The SIMATIC S7-400 6ES7431-7KF10-0AB0 is a robust, high-performance automation module designed for industrial applications. With DIN-rail mounting compatibility and a compact design measuring 25 x 290 x 210 mm, it ensures seamless integration into existing systems. Operating on a rated 24V DC input and consuming a mere 3.3 W of power, the device is optimized for energy efficiency. It features an IP20 protection level, safeguarding it against foreign objects and providing reliable performance in humidity levels up to 95%. Built to withstand challenging conditions, it operates effectively within a temperature range of -20C to +60C. The lightweight design, weighing only 650 grams, simplifies handling and installation. With a frequency range of 50/60 Hz and 650 mA input current, this automation module synchronizes perfectly with various industrial setups, offering durable performance and effective isolation up to 500 V DC. The SIMATIC S7-400 is ideal for automation systems requiring precision and reliability.

Siemens 6ES7431-7KF10-0AB0 SM 431 Analog Input Module

SIMATIC S7-400
8-channel analog input module, 16-bit, supports resistance / RTD (PT100/PT1000/Ni100).
Isolated inputs with diagnostic alarms and 20 ms conversion time.

1. Power & Current

• Backplane bus current: max. 650 mA (5 V DC)

• Power loss: typ. 3.3 W

2. Analog Inputs

• Number of inputs: 8

• Resistance measurement: 8 channels

Permissible Input Voltage (destruction limit)

• Continuous: 35 V

• 1 second peak: 75 V (1:20 duty cycle)

Constant Measurement Current

• Typical: 1 mA

3. Supported Input Types

• Voltage: No

• Current: No

• Thermocouple: No

• Resistance thermometer (RTD): Yes

• Resistance measurement: Yes

4. Supported RTD Types

With selectable characteristics (Europe/U.S.)

• Ni100 (R > 10,000 )

• Ni1000 (R > 10,000 )

• Pt100 (R > 10,000 )

• Pt1000 (R > 10,000 )

• Pt200 (R > 10,000 )

• Pt500 (R > 10,000 )

Characteristic Linearization

• Parameterizable for all RTD types above

5. Cable Length

• Shielded cables: max. 200 m

• For thermocouples 80 mV range: max. 50 m

6. Analog Value Generation

• Resolution (incl. sign): 16 bit

• Integration time: parameterizable

• Basic conversion time: 8 ms / 23 ms / 25 ms

• Integration time at 50 Hz: 20 ms (incl. wire break detection)

• Noise suppression: none / 60 Hz / 50 Hz

• Module execution time (all channels): 8 ms

7. Encoder Connections

• 3-wire RTD measurement: Yes

• 4-wire RTD measurement: Yes

8. Accuracy

Operational Error (full temperature range)

• RTD: 1C

Basic Error at 25C

• RTD: 0.2C

9. Diagnostics & Alarms

• Diagnostic functions: Yes (parameterizable)

• Diagnostic alarm: Yes

• Limit value alarm: Yes

• Hardware interrupt: Yes

• Diagnostic information readable: Yes

10. Isolation / Potential Separation

• Between module and backplane bus: Yes

• Internal/external inputs isolated: Yes

• Between channels: No

• Isolation tested at: 500 V DC

11. Mechanical Specifications

• Width: 25 mm

• Height: 290 mm

• Depth: 210 mm

• Weight: approx. 650 g

Technical Details 

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