Siemens 6ES7431-7KF00-0AB0
SM 431 analog input, 8 AI, 16 bit, U/I/thermocouple
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Siemens SIMATIC S7-400 SM 431 analog input module: 8 isolated inputs for voltage, current and thermocouples, 16-bit resolution, diagnostics and alarms.
- Manufacturer
- Siemens
- Manufacturer part no.
- 6ES7431-7KF00-0AB0
- 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.
- 6ES7431-7KF00-0AB0
- Type
- Analog input module
- Application
- Analog input module
- Used with
- SIMATIC S7-400 rack
- Input current / from backplane bus 5 V DC, max.
- 1 200 mA
- Power loss, typ.
- 4.6 W
- Number of analog inputs
- 8
- Number of analog inputs / For voltage/current measurement
- 8
- Analog inputs / permissible input voltage for voltage input (destruction limit), max.
- 35 V; 35 V continuous, 75 V for max. 1 s (mark to space ratio 1:20)
- Analog inputs / permissible input current for current input (destruction limit), max.
- 32 mA
- Input ranges / Voltage
- Yes
- Input ranges / Current
- Yes
- Input ranges / Thermocouple
- Yes
- Input ranges / Resistance thermometer
- No
- Input ranges / Resistance
- No
- 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)
- > 2 000 ohms
- Input ranges (rated values), voltages / -1 V to +1 V
- Yes
- Input ranges (rated values), voltages / -10 V to +10 V
- Yes
- Input ranges (rated values), voltages / -100 mV to +100 mV
- Yes
- Input ranges (rated values), voltages / -2.5 V to +2.5 V
- Yes
- Input ranges (rated values), voltages / -20 mV to +20 mV
- Yes
- Input ranges (rated values), voltages / -250 mV to +250 mV
- Yes
- Input ranges (rated values), voltages / -5 V to +5 V
- Yes
- Input ranges (rated values), voltages / -50 mV to +50 mV
- Yes
- Input ranges (rated values), voltages / -500 mV to +500 mV
- Yes
- Input ranges (rated values), voltages / -80 mV to +80 mV
- Yes
- Input ranges (rated values), currents / 0 to 20 mA
- Yes
- Input ranges (rated values), currents / -10 mA to +10 mA
- Yes
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- Input ranges (rated values), currents / -20 mA to +20 mA
- Yes
- Input ranges (rated values), currents / -3.2 mA to +3.2 mA
- Yes
- 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)
- 50 Ω
- Input ranges (rated values), currents / -5 mA to +5 mA
- Yes
- Input ranges (rated values), thermocouples / Type B
- Yes
- Input ranges (rated values), thermocouples / Type B / Input resistance (Type B)
- > 2 000 ohms
- Input ranges (rated values), thermocouples / Type E
- Yes
- Input ranges (rated values), thermocouples / Type J
- Yes
- Input ranges (rated values), thermocouples / Type K
- Yes
- Input ranges (rated values), thermocouples / Type L
- Yes
- Input ranges (rated values), thermocouples / Type N
- Yes
- Input ranges (rated values), thermocouples / Type N / Input resistance (Type N)
- > 2 000 ohms
- Input ranges (rated values), thermocouples / Type R
- Yes
- Input ranges (rated values), thermocouples / Type S
- Yes
- Input ranges (rated values), thermocouples / Type T
- Yes
- Input ranges (rated values), thermocouples / Type U
- Yes
- Thermocouple (TC) / Temperature compensation / connection for compensating the cold junction
- 6ES7431-7KF00-6AA0
- Thermocouple (TC) / Temperature compensation / Parameterizable
- Yes
- Thermocouple (TC) / Temperature compensation / internal temperature compensation
- Yes
- Thermocouple (TC) / Temperature compensation / external temperature compensation with compensations socket
- Yes
- Thermocouple (TC) / Temperature compensation / dynamic reference temperature value
- Yes
- Characteristic linearization / Parameterizable
- Yes
- Characteristic linearization / Parameterizable / for thermocouples
- Type B, E, J, K, L, N, R, S, T, U
- Cable length / shielded, max.
- 200 m
- Integration and conversion time/resolution per channel / Resolution with overrange (bit including sign), max.
- 16 bit
- Integration and conversion time/resolution per channel / Integration time, parameterizable
- Yes
- Integration and conversion time/resolution per channel / Basic conversion time (ms)
- 10 / 16,7 / 20 / 100
- Integration and conversion time/resolution per channel / Integration time (ms)
- 2,5 / 16,7 / 20 / 100
- Integration and conversion time/resolution per channel / Interference voltage suppression for interference frequency f1 in Hz
- 400 / 60 / 50 / 10 Hz
- Connection of signal encoders / for voltage measurement
- Yes; possible
- Connection of signal encoders / for current measurement as 4-wire transducer
- Yes
- Connection of signal encoders / for resistance measurement with four-wire connection
- Yes
- Operational error limit in overall temperature range / Voltage, relative to input range, (+/-)
- 0.3 %
- Operational error limit in overall temperature range / Current, relative to input range, (+/-)
- 0.5 %
- Basic error limit (operational limit at 25 °C) / Voltage, relative to input range, (+/-)
- 0.1 %
- Basic error limit (operational limit at 25 °C) / Current, relative to input range, (+/-)
- 0.17 %
- Interrupts/diagnostics/status information / Diagnostics function
- Yes; Parameterizable
- Alarms / Diagnostic alarm
- Yes; Parameterizable
- Alarms / Limit value alarm
- Yes
- Alarms / Hardware interrupt
- Yes; Parameterizable
- Diagnoses / Diagnostic information readable
- Yes; possible
- Potential separation analog inputs / Potential separation analog inputs
- Yes; internal/external
- Potential separation analog inputs / between the channels
- Yes
- Potential separation analog inputs / between the channels and backplane bus
- Yes
- Isolation tested with
- 1 500 V DC
- Width
- 25 mm
- Height
- 290 mm
- Depth
- 210 mm
- Weight, approx.
- 650 g
Technical documents (1)
Key features
- 8 inputs for voltage, current or thermocouples
- Thermocouple types B, E, J, K, L, N, R, S, T and U
- Internal or external cold-junction compensation
- 16-bit resolution; diagnostics and alarms
- Discontinued by Siemens on 1 October 2026
About the Siemens 6ES7431-7KF00-0AB0
The Siemens 6ES7431-7KF00-0AB0 is the 16-bit SM 431 for voltage, current and thermocouples; its companion, the 6ES7431-7KF10-0AB0, takes resistance thermometers instead. Siemens's data sheet gives voltage ranges from ±20 mV to ±10 V, current ranges from ±3.2 mA to ±20 mA and 0/4 to 20 mA, thermocouple types B, E, J, K, L, N, R, S, T and U, internal or external cold-junction compensation (connection 6ES7431-7KF00-6AA0), and 4.6 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 6ES7431-7KF00-0AB0 used for?
It reads thermocouple temperatures and transmitter signals into an S7-400 CPU at 16-bit resolution.
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: 7KF00 is for voltage, current and thermocouples, 7KF10 for resistance thermometers.
Other parts in the Siemens SIMATIC S7-400 family
Listed for reference. They differ from the 6ES7431-7KF00-0AB0 in rating, supply, interface or function and are not interchangeable with it unless Siemens says so. Match the part number on your unit.
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