Siemens 6ES7431-1KF20-0AB0 SIMATIC S7-400 SM 431 Analog Input Module

Commercial Terms

Minimum Order Quantity	1 Piece
Price	Contact for Jim
Packaging Details	Original new Factory Sealed
Delivery Time	3–7 Days
Payment Terms	T/T
Shipping Method	DHL / FedEx / UPS / TNT
Supply Ability	In stock

Specifications

Model Number	6ES7431-1KF20-0AB0
Voltage / current input channels	8 analog inputs
Resistance input channels	4 resistance inputs
Resolution	14 bits including sign and overrange
Load supply voltage	24 V DC; required only for two-wire transmitters
Maximum transmitter supply current	200 mA from L+ for eight fully driven two-wire transmitters
Maximum backplane current	1000 mA at 5 V DC
Typical power loss	4.9 W
Continuous voltage destruction limit	18 V
Transient voltage destruction limit	75 V for 1 ms; mark-to-space ratio 1:20
Continuous current destruction limit	40 mA
Resistance-transmitter measurement current	1.67 mA typical
Voltage range, offset	1–5 V
Voltage range, low bipolar	-1 to +1 V
Voltage range, high bipolar	-10 to +10 V
Input resistance, low / offset voltage ranges	10 MΩ at ±1 V and 1–5 V
Input resistance, ±10 V	100 kΩ
Bipolar current range	-20 to +20 mA
Unipolar current range	4–20 mA
Input resistance, ±20 mA	50 Ω
Resistance measurement range	0–600 Ω
Maximum shielded cable length	200 m
Basic conversion time	52 µs per channel
Interference-frequency suppression	None / 400 / 60 / 50 Hz
Input-filter time constant	15 µs
Module basic execution time	0.42 ms with all channels enabled
Temperature error	±0.03% of input range per kelvin
Voltage operational error	±0.7% at ±1 V; ±0.9% at ±10 V and 1–5 V
Current operational error	±0.8% of ±20 mA / 4–20 mA range
Resistance operational error	±1% of resistance input range
Voltage basic error at 25 °C	±0.6% at ±1 V; ±0.75% at ±10 V and 1–5 V
Current basic error at 25 °C	±0.7% of current input range
Resistance basic error at 25 °C	±0.7% of 0–600 Ω range
Bus-to-analog isolation test	2120 V DC
Bus-to-local-ground isolation test	500 V DC

Contact info

Sales

Jim Pei

Email

[email protected]

Phone/Whatsapp

+86 18020776782

Description

01

Siemens 6ES7431-1KF20-0AB0 is the SM 431 analog input module for SIMATIC S7-400. It measures supported voltage, current and resistance signals. Voltage and current measurements use the available analog input channels. Resistance measurement uses the documented resistance-input arrangement. The module is not a thermocouple or resistance-thermometer input configuration.

02

The module connects analog field signals to a compatible controller station. Wiring must match the selected measurement type. Resistance wiring options differ in how line resistance affects the result. The load supply is needed when supplying two-wire transmitters. Confirm signal ranges and channel settings before replacing an existing module.

Diagnostics

01

Measurement setup

Confirm the selected signal type before checking measured values; this module excludes thermocouple and RTD input ranges.

02

Resistance wiring

Two-wire and three-wire resistance connections also measure line resistance; a four-wire connection is supported.

03

Diagnostic limitations

The data sheet does not provide a diagnostics function for this configuration, so plan checks through the measurement setup and controller.

FAQ

01

Can 6ES7431-1KF20-0AB0 directly measure thermocouples?

No. Thermocouple and resistance-thermometer ranges are not supported by this configuration.

02

Does 6ES7431-1KF20-0AB0 support four-wire resistance measurement?

Yes. Two-wire, three-wire and four-wire resistance connections are listed, with different line-resistance effects.

03

Why is the load supply needed on 6ES7431-1KF20-0AB0?

It is required for supplying two-wire transmitters, rather than for every measurement configuration.

04

Will 6ES7431-1KF20-0AB0 report channel diagnostic alarms?

The data sheet lists no diagnostics function. Do not assume alarms available on another SM 431 variant are included.

05

Can you provide condition evidence for 6ES7431-1KF20-0AB0?

Yes. Jim provides actual-item photos and condition confirmation. Items are tested before delivery with the agreed 12-month warranty.

06

How fast is a paid 6ES7431-1KF20-0AB0 shipment arranged?

Available stock is dispatched promptly upon payment receipt, with tracking provided.

About Company

01

Years of Global Experience

With 20+ years of industry experience, we serve customers worldwide and have built long-term relationships across the UK, Russia, UAE, India, Venezuela, and more.

02

Professional Support Team

Our experienced team provides reliable pre-sales and after-sales support, helping customers select suitable products and resolve purchasing concerns.

03

Wide Range of Brands

We supply leading automation brands covering PLCs, DCS, I/O modules, drives, motors, power supplies, communication modules, and more.

04

Large In-Stock Inventory

A wide range of products is available from stock, including discontinued, obsolete, and hard-to-find parts, helping reduce sourcing time.

05

Honesty & Trust

We value long-term cooperation and treat every customer with honesty, respect, responsibility, and care.

06

Your Trusted Automation Partner

From a single replacement part to complete automation projects, we are ready to support your needs and build a long-term partnership.

Transaction Cases

Sincere Cooperation, Long-Term Trust

Germany

A Germany customer urgently needed a replacement for a discontinued automation component. After reviewing the product label, technical parameters, and application details, our engineers recommended a compatible alternative and provided photos and test videos before shipment. The alternative performed well, enhancing the customer's confidence in our technical capabilities and leading to multiple repeat orders.

India

An Indian customer still had doubts after initial online communication with us, so they visited our company in person for a face-to-face meeting and product inspection. This visit increased the customer's trust and led to the successful placement of their first order. Over the next few years, we completed multiple orders and established a stable, long-term partnership.

Malaysia

A Malaysia customer needed a specific automation component and compared products and services from several suppliers online. After nearly three weeks of careful consideration, our sincere communication, professional service, and reliable product quality won the customer's trust. After receiving the product and using it for several weeks without any problems, the customer gave us positive feedback and subsequently placed multiple orders.

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