Siemens 6ES7431-7QH00-0AB0

SM 431 analog input, 16 AI, 16 bit, universal, diagnostics

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Siemens SIMATIC S7-400 SM 431 analog input module: 16 isolated inputs for voltage, current, resistance, thermocouples and resistance thermometers, 16-bit resolution, diagnostics and alarms.

Manufacturer: Siemens
Manufacturer part no.: 6ES7431-7QH00-0AB0
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.: 6ES7431-7QH00-0AB0
Type: Analog input module
Application: Analog input module
Used with: SIMATIC S7-400 rack
Load voltage L+ / Rated value (DC): 24 V; Only required for supplying 2-wire transmitters
Load voltage L+ / Reverse polarity protection: Yes
Input current / from load voltage L+ (without load), max.: 400 mA; for 16 connected, fully controlled 2-wire transmitters
Input current / from backplane bus 5 V DC, max.: 700 mA
Power loss, typ.: 4.5 W
Number of analog inputs: 16
Number of analog inputs / For voltage/current measurement: 16
Number of analog inputs / For resistance measurement: 8
Analog inputs / permissible input voltage for voltage input (destruction limit), max.: 18 V; 18 V continuous, 75 V for 1 ms (mark to space ratio 1:20)
Analog inputs / permissible input current for current input (destruction limit), max.: 40 mA
Analog inputs / Constant measurement current for resistance-type transmitter, typ.: 1.67 mA
Input ranges / Voltage: Yes
Input ranges / Current: Yes
Input ranges / Thermocouple: Yes
Input ranges / Resistance thermometer: Yes
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): 1 MΩ
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): 1 MΩ
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): 1 MΩ
Input ranges (rated values), voltages / -2.5 V to +2.5 V: Yes
Input ranges (rated values), voltages / -2.5 V to +2.5 V / Input resistance (-2.5 V to +2.5 V): 1 MΩ
Input ranges (rated values), voltages / -25 mV to +25 mV: Yes

