Siemens 6ES7431-1KF10-0AB0: Universal 8-Channel Analog Input Module

Connect almost any sensor to your S7-400 PLC. The Siemens 6ES7431-1KF10-0AB0 offers eight isolated analog inputs. It reads voltage, current, resistance, RTDs, and thermocouples with high 14-bit resolution. This module provides reliable data for process control and monitoring.

Detailed Technical Specifications

• Product Model: Siemens 6ES7431-1KF10-0AB0 (SM 431 Series).
• Input Channels: 8 analog inputs, electrically isolated.
• Signal Types: Voltage, Current (0/4-20mA), RTD (Pt100, Ni100), Thermocouple (Types B, E, J, K, etc.), Resistance.
• Resolution: Up to 14-bit (16-bit with filtering).
• Basic Accuracy: ±0.15% for voltage/current at 25°C.
• Input Impedance: 1 MΩ for voltage, 50 Ω for current.
• Conversion Time: 20.1 ms to 23.5 ms per channel.
• Power Consumption: Typical 3.5W from backplane and load.

Measurement Ranges & Wiring

• Voltage Ranges: ±80mV, ±250mV, ±500mV, ±1V, ±2.5V, ±5V, ±10V, 1-5V.
• Current Ranges: 0-20 mA and 4-20 mA.
• Sensor Wiring: Supports 2, 3, and 4-wire connections for RTDs and resistors.
• Cable Length: Up to 200m shielded; 50m for thermocouples on low ranges.
• Module Dimensions: 25mm (W) x 290mm (H) x 210mm (D).

Ordering & Support Information

• Includes one Siemens SM431 analog input module ready for installation.
• This product is covered by a 12-month warranty from the date of purchase.
• We offer fast global shipping via FedEx, UPS, and DHL.

Professional FAQs

• Can I mix different sensor types on one module?
  Yes, each of the 8 channels can be individually configured for a different sensor type via the PLC software.
• What is needed for thermocouple cold junction compensation?
  You must use an external Pt100 sensor or a compensation box. The module itself does not have internal temperature compensation for thermocouples.
• How does it handle noisy electrical environments?
  It features excellent 50/60 Hz noise rejection and 2120V DC isolation between the field side and the PLC bus, making it very robust.
• What's the maximum input voltage it can withstand?
  The inputs are protected against overvoltage. They can continuously handle up to 18V and short spikes up to 75V for 1ms.
• Is it suitable for critical temperature control loops?
  Absolutely. Its high accuracy (e.g., ±0.3% for Pt100) and good resolution make it a reliable choice for precise temperature monitoring and control systems.

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