Name: 6ES7431-1KF10-0AB0 S7-400 Analog Module | TC/RTD/Voltage/Current Inputs
SKU: 6ES7431-1KF10-0AB0
Price: 234.00 USD
Availability: InStock

Product details

Product Overview

Siemens 6ES7431-1KF10-0AB0 is an analog input module for the SIMATIC S7-400 system.
- Provides 8 isolated analog inputs with 14-bit resolution.
- Supports voltage, current, resistance, thermocouple, and RTD signals.
- Offers flexible configuration for various industrial sensors.

Key Features at a Glance

8 analog input channels
- Supports voltage, current, resistance, TC, and Pt100.
- Each channel is isolated from the backplane bus.
14-bit resolution with 16-bit filtering
- Delivers precise measurement data for critical processes.
- Filtering reduces noise for stable readings.
Wide input range selection
- Voltage: ±80mV to ±10V, 1-5V.
- Current: 0-20mA and 4-20mA.
- Resistance: 0-48Ω to 0-6000Ω.
- Thermocouples: Types B, E, J, K, L, N, R, S, T, U.
- RTDs: Pt100, Pt200, Pt500, Pt1000, Ni100, Ni1000.
Built-in linearization
- Automatically linearizes thermocouple and RTD signals.
- Eliminates manual scaling in PLC logic.

Technical Specifications

Brand & Model
- Brand: Siemens
- Model: 6ES7431-1KF10-0AB0
- Series: SIMATIC S7-400
Power Supply
- Load voltage: 24V DC (for 2-wire transmitters)
- Reverse polarity protection: Yes
- Current from L+: 200mA (with 8 transmitters)
- Current from backplane: 600mA
Analog Inputs
- Number: 8 channels
- Voltage inputs: 8 channels
- Current inputs: 8 channels
- Resistance inputs: 4 channels (2/3/4-wire)
Input Ranges (Voltage)
- ±80mV, ±250mV, ±500mV
- ±1V, ±2.5V, ±5V, ±10V
- 1-5V
- Input impedance: 1MΩ
Input Ranges (Current)
- 0-20mA, 4-20mA
- Input impedance: 50Ω
Input Ranges (Thermocouples)
- Types B, E, J, K, L, N, R, S, T, U
- Input impedance: 1MΩ
- Linearization: Parameterizable
Input Ranges (RTDs)
- Pt100, Pt200, Pt500, Pt1000
- Ni100, Ni1000
- Linearization: Parameterizable
Input Ranges (Resistance)
- 0-48Ω, 0-150Ω, 0-300Ω
- 0-600Ω, 0-6000Ω
- Max 5000Ω usable
Resolution & Conversion
- Resolution: 14-bit (16-bit with filtering)
- Integration time: 16.7ms / 20ms
- Basic conversion: 20.1ms / 23.5ms
- Module execution: 161ms / 188ms
Accuracy & Error Limits
- Temperature error: ±0.004%/K
- Basic error (voltage): ±0.15%
- Basic error (current): ±0.15%
- Basic error (resistance): ±0.15%
- Basic error (RTD): ±0.3%
Cable Length (Shielded)
- Standard: 200m
- Thermocouples / ≤80mV: 50m
Isolation
- Between channels: No
- Between channels and backplane: Yes
- Between channels and L+: Yes
- Test voltage: 2120V DC
Dimensions & Weight
- Width: 25mm | Height: 290mm | Depth: 210mm
- Weight: approx. 500g

Expert Review – Field Engineer’s Perspective

The 6ES7431-1KF10-0AB0 is the go-to module for process applications.
- Supports almost every analog sensor type in one module.
- 14-bit resolution delivers accurate readings for critical loops.
- External temperature compensation improves thermocouple accuracy.
Recommended for chemical plants, power generation, and pharmaceutical processes.
- Handles temperature, pressure, flow, and level signals reliably.
- Works with both 2-wire and 4-wire transmitters.

Manager’s Insight – Selection Advice

Choose 6ES7431-1KF10-0AB0 for multi-sensor applications.
- One module covers voltage, current, TC, RTD, and resistance.
- Reduces spare parts inventory and training costs.
For high-density applications, consider 6ES7431-7QH00-0AB0 (16-bit, 8 channels).
For budget-conscious projects, 6ES7431-1KF00-0AB0 offers similar features.

Compatible Systems & Applications

Compatible PLCs
- Siemens SIMATIC S7-400 series CPUs
- Works with all S7-400 racks
Typical Applications
- Temperature monitoring with thermocouples and RTDs
- Pressure and flow measurement with 4-20mA transmitters
- Level measurement with resistance sensors
- Process control loops in chemical and pharmaceutical plants

Installation & Wiring Guidelines

Mounting
- Insert module into any S7-400 slot.
- Secure with the locking mechanism.
- Connect front connector for wiring.
Wiring Tips
- Use shielded cable for thermocouple and low-voltage signals.
- For RTDs, use 3-wire or 4-wire connections for best accuracy.
- Keep analog wires away from high-voltage cables.
Configuration
- Set input type and range in STEP 7 hardware config.
- Enable filtering for noisy environments.
- Configure external compensation for thermocouples.

Package Contents

1x Siemens 6ES7431-1KF10-0AB0 module
1x front connector (screw type)
1x labeling strip
1x quick reference guide

Shipping & Warranty

Warranty: 12 months against manufacturing defects
Dispatch: Within 12-24 hours on business days
Shipping: FedEx, UPS, or DHL

Comparison with Similar Models

6ES7431-1KF10-0AB0 vs 6ES7431-1KF00-0AB0
- KF10 offers improved accuracy and more input ranges.
- KF10 includes Pt1000, Ni1000, and additional thermocouple types.
- KF10 has external compensation support.
6ES7431-1KF10-0AB0 vs 6ES7431-7QH00-0AB0
- 7QH00 offers 16-bit resolution for higher precision.
- 7QH00 includes HART communication capability.
- KF10 is more cost-effective for standard applications.

Frequently Asked Questions

Q: Can I mix different input types on one module?
- A: Yes, each channel configures independently for voltage, current, TC, RTD, or resistance.
Q: What is the maximum cable length for thermocouples?
- A: Use shielded cable up to 50m for thermocouples. For voltage signals over ±80mV, limit to 50m.
Q: Does this module provide diagnostics?
- A: No, this module does not include diagnostic functions. For diagnostic capability, choose 6ES7431-7QH00-0AB0.
Q: Can I use 2-wire transmitters with this module?
- A: Yes, the module supplies 24V DC for 2-wire transmitters. Connect them directly to the input terminals.
Q: How do I improve accuracy for thermocouples?
- A: Use external temperature compensation with a Pt100 sensor. This removes cold-junction errors effectively.

Buyer’s Selection Guide

Choose 6ES7431-1KF10-0AB0 for versatile analog input applications.
Need higher precision? Select 6ES7431-7QH00-0AB0 with 16-bit resolution.
For pure current/voltage signals without thermocouple support, use 6ES7431-1KF00-0AB0.
Consider spare parts standardization when selecting multiple modules.