SIMATIC S7-400 SM 431 8-input Voltage / current / resistance module / 6ES7431-1KF20-0AB0

6ES7431-1KF20-0AB0: SM 431 analog input module. Channel count and resolution retain measurement-mode conditions. Verify sensor types, wiring and channel-isolation requirements before ordering.

Manufacturer part number: 6ES7431-1KF20-0AB0
Brand: Siemens
Category: PLC and HMI
Catalog status: Request a quotation

Technical specifications

Controller family: SIMATIC S7-400
Module designation: SM 431
Analog inputs: 8
Analog outputs: 0
Input types: Voltage / current / resistance
Input resolution: 14 bits
Resolution scope: Manufacturer maximum including sign and overrange; measurement-mode and filtering conditions apply
Input galvanic isolation: Yes; internal/external
Channel-to-channel isolation: No
Maximum 5 V backplane current (mA): 1000
Dimensions (W x H x D): 25 x 290 x 210 mm
Approximate weight (g): 500
Document pages: PDF 62, 64, 65, 69
Current lifecycle status: Not established by historical catalogue; confirm separately
Resistance measurement inputs: 4
Voltage/current measurement inputs: 8

Manufacturer technical catalog · SIMATIC ST 400 / May 2017 · en · PDF · ST 400 / May 2017 / E86060-K4678-A151-A1-7600Manufacturer source: Siemens · Model explicitly covered in family document · Covered models: 6ES7431-1KF20-0AB0 · Checked: 2026-10-22Official manufacturer source

This sheet provides a quick technical summary. For design, installation and final selection, review the latest official manufacturer documentation and verify the complete part number.