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6ES7431-1KF00-0AB0

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For SIMATIC S7-400 racks, Siemens 6ES7431-1KF00-0AB0 is an SM 431 isolated analog input module that converts field voltage, current, or resistance signals into PLC values.
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Technical specifications for 6ES7431-1KF00-0AB0

  • Manufacturer:
    Siemens
  • Part Number:
    6ES7431-1KF00-0AB0
  • Product Family:
    Siemens Simatic S7-400
  • Product Type:
    SIMATIC S7-400 SM 431 Isolated Analog Input Module
  • Stock:
    1
  • Analog Input Channels:
    8 for voltage or current
  • Resistance Inputs:
    4
  • Resolution:
    13 bit
  • Backplane Current at 5 V:
    Maximum 350 mA
  • Power Loss:
    1.8 W
  • Maximum Input Voltage:
    50 V
  • Maximum Input Current:
    50 mA, 40 mA continuous
  • Voltage Input Resistance:
    200 kΩ
  • Current Measurement:
    Supported
  • Resistance Measurement:
    Supported
  • Thermocouple Input:
    Not supported
  • Resistance Thermometer Input:
    Not supported
  • Channel Isolation:
    Analog section isolated from backplane
  • Diagnostic Interrupt:
    Not supported
  • Hardware Interrupt:
    Not supported
  • Weight:
    1.6733 lbs (0.759 kg)
  • Estimated shipping dimensions:
    30.1x23.1x3.8cm
  • Tariff Code:
    85389091
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Signal Paths Resistance Inputs Isolation Layout Value Diagnosis

Features:

  • Eight input paths measure voltage or current signals for the S7-400 process image.
  • Four resistance positions use their assigned wiring arrangement.
  • The analog section remains isolated from the controller backplane.
Range selection determines how each terminal signal is converted to a PLC value.

Input protection limits apply to the physical circuit before software scaling.

The absence of channel interrupts makes raw-value and loop checks part of diagnosis.

The Siemens 6ES7431-1KF00-0AB0 S7-400 SM 431 Analog Input Module may remain available for quotation and support beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6ES7431-1KF00-0AB0 S7-400 SM 431 Analog Input Module Manuals,Datasheets,LinkImportant Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

Converting field signals into controller data

  • Terminal input: Voltage, current or resistance reaches the assigned circuit.
  • Range selection: The configured measuring mode defines the electrical interpretation.
  • A/D conversion: Conditioned signals become 13-bit digital values.
  • Process image: The CPU reads the converted words at the configured module addresses.

Using the four resistance positions without confusing channel counts

  • Connection count: Resistance measurement is available on four assigned positions.
  • Lead path: Terminal arrangement and common reference affect the measured value.
  • Mode setting: The channel must be parameterized for resistance rather than voltage or current.
  • Validation: A known resistance distinguishes wiring error from scaling error.

Separating the field measurement section from the rack

  • Analog section: Field-side measuring circuits share the documented module structure.
  • Backplane boundary: Isolation separates the analog section from S7-400 bus electronics.
  • Reference planning: External signal commons still follow the wiring diagram.
  • Ground check: Shield and reference conductors are inspected before changing parameters.

Investigating incorrect values without channel interrupts

  • Raw word: The unscaled PLC value shows what the converter is reporting.
  • Range match: Hardware wiring and configured range are compared.
  • Loop test: A known source verifies the field circuit and selected input.
  • Protection limit: Applied voltage or current stays below the documented maximum.
Description
Within a SIMATIC S7-400 rack, Siemens 6ES7431-1KF00-0AB0 operates as the SM 431 isolated analog input module for converting field voltage, current and resistance signals into controller process values. Eight electronic input paths serve voltage or current measurement, while resistance connections are organized across four measurement positions.

Before a field signal reaches the CPU, 6ES7431-1KF00-0AB0 conditions the selected range and converts it to a 13-bit digital value for the S7-400 process image. The parameterized measuring mode and the actual terminal wiring must agree because a voltage circuit and a current loop use different electrical paths.

Resistance measurements on 6ES7431-1KF00-0AB0 use the assigned connection arrangement rather than the full eight-channel voltage-current layout. Lead routing, common reference and channel selection therefore determine whether the converted value represents the connected resistor without introducing wiring error.

The analog section of 6ES7431-1KF00-0AB0 is isolated from the S7-400 backplane, but the module does not provide diagnostic or hardware interrupts. Fault isolation must therefore combine the raw PLC value with external loop checks, range settings and the module-level status available to the controller.
Alternative Names
6ES74311KF000AB0 6ES7 431-1KF00-0AB0 6ES7431 1KF00 0AB0 Siemens 6ES7431-1KF00-0AB0 6ES7431-1KF00-0AB0 SM431 SM 431 6ES7431-1KF00-0AB0 6ES 7431 1KF00 0AB0 6ES7431/1KF00/0AB0
Technical notes
Signal type, measuring range, channel wiring, common reference, maximum input levels, and the lack of diagnostic interrupts must be checked for Siemens 6ES7431-1KF00-0AB0.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why does Siemens 6ES7431-1KF00-0AB0 show an incorrect engineering value?
Compare the Siemens 6ES7431-1KF00-0AB0 raw input word, configured range, terminal wiring, common reference, program scaling, and the value applied by a known source.
How many resistance measurements can 6ES7431-1KF00-0AB0 accept?
The 6ES7431-1KF00-0AB0 provides four assigned resistance measurement positions, distinct from its eight voltage or current input paths.
Does Siemens 6ES7431-1KF00-0AB0 generate diagnostic interrupts?
No. Siemens 6ES7431-1KF00-0AB0 does not provide diagnostic interrupts, so diagnosis relies on module status, raw values, range configuration, and external circuit tests.
What must be checked before changing a 6ES7431-1KF00-0AB0 input from voltage to current?
For 6ES7431-1KF00-0AB0, confirm the channel terminals, current-loop source, common reference, parameterized range, and maximum input limits before energizing the circuit.
Which records help replace Siemens 6ES7431-1KF00-0AB0 correctly?
Save the Siemens 6ES7431-1KF00-0AB0 rack slot, channel ranges, resistance assignments, wiring diagram, address map, scaling blocks, and baseline raw values.

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