Siemens 6ES7431-1KF00-0AB0

SM 431 analog input, 8 AI, 13 bit, U/I/R

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Siemens SIMATIC S7-400 SM 431 analog input module: 8 isolated inputs for voltage or current (4 for resistance), 13-bit resolution.

Manufacturer: Siemens
Manufacturer part no.: 6ES7431-1KF00-0AB0
Product family: SIMATIC S7-400 PLC CPUs, I/O and Function Modules
Type: Analog input module
Category: PLCs and I/O › Analogue I/O modules
Lifecycle: Discontinued
OEM successor: Not stated
Technical datasheet: Data sheet

Technical specifications

Manufacturer: Siemens
Manufacturer part no.: 6ES7431-1KF00-0AB0
Type: Analog input module
Application: Analog input module
Used with: SIMATIC S7-400 rack
Load voltage L+ / Rated value (DC): not necessary
Input current / from backplane bus 5 V DC, max.: 350 mA
Power loss, typ.: 1.8 W
Number of analog inputs: 8
Number of analog inputs / For voltage/current measurement: 8
Number of analog inputs / For resistance measurement: 4
Analog inputs / permissible input voltage for voltage input (destruction limit), max.: 50 V
Analog inputs / permissible input current for current input (destruction limit), max.: 50 mA; 40 mA continuous
Analog inputs / Constant measurement current for resistance-type transmitter, typ.: 1.67 mA
Input ranges / Voltage: Yes
Input ranges / Current: Yes
Input ranges / Thermocouple: No
Input ranges / Resistance thermometer: No
Input ranges / Resistance: Yes
Input ranges (rated values), voltages / 1 V to 5 V: Yes
Input ranges (rated values), voltages / 1 V to 5 V / Input resistance (1 V to 5 V): 200 kΩ
Input ranges (rated values), voltages / -1 V to +1 V: Yes
Input ranges (rated values), voltages / -1 V to +1 V / Input resistance (-1 V to +1 V): 200 kΩ
Input ranges (rated values), voltages / -10 V to +10 V: Yes
Input ranges (rated values), voltages / -10 V to +10 V / Input resistance (-10 V to +10 V): 200 kΩ
Input ranges (rated values), currents / -20 mA to +20 mA: Yes
Input ranges (rated values), currents / -20 mA to +20 mA / Input resistance (-20 mA to +20 mA): 80 Ω
Input ranges (rated values), currents / 4 mA to 20 mA: Yes
Input ranges (rated values), currents / 4 mA to 20 mA / Input resistance (4 mA to 20 mA): 80 Ω
Input ranges (rated values), resistors / 0 to 600 ohms: Yes

Show all 60 specifications

Input ranges (rated values), resistors / 0 to 600 ohms / Input resistance (0 to 600 ohms): usable up to 500 ohms
Cable length / shielded, max.: 200 m
Integration and conversion time/resolution per channel / Resolution with overrange (bit including sign), max.: 13 bit
Integration and conversion time/resolution per channel / Integration time, parameterizable: Yes
Integration and conversion time/resolution per channel / Basic conversion time (ms): 23 / 25 ms
Integration and conversion time/resolution per channel / Integration time (ms): 16,7 / 20 ms
Integration and conversion time/resolution per channel / Interference voltage suppression for interference frequency f1 in Hz: 50 / 60 Hz
Integration and conversion time/resolution per channel / Basic execution time of the module (all channels released): 200 ms; 184 / 200 ms
Connection of signal encoders / for voltage measurement: Yes; possible
Connection of signal encoders / for current measurement as 2-wire transducer: Yes; with external transmitter supply
Connection of signal encoders / for current measurement as 4-wire transducer: Yes
Connection of signal encoders / for resistance measurement with two-wire connection: Yes; Line resistances are also measured
Connection of signal encoders / for resistance measurement with three-wire connection: Yes; Line resistances are also measured
Connection of signal encoders / for resistance measurement with four-wire connection: Yes
Errors/accuracies / Temperature error (relative to input range), (+/-): 0.02 %/K; ±0.02 %/K in impedance measuring range; ±0.007 % in all other measuring ranges
Operational error limit in overall temperature range / Voltage, relative to input range, (+/-): 1 %; ±1.0 % at ±1 V; ±0.6 % at ±10 V; ±0.7 % at 1 to 5 V
Operational error limit in overall temperature range / Current, relative to input range, (+/-): 1 %; at ±20 mA, 4 to 20 mA
Operational error limit in overall temperature range / Resistance, relative to input range, (+/-): 1.25 %; 0 to 500 ohms (4-conductor measurement, in range of 600 ohms)
Basic error limit (operational limit at 25 °C) / Voltage, relative to input range, (+/-): 0.7 %; 0.7% at ±1 V; 0.4% at ±10 V; 0.5% at 1 to 5 V
Basic error limit (operational limit at 25 °C) / Current, relative to input range, (+/-): 0.7 %; at ±20 mA, 4 to 20 mA
Basic error limit (operational limit at 25 °C) / Resistance, relative to input range, (+/-): 0.8 %; 0 to 500 ohms (4-conductor measurement, in range of 600 ohms)
Interrupts/diagnostics/status information / Diagnostics function: No
Potential separation analog inputs / Potential separation analog inputs: Yes; internal/external
Potential separation analog inputs / between the channels: No
Potential separation analog inputs / between the channels and backplane bus: Yes
Isolation tested with: 2 120 V DC between bus and analog part; 500 V DC between bus and local ground; 2 120 V DC between analog part and local ground
Width: 25 mm
Height: 290 mm
Depth: 210 mm
Weight, approx.: 500 g

