Siemens 6ES7431-1KF00-0AB0 - High-Precision 8-Channel Analog Input Module

Introducing the Siemens 6ES7431-1KF00-0AB0 analog input module. This versatile card is designed for the SIMATIC S7-400 PLC system. It provides 8 isolated analog inputs to measure voltage, current, and resistance signals with high accuracy. Featuring a 13-bit resolution, it ensures precise data acquisition for process control and monitoring applications.

Complete Technical Specifications

Brand & Series: Siemens SIMATIC S7-400

Full Model Number: 6ES7431-1KF00-0AB0 (Analog Input SM 431)

Module Type: 8-Channel Analog Input, Isolated

Input Channels: 8 (Voltage/Current), 4 (Resistance)

Resolution: 13 bits (including sign)

Voltage Input Ranges: ±1V, ±10V, 1-5V

Current Input Ranges: ±20mA, 4-20mA

Resistance Input Range: 0 to 600 Ω (0-500 Ω usable)

Input Resistance: 200 kΩ (Voltage), 80 Ω (Current)

Conversion Time: 23/25 ms per channel

Basic Accuracy (at 25°C): ±0.4% to ±0.8% of range

Power Supply: From backplane bus (5V DC, max 350 mA)

Power Loss: Typically 1.8 W

Max Cable Length: 200 m (shielded)

Isolation Test Voltage: 2120 V DC

Dimensions (W x H x D): 25 mm x 290 mm x 210 mm

Weight: Approximately 500 g

Installation & Sensor Connection Guide

This S7-400 module installs directly into the PLC rack. It connects to a wide variety of sensors. Use shielded cables for best performance. For 4-20mA 2-wire transmitters, an external 24V power supply is required. The module supports resistance measurement with 2, 3, or 4-wire connections to cancel lead resistance errors.

Package & Warranty Details

What You Receive: One new Siemens 6ES7431-1KF00-0AB0 analog input module.

Our Warranty: This product is covered by a 12-month warranty from the date of purchase.

Fast Global Shipping

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Frequently Asked Questions (FAQ)

What types of sensors can I connect?

You can connect pressure transmitters, temperature sensors with transmitters, level sensors, flow meters, potentiometers, and any device with a standard voltage, current, or resistance output.

How accurate is this module?

At room temperature (25°C), basic accuracy is within ±0.4% for the ±10V range and ±0.7% for current ranges. Accuracy may vary slightly with temperature changes.

Can I measure a 0-10V signal?

Yes. Use the ±10V input range. The signal will be measured correctly, with 0V giving the mid-scale digital value. Remember to set the correct range in your PLC hardware configuration.

Does it support thermocouples or RTDs directly?

No. The 6ES7431-1KF00-0AB0 does not have built-in cold junction compensation or direct linearization for temperature sensors. You need to connect a temperature transmitter that outputs a standard 4-20mA or voltage signal.

What is the difference between 2-wire and 4-wire resistance measurement?

In 2-wire mode, the resistance of the connecting wires adds to the measurement. 4-wire (Kelvin) measurement uses separate wires for current and voltage, eliminating wire resistance error for much higher accuracy.

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