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High-Density 24V DC Input Solution for SIMATIC S5 Systems
The Siemens 6ES5431-6AA11 digital input module provides sixteen optically isolated input channels for connecting sensors and switches to S5-100U and S5-95U controllers. This module accepts 24V DC signals from proximity sensors, limit switches, pushbuttons, and other field devices. It features built-in short-circuit protection and LED status indicators for straightforward troubleshooting.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model | 6ES5431-6AA11 |
| Series | SIMATIC S5 |
| Product Type | Digital Input Module |
| Number of Inputs | 16 (isolated, grouped in two groups of 8) |
| Input Voltage | 24V DC |
| Input Current | Typical 7mA per channel |
| Input Delay | 3ms (0→1 and 1→0) |
| Input Type | Sink/source (positive/negative logic configurable) |
| Galvanic Isolation | 1500V AC (between inputs and backplane bus) |
| Protection Features | Short-circuit protection per channel |
| Status Indicators | 1 x green LED per input channel |
| Power Supply | 5V DC via backplane bus |
| Current Consumption | 5V DC / 200mA (max) |
| Weight | 0.4 kg |
| Dimensions (W x H x D) | 25 x 120 x 116.4 mm |
| Operating Temperature | 0°C to 60°C |
| Protection Rating | IP20 |
High-Density Input Architecture
The Siemens 6ES5431-6AA11 packs sixteen digital inputs into a single 25mm slot, maximizing I/O density in control cabinets. The inputs divide into two isolated groups of eight, allowing separate commons for different voltage zones. This grouping also simplifies wiring and reduces cable clutter in complex automation systems.
Flexible Input Configuration
Engineers can configure each input as either sinking or sourcing to match sensor output types. This flexibility eliminates the need for external interface relays or level converters. The typical 7mA input current ensures compatibility with a wide range of industrial sensors.
Status Indication and Diagnostics
A green LED illuminates beside each input channel to show active signal status. This visual feedback accelerates troubleshooting and reduces system downtime. Furthermore, the module’s short-circuit protection prevents damage from wiring faults or sensor failures.
Installation and Compatibility
This module slots directly into S5-100U and S5-95U rack systems via the backplane bus. It works seamlessly with all S5 CPUs and supports mixed configurations with other I/O modules. The compact single-width design also preserves rack space for additional functionality.