6ES7431-7KF10-0AB0 Siemens RTD Temperature Input Module
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Specialized Temperature & Resistance Input Module with Diagnostics
Directly connect temperature sensors to your S7-400 PLC with this high-precision 8-channel analog input module. The Siemens 6ES7431-7KF10-0AB0 is engineered for RTDs (like PT100) and resistance measurement. It features 16-bit resolution, built-in linearization, and advanced diagnostic alarms for reliable process monitoring.
Core Advantages for Your Application
Direct Sensor Connection: Plug in PT100, PT1000, NI100, NI1000 sensors directly—no external transmitter needed.
High Accuracy: Achieves ±0.2°C precision at room temperature for superior temperature control.
Smart Diagnostics: Detects wire breaks, sensor faults, and limit breaches, sending immediate alarms to the PLC.
Built-in Linearization: Automatically converts sensor resistance to accurate temperature readings using standard curves.
Complete Technical Data
Brand: Siemens
System: SIMATIC S7-400
Module Designation: Analog Input SM 431
Full Model Number: 6ES7431-7KF10-0AB0
Input Channels: 8, electrically isolated from the PLC bus.
Signal Specialization: Resistance Thermometers (RTDs) and Resistance.
Supported Sensor Types: Pt100, Pt200, Pt500, Pt1000, Ni100, Ni1000.
Measurement Resolution: 16 bits (high-detail measurement).
Typical Conversion Time: 20 ms per module (with 50 Hz suppression).
Temperature Accuracy: Basic: ±0.2°C. Operational: ±1.0°C.
Wiring Options: 3-wire or 4-wire connection for best accuracy.
Noise Suppression: Selectable 50 Hz, 60 Hz, or off.
Diagnostic Functions: Wire break, short circuit, limit value alarm.
Max Cable Length: 200 meters (shielded).
PLC Bus Power: 5V DC, max. 650 mA.
Module Dimensions: 25 mm x 290 mm x 210 mm.
Product Weight: Approximately 650 grams.
Installation & Configuration Guide
Mount the module in your S7-400 rack. For optimal accuracy with RTDs, always use 3-wire or 4-wire connection to eliminate lead resistance errors. Use shielded cables and ground the shield at the module. In the PLC configuration software (like STEP 7), you must select the correct sensor type (e.g., PT100 standard) and enable desired diagnostics (like wire break monitoring) for each channel.
Warranty & Shipping Details
Your purchase is protected by a comprehensive 12-month warranty. We ship globally using reliable carriers: FedEx, UPS, and DHL.
Expert FAQs
Q: Can this module measure voltage or current signals like 4-20mA?
A: No, this is a specialized module. It only measures resistance and resistance-based temperature sensors (RTDs). For 4-20mA, you need a standard analog input module.
Q: What is the benefit of a 4-wire over a 3-wire connection?
A: A 4-wire connection provides the highest accuracy because it completely compensates for the resistance of the leads connecting the sensor. Use it for critical measurements.
Q: How does the wire break diagnostics work?
A: The module sends a small constant current through the sensor. If the circuit is open (wire break), the measured resistance becomes infinitely high, triggering a configurable diagnostic alarm.
Q: What does "linearization" mean in this context?
A: RTD resistance changes with temperature in a non-linear way. The module's firmware contains mathematical curves that automatically convert the measured resistance into an accurate, linear temperature value for your PLC program.
Q: Is external power required for the sensors?
A: No. The module itself provides the precise constant current source needed to excite the RTD sensors. No external power supply is required for the measurement circuit.
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