The SIMATIC S7-400 (Model: 6ES7431-7QH00-0AB0) is an advanced automation solution designed to elevate industrial processes. With a rated voltage of 24V DC and input current of 700mA, it ensures stable and efficient performance, even in challenging operational conditions. This unit operates reliably across a temperature range of -20C to 60C, with exceptional humidity tolerance up to 95%. Engineered with a power rating of 4.5W, it delivers optimal energy efficiency during prolonged use. The compact design features dimensions of 25 x 290 x 210mm and a lightweight build of 500g, making it suitable for DIN-rail mounting applications. Its durable IP20 protection level safeguards components while maintaining high operational standards. Ideal for automation applications, the SIMATIC S7-400 is built to handle industrial challenges with precision and reliability.

Siemens 6ES7431-7QH00-0AB0 SM 431 Analog Input Module

SIMATIC S7-400 | 16 AI | 16-bit Resolution | Isolated | Voltage / Current / Resistance / TC / RTD (Pt100)
Supports Alarms, Diagnostics, and 2-wire transmitter supply.

Supply Voltage

• Load Voltage (L+): 24 V DC (for 2-wire transmitters)

• Reverse Polarity Protection: Yes

Input Current

• From L+ (no load): Max. 400 mA (for 16 transmitters)

• From Backplane Bus (5 V DC): Max. 700 mA

Power Loss

• Typical: 4.5 W

Analog Inputs

• Total Channels: 16

• Voltage/Current Inputs: 16

• Resistance Measurement Inputs: 8

• Max Voltage (destruction limit): 18 V continuous, 75 V for 1 ms

• Max Current (destruction limit): 40 mA

• Measurement Current (resistance): 1.67 mA

Supported Input Types

• Voltage: Yes

• Current: Yes

• Thermocouples (TC): Yes

• RTDs (Pt/Ni): Yes

• Resistors: Yes

Voltage Ranges (Rated)

• 15 V (Input resistance: 1 M)

• 1 V (1 M)

• 10 V (1 M)

• 2.5 V (1 M)

• 25 mV (1 M)

• 250 mV (1 M)

• 5 V (1 M)

• 50 mV (1 M)

• 500 mV (1 M)

• 80 mV (1 M)

Current Ranges (Rated)

• 020 mA (50 )

• 10 mA (50 )

• 20 mA (50 )

• 420 mA (50 )

• 5 mA (50 )

Thermocouples Supported

Types: B, E, J, K, L, N, R, S, T, U

• Input resistance for all: 1 M

RTDs Supported

• Ni100, Ni1000

• Pt100, Pt1000

• Pt200, Pt500

• Input resistance for all: 1 M

Resistor Measurement Ranges

• 048 (1 M)

• 0150 (1 M)

• 0300 (1 M)

• 0600 (1 M)

• 06000 (usable up to 5000 )

Thermocouple Temperature Compensation

• Parameterizable

• External Pt100 compensation

• Compensation socket

• Dynamic reference temperature

Cable Length

• Shielded: Up to 200 m

• TC ranges 80 mV: Max. 50 m

Analog Value Processing

• Resolution: 16-bit

• Integration Time: Parameterizable

• Basic Conversion Time: 6 / 20.1 / 23.5 ms

• Integration Times: 2.5 / 16.7 / 20 ms

• Noise Suppression: 400 / 60 / 50 Hz

Encoder Connections

• Voltage signals

• Current: 2-wire or 4-wire

• Resistance: 2-wire / 3-wire / 4-wire

Accuracy

Operational Error (Full Temperature Range)

• Voltage: 0.3%

• Current: 0.3%

• Resistance: 0.3% (4-wire), 0.4% (3-wire)

• RTD: 0.4%

• Thermocouple:

  • Type B: 11.5 K

  • Type R: 7.3 K

  • Type S: 8.3 K

  • Type T: 1.7 K

  • Type E: 3.2 K

  • Type J: 4.3 K

  • Type K: 6.2 K

  • Type U: 2.8 K

  • Type L: 4.2 K

  • Type N: 4.4 K

Basic Error (at 25C)

• Voltage: 0.15%

• Current: 0.15%

• Resistance: 0.15% (4-wire), 0.3% (3-wire)

• RTD: 0.3%

• Thermocouple:

  • B: 7.6 K

  • R: 4.8 K

  • S: 5.4 K

  • T: 1.1 K

  • E: 1.8 K

  • J: 2.3 K

  • K: 3.4 K

  • U: 1.7 K

  • L: 2.3 K

  • N: 2.6 K

Diagnostics & Interrupts

• Diagnostic functions (parameterizable)

• Diagnostic alarms

• Limit alarms

• Hardware interrupts

• Diagnostic buffer readable

• LED Indicators:

  • INTF (internal fault)

  • EXTF (external fault)

Isolation / Potential Separation

• Inputs isolated from backplane bus

• No isolation between channels

• Isolation between analog section, L+, and ground

• Tested with 2120 V DC (various paths)

Mechanical Data

• Width: 25 mm

• Height: 290 mm

• Depth: 210 mm

• Weight: Approx. 500 g

Technical Details 

FAQs of SIMATIC S7-400 6ES7431-7QH00-0AB0: