels for the CPU . The module includes a removable terminal strip that simplifies field wiring and replacement . An LED indicator for each channel provides immediate visual confirmation of the input status.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model Number | 6ES5431-8FA11 |
| Product Type | Digital Input Module |
| System Compatibility | SIMATIC S5-135U |
| Number of Channels | 16 |
| Input Voltage | 24 VDC |
| Input Current | 7 mA (typical) |
| Isolation | Optical (channels to backplane) |
| ON-State Voltage | > 13 VDC |
| OFF-State Voltage | < 5 VDC |
| Input Delay | 2 ms (typical) |
| Power Consumption | 1.5 W (from backplane) |
| Terminal Type | Removable screw-type |
| Dimensions | 233 x 37 x 268 mm |
| Weight | 0.38 kg |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Humidity | 5% to 95% RH (non-condensing) |
| Certifications | CE, UL, CSA |
| Country of Origin | Germany |
Key Features
Optical Isolation – The 1500V isolation protects the CPU from field-side electrical noise and voltage spikes.
Visual Status Indication – Sixteen green LEDs provide immediate channel-level diagnostics for each input.
Wide Operating Range – The module accepts 24 VDC signals with a wide ON-voltage threshold.
Fast Response Time – The 2 ms input delay ensures reliable capture of high-speed digital events.
Removable Terminal Strip – The detachable connector simplifies wiring and accelerates module replacement.
Applications
The Siemens 6ES5431-8FA11 excels in discrete manufacturing, process monitoring, and machine control. It is ideal for conveyor systems, packaging lines, and any automation requiring reliable digital input acquisition.