Technical documents (1)

Siemens data sheet 6ES7431-1KF00-0AB0

Key features

8 analog inputs for voltage or current, 4 for resistance
Ranges: ±1 V, ±10 V, 1 to 5 V, ±20 mA, 4 to 20 mA, 0 to 600 Ω
13-bit resolution
No load voltage needed
Discontinued by Siemens on 1 October 2026

About the Siemens 6ES7431-1KF00-0AB0

The Siemens 6ES7431-1KF00-0AB0 is the basic 8-channel SM 431 at 13-bit resolution; the 6ES7431-1KF10-0AB0 adds 14-bit resolution, thermocouples and resistance thermometers. Siemens's data sheet gives 8 inputs for ±1 V, ±10 V, 1 to 5 V, ±20 mA and 4 to 20 mA, or 4 for resistance up to 600 Ω, and 1.8 W typical power loss. SiePortal shows its phase-out announced on 1 October 2025 and its product cancellation on 1 October 2026.

What is the 6ES7431-1KF00-0AB0 used for?

It reads transmitters and other analog signals into an S7-400 CPU.

Lifecycle and successor

Discontinued.

Before you order

What to photograph or confirm so the right unit is quoted.

Check the order number on the module: 1KF00 (13 bit), 1KF10 (14 bit with temperature ranges) and 1KF20 (14 bit, fast) are different modules.

Other parts in the Siemens SIMATIC S7-400 family

Listed for reference. They differ from the 6ES7431-1KF00-0AB0 in rating, supply, interface or function and are not interchangeable with it unless Siemens says so. Match the part number on your unit.

Product	Type	Lifecycle	Qty Available	Price	Action
Siemens 6ES7421-7DH00-0AB0SM 421 digital input, 16 DI, 24 to 60 V AC/DC, interrupt and diagnostics	Digital input module	Discontinued	On Request	On request	View
Siemens 6ES7422-1BH11-0AA0SM 422 digital output, 16 DO, 24 V DC, 2 A	Digital output module	Discontinued	On Request	On request	View
Siemens 6ES7422-7BL00-0AB0SM 422 digital output, 32 DO, 24 V DC, 0.5 A, diagnostics	Digital output module	Discontinued	On Request	On request	View
Siemens 6ES7422-1FH00-0AA0SM 422 digital output, 16 DO, 120/230 V AC, 2 A	Digital output module	Discontinued	On Request	On request	View
Siemens 6ES7422-1HH00-0AA0SM 422 relay output, 16 DO, 5 A	Digital output module	Discontinued	On Request	On request	View
Siemens 6ES7431-1KF10-0AB0SM 431 analog input, 8 AI, 14 bit, U/I/R/thermocouple/RTD	Analog input module	Discontinued	On Request	On request	View
Siemens 6ES7431-1KF20-0AB0SM 431 analog input, 8 AI, 14 bit, 0.42 ms for all channels	Analog input module	Discontinued	On Request	On request	View
Siemens 6ES7431-7QH00-0AB0SM 431 analog input, 16 AI, 16 bit, universal, diagnostics	Analog input module	Discontinued	On Request	On request	View
Siemens 6ES7431-7KF00-0AB0SM 431 analog input, 8 AI, 16 bit, U/I/thermocouple	Analog input module	Discontinued	On Request	On request	View
Siemens 6ES7431-7KF10-0AB0SM 431 analog input, 8 AI, 16 bit, resistance thermometers	Analog input module	Discontinued	On Request	On request	View
Siemens 6ES7431-0HH00-0AB0SM 431 analog input, 16 AI, 13 bit, non-isolated	Analog input module	Discontinued	On Request	On request	View
Siemens 6ES7432-1HF00-0AB0SM 432 analog output, 8 AO, 13 bit, U/I	Analog output module	Discontinued	On Request	On request	View

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