Name: 6ES7431-7KF10-0AB0 Siemens SM431 RTD Module | 8 Channels PT100/NI100
SKU: 6ES7431-7KF10-0AB0
Price: 234.00 USD
Availability: InStock

Product details

Product Overview

Siemens 6ES7431-7KF10-0AB0 – analog input module for SIMATIC S7-400 systems
- SM 431 series, 8 isolated analog inputs
- 16-bit resolution with overrange
- Supports PT100, Ni100, and resistance sensors
- Diagnostics and alarm functions (parameterizable)

Technical Specifications – Hierarchical View

Supply & Power
- Backplane current: 5 V DC, max. 650 mA
- Typical power loss: 3.3 W
Analog Inputs
- 8 input channels for resistance thermometers and resistors
- Destruction limit: 35 V continuous, 75 V for 1 s (duty cycle 1:20)
- Constant measurement current: 1 mA typical
Supported Sensor Types
- Resistance thermometer: PT100, PT200, PT500, PT1000
- Nickel sensors: NI100, NI1000 (Europe/U.S. characteristics selectable)
- Resistance measurement: 3-wire and 4-wire connection supported
- No voltage, current, or thermocouple inputs
Conversion & Resolution
- Resolution: 16-bit with overrange (including sign)
- Integration time: parameterizable (none / 60 / 50 Hz)
- Basic conversion time: 8 / 23 / 25 ms
- Interference suppression: 50/60 Hz selectable
- Total module conversion time: 8 / 23 / 25 ms
Accuracy & Error Limits
- Basic error limit at 25°C: ±0.2°C (relative to input range)
- Operational error limit (full temp range): ±1°C
Diagnostics & Alarms
- Diagnostics function: parameterizable
- Diagnostic alarm: parameterizable
- Limit value alarm: included
- Hardware interrupt: parameterizable
- Diagnostic information readable via software
Isolation & Cable
- Isolation tested at 500 V DC
- Isolation: between channels and backplane bus
- No isolation between individual channels
- Shielded cable: max. 200 m (50 m for thermocouples / ±80 mV ranges)
Mechanical Data
- Width: 25 mm
- Height: 290 mm
- Depth: 210 mm
- Weight: 650 g approx.

Expert Review – Field Engineer’s Insight

This module delivers reliable temperature measurement for critical processes.
PT100 sensors are common in chemical plants and power generation systems.
The 16-bit resolution ensures precise readings for temperature control loops.
Use the 6ES7431-7KF10-0AB0 when you need accurate resistance measurements.
Multiple linearization characteristics support Europe and U.S. sensor standards.
Choose 3-wire or 4-wire connections for lead compensation accuracy.
The module handles 8 sensors per slot, saving valuable rack space.
Integration time filtering effectively removes 50/60 Hz electrical noise.

Compatibility & Applications

Compatible systems
- SIMATIC S7-400 PLCs (all CPU models)
- Works with S7-400 racks and power supplies
Suitable devices
- PT100, PT1000, NI100, NI1000 temperature sensors
- Resistance-based transducers (2, 3, or 4-wire)
- Thermocouple signals with external transmitters
Typical industries
- Chemical processing, power plants, pharmaceutical manufacturing
- Food and beverage, HVAC systems, environmental monitoring

Model Comparison

6ES7431-7KF10-0AB0 vs other S7-400 analog modules:
- vs 6ES7431-7KF00-0AB0 – older version with different resolution and diagnostic features
- vs 6ES7431-7QH00-0AB0 – faster conversion time but fewer supported sensor types
- vs 6ES7432-1HF00-0AB0 – analog output module, not for temperature measurement

Installation & Wiring Guide

Mounting
- Install the module in any S7-400 rack slot
- Secure with the built-in locking mechanism
- Allow airflow for heat dissipation (3.3W typical)
Wiring best practices
- Use shielded twisted pair cable for all sensor connections
- Keep cable length under 200 m for resistance sensors
- For 3-wire connections: connect all three wires to the correct terminals
- For 4-wire connections: use separate sense and source lines
- Connect cable shield to ground at the module end only
Configuration notes
- Select the correct linearization characteristic in your PLC program
- Choose between Europe (DIN) and U.S. (JIS) sensor standards
- Set integration time based on your mains frequency (50 or 60 Hz)
- Enable diagnostic alarms for wire break detection

Maintenance & Troubleshooting

Monitor diagnostic alarms through the PLC program
Check for wire break indications on each channel
Verify sensor resistance values using a multimeter
Calibrate the module according to your quality system schedule
Regularly check cable connections for corrosion or looseness

Package Contents

1x Siemens 6ES7431-7KF10-0AB0 analog input module
Product documentation (English/Chinese)

Shipping & Warranty

12-month warranty against manufacturing defects
Express shipping: FedEx, UPS, DHL
Dispatch within 12-24 hours (business days)

Frequently Asked Questions (FAQ)

Q: What temperature sensors work with the 6ES7431-7KF10-0AB0?
- A: PT100, PT200, PT500, PT1000, NI100, and NI1000. Selectable characteristics for Europe/U.S. standards.
Q: Does this module support thermocouples?
- A: No, the 6ES7431-7KF10-0AB0 does not accept thermocouple inputs. Use a different module for thermocouple signals.
Q: What is the difference between 3-wire and 4-wire connections?
- A: 3-wire uses one sense line to compensate lead resistance. 4-wire uses two sense lines for higher accuracy. Choose based on your accuracy requirements.
Q: What does the “integration time” setting do?
- A: It filters out mains frequency noise (50 Hz or 60 Hz). Select the frequency that matches your local power grid.
Q: Can I use this module for voltage or current signals?
- A: No, this module only accepts resistance and RTD inputs. For voltage/current, use the 6ES7431-7KF00-0AB0.
Q: What is the maximum cable length for PT100 sensors?
- A: Use shielded cable up to 200 meters. For longer distances, consider a transmitter with 4-20mA output.

Buying Guide & Selection Advice

Choose the 6ES7431-7KF10-0AB0 for PT100 and resistance temperature measurement.
Need voltage or current inputs? Consider the 6ES7431-7KF00-0AB0 instead.
For thermocouple signals, select the 6ES7431-7QH00-0AB0 with cold junction compensation.
Check your sensor connection type – 3-wire is common, 4-wire offers better accuracy.
Set the integration time correctly to avoid mains frequency noise interference.