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6ES7431-1KF20-0AB0

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The Siemens 6ES7431-1KF20-0AB0 SM 431 is an isolated SIMATIC S7-400 analog input module that converts voltage, current or resistance signals into controller data.
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Technical specifications for 6ES7431-1KF20-0AB0

  • Manufacturer:
    Siemens
  • Part Number:
    6ES7431-1KF20-0AB0
  • Product Family:
    Siemens Simatic S7-400
  • Product Type:
    SIMATIC S7-400 SM 431 Analog Input Module
  • Stock:
    1
  • Analog Inputs:
    8 for voltage or current
  • Resistance Inputs:
    4
  • Resolution:
    14 bit
  • Module Cycle Time:
    0.416 ms
  • Basic Conversion Time:
    52 μs
  • Resistance Connection:
    2-, 3- or 4-wire
  • Two-Wire Transmitter Supply:
    24 V DC load supply required
  • Backplane Current:
    1 A maximum at 5 V DC
  • Maximum Load-Supply Current:
    200 mA for eight fully controlled transmitters
  • Typical Power Loss:
    4.9 W
  • Shielded Cable Length:
    200 m maximum
  • Input Filter Time Constant:
    15 μs
  • Diagnostics Function:
    No
  • Isolation:
    Inputs isolated from backplane; internal/external potential separation
  • Operating Temperature:
    0 to 60 °C horizontal; 0 to 40 °C vertical
  • Weight:
    1.7924 lbs (0.813 kg)
  • Estimated shipping dimensions:
    23.1x29.6x3.8cm
  • 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 Selection Transmitter Supply Resistance Wiring Conversion Path

Features:

  • Eight channels acquire voltage or current signals.
  • Four paths can measure resistance with 2-, 3- or 4-wire circuits.
  • Isolation separates the analog section from the S7-400 backplane.
The selected measuring mode determines terminal use and value scaling.

Two-wire transmitters draw power from the external 24 V DC load supply.

Released channels are converted within the documented module cycle.

The Siemens 6ES7431-1KF20-0AB0 S7-400 SM 431 Analog Input Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6ES7431-1KF20-0AB0 S7-400 SM 431 Analog Input Module Manuals,Datasheets,Link Important 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.

Assigning each input to the required measurement method

  • Voltage input: The selected voltage range defines how the terminal level becomes a digital value.
  • Current input: Active or two-wire transmitter circuits follow their documented current wiring.
  • Resistance input: Four measurement paths accept the supported resistance connection methods.
  • Parameter match: Signal type, range and terminal assignment must agree before values are evaluated.

Feeding two-wire devices without combining every measurement reference

  • Load voltage: An external 24 V DC source powers connected two-wire transmitters.
  • Current demand: The maximum load-supply current applies with all eight transmitters controlled.
  • Passive signals: Other documented input circuits do not use the transmitter feed in the same way.
  • Reverse polarity: The load input includes the specified polarity protection.

Separating sensor resistance from lead resistance

  • Two-wire circuit: Sensor and lead resistance appear in the same measurement path.
  • Three-wire circuit: A matched additional conductor compensates the documented lead contribution.
  • Four-wire circuit: Separate force and sense conductors isolate lead drop from the sensor value.
  • Channel count: Resistance mode is available on four of the module measurement paths.

Moving analog levels through conversion and backplane isolation

  • Input filter: The front-end filter conditions the selected field signal.
  • Converter: A released channel is digitized with 14-bit resolution.
  • Module cycle: All active channels are processed within the documented update interval.
  • Backplane boundary: The resulting values cross the isolated interface to the S7-400 CPU.
Description
Voltage, current and resistance measurements enter the S7-400 through Siemens 6ES7431-1KF20-0AB0, an isolated SM 431 analog input module. Eight channels accept voltage or current signals, while four measurement paths can be assigned to resistance circuits.

When 6ES7431-1KF20-0AB0 is configured for a two-wire transmitter, the external 24 V DC load supply feeds the connected transmitters and the module measures their current. Passive voltage, current or resistance circuits use their documented wiring without treating that transmitter supply as the measurement reference.

Resistance measurement on 6ES7431-1KF20-0AB0 can use two-, three- or four-wire connection. The additional sense conductors in the three- and four-wire arrangements let the module separate lead resistance from the sensor value according to the selected circuit.

Each released channel of 6ES7431-1KF20-0AB0 is converted within the module cycle before its value reaches the S7-400 backplane. Isolation separates the analog section from controller electronics, while shielded routing limits interference over the documented cable length.
Alternative Names
6ES74311KF200AB0 6ES7 431-1KF20-0AB0 6ES7431 1KF20 0AB0 Siemens SM 431 6ES7431-1KF20-0AB0 S7-400 8AI 14-bit Module SM431 U/I/Resistance Input 6ES7431-1KF2O-0AB0 6ES743I-1KF20-0AB0
Technical notes
Signal type and resistance wiring for Siemens 6ES7431-1KF20-0AB0 are selected per channel group. The 24 V load supply is needed only for two-wire transmitters.
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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 a two-wire transmitter on 6ES7431-1KF20-0AB0 read zero?
Verify the external 24 V DC load supply, current wiring and selected range on 6ES7431-1KF20-0AB0. The backplane supply alone does not power the two-wire transmitter circuit.
How many resistance sensors can Siemens 6ES7431-1KF20-0AB0 measure?
Siemens 6ES7431-1KF20-0AB0 provides four resistance measurement paths, although it has eight voltage or current analog inputs.
Which resistance connection reduces lead error on 6ES7431-1KF20-0AB0?
Use the documented three- or four-wire circuit for 6ES7431-1KF20-0AB0 when the sensor and application require lead-resistance compensation.
Why can a valid field signal still appear incorrectly scaled on 6ES7431-1KF20-0AB0?
The measuring mode and range configured for 6ES7431-1KF20-0AB0 must match the wired voltage, current or resistance circuit. A range mismatch changes the digital interpretation.
Does 6ES7431-1KF20-0AB0 provide onboard diagnostic alarms?
No. The exact datasheet lists no diagnostics function for 6ES7431-1KF20-0AB0, so field-signal checks must use the measured value, wiring and controller logic.
What limits the cable run for 6ES7431-1KF20-0AB0?
Siemens specifies shielded analog wiring up to 200 m for 6ES7431-1KF20-0AB0; routing and grounding still determine how much external interference reaches the input.