Show all 139 specifications

Input ranges (rated values), voltages / -25 mV to +25 mV / Input resistance (-25 mV to +25 mV): 1 MΩ
Input ranges (rated values), voltages / -250 mV to +250 mV: Yes
Input ranges (rated values), voltages / -250 mV to +250 mV / Input resistance (-250 mV to +250 mV): 1 MΩ
Input ranges (rated values), voltages / -5 V to +5 V: Yes
Input ranges (rated values), voltages / -5 V to +5 V / Input resistance (-5 V to +5 V): 1 MΩ
Input ranges (rated values), voltages / -50 mV to +50 mV: Yes
Input ranges (rated values), voltages / -50 mV to +50 mV / Input resistance (-50 mV to +50 mV): 1 MΩ
Input ranges (rated values), voltages / -500 mV to +500 mV: Yes
Input ranges (rated values), voltages / -500 mV to +500 mV / Input resistance (-500 mV to +500 mV): 1 MΩ
Input ranges (rated values), voltages / -80 mV to +80 mV: Yes
Input ranges (rated values), voltages / -80 mV to +80 mV / Input resistance (-80 mV to +80 mV): 1 MΩ
Input ranges (rated values), currents / 0 to 20 mA: Yes
Input ranges (rated values), currents / 0 to 20 mA / Input resistance (0 to 20 mA): 50 Ω
Input ranges (rated values), currents / -10 mA to +10 mA: Yes
Input ranges (rated values), currents / -10 mA to +10 mA / Input resistance (-10 mA to +10 mA): 50 Ω
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): 50 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): 50 Ω
Input ranges (rated values), currents / -5 mA to +5 mA: Yes
Input ranges (rated values), currents / -5 mA to +5 mA / Input resistance (-5 mA to +5 mA): 50 Ω
Input ranges (rated values), thermocouples / Type B: Yes
Input ranges (rated values), thermocouples / Type B / Input resistance (Type B): 1 MΩ
Input ranges (rated values), thermocouples / Type E: Yes
Input ranges (rated values), thermocouples / Type E / Input resistance (Type E): 1 MΩ
Input ranges (rated values), thermocouples / Type J: Yes
Input ranges (rated values), thermocouples / Type J / Input resistance (type J): 1 MΩ
Input ranges (rated values), thermocouples / Type K: Yes
Input ranges (rated values), thermocouples / Type K / Input resistance (Type K): 1 MΩ
Input ranges (rated values), thermocouples / Type L: Yes
Input ranges (rated values), thermocouples / Type L / Input resistance (Type L): 1 MΩ
Input ranges (rated values), thermocouples / Type N: Yes
Input ranges (rated values), thermocouples / Type N / Input resistance (Type N): 1 MΩ
Input ranges (rated values), thermocouples / Type R: Yes
Input ranges (rated values), thermocouples / Type R / Input resistance (Type R): 1 MΩ
Input ranges (rated values), thermocouples / Type S: Yes
Input ranges (rated values), thermocouples / Type S / Input resistance (Type S): 1 MΩ
Input ranges (rated values), thermocouples / Type T: Yes
Input ranges (rated values), thermocouples / Type T / Input resistance (Type T): 1 MΩ
Input ranges (rated values), thermocouples / Type U: Yes
Input ranges (rated values), thermocouples / Type U / Input resistance (Type U): 1 MΩ
Input ranges (rated values), resistance thermometer / Ni 100: Yes
Input ranges (rated values), resistance thermometer / Ni 100 / Input resistance (Ni 100): 1 MΩ
Input ranges (rated values), resistance thermometer / Ni 1000: Yes
Input ranges (rated values), resistance thermometer / Ni 1000 / Input resistance (Ni 1000): 1 MΩ
Input ranges (rated values), resistance thermometer / Pt 100: Yes
Input ranges (rated values), resistance thermometer / Pt 100 / Input resistance (Pt 100): 1 MΩ
Input ranges (rated values), resistance thermometer / Pt 1000: Yes
Input ranges (rated values), resistance thermometer / Pt 1000 / Input resistance (Pt 1000): 1 MΩ
Input ranges (rated values), resistance thermometer / Pt 200: Yes
Input ranges (rated values), resistance thermometer / Pt 200 / Input resistance (Pt 200): 1 MΩ
Input ranges (rated values), resistance thermometer / Pt 500: Yes
Input ranges (rated values), resistance thermometer / Pt 500 / Input resistance (Pt 500): 1 MΩ
Input ranges (rated values), resistors / 0 to 48 ohms: Yes
Input ranges (rated values), resistors / 0 to 48 ohms / Input resistance (0 to 48 ohms): 1 MΩ
Input ranges (rated values), resistors / 0 to 150 ohms: Yes
Input ranges (rated values), resistors / 0 to 150 ohms / Input resistance (0 to 150 ohms): 1 MΩ
Input ranges (rated values), resistors / 0 to 300 ohms: Yes
Input ranges (rated values), resistors / 0 to 300 ohms / Input resistance (0 to 300 ohms): 1 MΩ
Input ranges (rated values), resistors / 0 to 300 ohms / 0 to 600 ohms: Yes
Input ranges (rated values), resistors / 0 to 300 ohms / 0 to 600 ohms / Input resistance (0 to 600 ohms): 1 MΩ
Input ranges (rated values), resistors / 0 to 300 ohms / 0 to 6000 ohms: Yes; Usable up to 5000 Ohm
Input ranges (rated values), resistors / 0 to 300 ohms / 0 to 6000 ohms / Input resistance (0 to 6000 ohms): 1 MΩ
Input ranges (rated values), resistors / Thermocouple (TC) / Temperature compensation / Parameterizable: Yes
Input ranges (rated values), resistors / Thermocouple (TC) / Temperature compensation / external temperature compensation with Pt100: Yes
Input ranges (rated values), resistors / Thermocouple (TC) / Temperature compensation / external temperature compensation with compensations socket: Yes
Input ranges (rated values), resistors / Thermocouple (TC) / Temperature compensation / dynamic reference temperature value: Yes
Input ranges (rated values), resistors / Characteristic linearization / Parameterizable: Yes
Input ranges (rated values), resistors / Characteristic linearization / Parameterizable / for thermocouples: Type B, E, J, K, L, N, R, S, T, U
Input ranges (rated values), resistors / Characteristic linearization / Parameterizable / for resistance thermometer: Pt100, Pt200, Pt500, Pt1000, Ni100, Ni1000
Input ranges (rated values), resistors / Cable length / shielded, max.: 200 m; 50 m with thermocouples and input ranges ≤ 80 mV
Integration and conversion time/resolution per channel / Resolution with overrange (bit including sign), max.: 16 bit; 16 / 16 / 16
Integration and conversion time/resolution per channel / Integration time, parameterizable: Yes
Integration and conversion time/resolution per channel / Basic conversion time (ms): 6 / 20,1 / 23,5 ms
Integration and conversion time/resolution per channel / Integration time (ms): 2,5 / 16,7 / 20 ms
Integration and conversion time/resolution per channel / Interference voltage suppression for interference frequency f1 in Hz: 400 / 60 / 50 Hz
Connection of signal encoders / for voltage measurement: Yes; possible
Connection of signal encoders / for current measurement as 2-wire transducer: Yes
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
Connection of signal encoders / for resistance measurement with four-wire connection: Yes
Errors/accuracies / Temperature error (relative to input range), (+/-): 0.004 %/K
Operational error limit in overall temperature range / Voltage, relative to input range, (+/-): 0.3 %; ±0.3 % at ±250 mV, ±500 mV, ±1 V, ±2.5 V, ±5 V, 1 to 5 V, ±10 V; ±0.31 % at ±80 mV; ±0.32 % at ±50 mV; ±0.35 % at ±25 mV
Operational error limit in overall temperature range / Current, relative to input range, (+/-): 0.3 %; at 0 to 20 mA, ±5 mA, ±10 mA, ±20 mA, 4 to 20 mA
Operational error limit in overall temperature range / Resistance, relative to input range, (+/-): 0.3 %; ±0.3% at 0 to 48 Ohm (4-conductor measurement), 0 to 150 Ohm (4- conductor measurement), 0 to 300 Ohm (4-conductor measurement), 0 to 600 Ohm (4-conductor measurement), 0 to 5000 Ohm (4-conductor measurement, in range of 6000 Ohm); ±0.4% at 0 to 300 Ohm (3-conductor measurement), 0 to 600 Ohm (3-conductor measurement), 0 to 5000 Ohm (3-conductor measurement, in range of 6000 Ohm);
Operational error limit in overall temperature range / Resistance thermometer, relative to input range, (+/-): 0.4 %
Operational error limit in overall temperature range / Thermocouple, relative to input range, (+/-): TC Type B (±11.5 K), TC Type R (±7.3 K), TC Type S (±8.3 K), TC Type T (±1.7 K), TC Type E (±3.2 K), TC Type J (±4.3 K), TC Type K (±6.2 K), TC Type U (±2.8 K), TC Type L (±4.2 K), TC Type N (±4.4 K)
Basic error limit (operational limit at 25 °C) / Voltage, relative to input range, (+/-): 0.15 %; ±0.15% at ±250 mV, ±500 mV, ±1 V, ±2.5 V, ±5 V, 1 V to 5 V, ±10 V; ±0.17% at ±80 mV; ±0.19% at ±50 mV; ±0.23% at ±25 mV
Basic error limit (operational limit at 25 °C) / Current, relative to input range, (+/-): 0.15 %; at 0 to 20 mA, ±5 mA, ±10 mA, ±20 mA, 4 to 20 mA
Basic error limit (operational limit at 25 °C) / Resistance, relative to input range, (+/-): 0.15 %; ±0.15 % at 0 to 48 ohms (4-conductor measurement), 0 to 150 ohms (4-conductor measurement), 0 to 300 ohms (4-conductor measurement), 0 to 5000 ohms (4-conductor measurement, in range of 6000 ohms); ±0.3 % at 0 to 300 ohms (3-conductor measurement), 0 to 600 ohms (3-conductor measurement), 0 to 5000 ohms (3-conductor measurement, in range of 6000 ohms)
Basic error limit (operational limit at 25 °C) / Resistance thermometer, relative to input range, (+/-): 0.3 %
Basic error limit (operational limit at 25 °C) / Thermocouple, relative to input range, (+/-): TC Type B (±7.6 K), TC Type R (±4.8 K) TC Type S (±5.4 K), TC Type T (±1.1 K), TC Type E (±1.8 K), TC Type J (±2.3 K), TC Type K (±3.4 K), TC Type U (±1.7 K), TC Type L (±2.3 K), TC Type N (±2.6 K)
Interrupts/diagnostics/status information / Diagnostics function: Yes; Parameterizable
Alarms / Diagnostic alarm: Yes; Parameterizable
Alarms / Limit value alarm: Yes; Parameterizable
Alarms / Hardware interrupt: Yes; Parameterizable
Diagnoses / Diagnostic information readable: Yes
Diagnostics indication LED / internal fault INTF (red): Yes
Diagnostics indication LED / external fault EXTF (red): Yes
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
Potential separation analog inputs / Between the channels and load voltage L+: Yes
Isolation tested with: 2 120 V DC between bus and L+/M; 2 120 V DC between bus and analog section; 500 V DC between bus and local ground; 500 V DC between analog section and L+/M; 2 120 V DC between analog section and local ground; 2 120 V DC between L+/M and local ground
Width: 25 mm
Height: 290 mm
Depth: 210 mm
Weight, approx.: 500 g

