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Description
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 6ES5431-8MC11 |
| Manufacturer | Siemens |
| Product Type | Digital Input Module |
| PLC Series | SIMATIC S5 (S5-90U/-95U/-100U, ET 100U, ET 200U) |
| Number of Inputs | 8 (floating, isolated) |
| Input Voltage | 115 V AC/DC |
| Signal “1” Voltage Range | 85 to 135 V |
| Signal “0” Voltage Range | 0 to 40 V |
| Input Current (AC) | ~12 mA at 115V |
| Input Current (DC) | ~2.5 mA at 115V |
| Frequency Range | 47 to 63 Hz |
| Inherent Delay (0→1) | ~10 ms |
| Inherent Delay (1→0) | ~20 ms |
| Max Cable Length (unshielded) | 100 meters |
| Power Consumption | ~2.5 W |
| Dimensions (LxWxH) | 13.5 x 10 x 4.5 cm / 11.1 x 13.9 x 5.6 cm |
| Weight | ~0.2 – 0.5 kg |
| Operating Temperature Range | -25°C to +60°C |
| Insulation Rating | Compliant with VDE 0160 |
Main Features and Advantages
High-Voltage Floating Inputs: The 6ES5431-8MC11 is distinguished by its ability to handle 115V AC/DC signals natively, eliminating the need for external signal conditioning for many common field devices. The floating (electrically isolated) design of the 6ES5431-8MC11 ensures that the module provides robust isolation against common-mode voltages, protecting the central processing unit from electrical surges and ground loops. This feature is critical for maintaining system stability and integrity in applications where signal grounding differences may exist.
Broad Compatibility and System Integration: The 6ES5431-8MC11 offers broad compatibility across the SIMATIC S5 family, supporting the S5-90U, S5-95U, S5-100U, ET 100U, and ET 200U systems. This flexibility allows for seamless integration into both new builds and retrofit projects without requiring major architectural changes. The module is fully programmable within the STEP 5 environment, allowing each input’s status to be mapped to specific memory addresses for real-time monitoring and complex logical programming using commands such as AND (A) and OR (O).
Optimized Signal Integrity and Response: The 6ES5431-8MC11 incorporates an inherent input delay function, with transition times of approximately 10 ms from “0” to “1” and 20 ms from “1” to “0”. This delay is specifically designed to suppress coupled electrical disturbances and contact bounce, ensuring that the PLC only registers stable, valid signals. Such functionality is essential for maintaining data accuracy and preventing false triggers in electrically noisy industrial environments. Additionally, support for unshielded cable lengths of up to 100 meters provides significant flexibility in system layout, allowing the 6ES5431-8MC11 to be positioned at a considerable distance from the field devices.