Technical documents (1)

Siemens data sheet 6ES7431-7QH00-0AB0

Key features

16 inputs for voltage or current, 8 for resistance or resistance thermometers
Voltage ranges from ±25 mV to ±10 V; current from ±5 mA to ±20 mA and 4 to 20 mA
Thermocouple types B, E, J, K, L, N, R, S, T and U; Pt and Ni resistance thermometers
16-bit resolution; diagnostics and alarms
Discontinued by Siemens on 1 October 2026

About the Siemens 6ES7431-7QH00-0AB0

The Siemens 6ES7431-7QH00-0AB0 is the high-end SM 431: 16 inputs at 16-bit resolution covering voltage, current, resistance, thermocouples and resistance thermometers, where the 8-channel 6ES7431-1KF10-0AB0 works at 14 bits. Siemens's data sheet gives voltage ranges from ±25 mV to ±10 V, current ranges down to ±5 mA, 8 channels for resistance measurement, diagnostics and alarms, and 4.5 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 6ES7431-7QH00-0AB0 used for?

It reads up to 16 temperatures and transmitter signals into an S7-400 CPU at high 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: 7QH00 is the 16-channel universal module.

Other parts in the Siemens SIMATIC S7-400 family

Listed for reference. They differ from the 6ES7431-7QH00-0AB0 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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