6ES7431-7QH00-0AB0
6ES7431-7QH00-0AB0
6ES7431-7QH00-0AB0
6ES7431-7QH00-0AB0
6ES7431-7QH00-0AB0
6ES7431-7QH00-0AB0
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  • Lifecycle status

    Discontinued / Obsolete by OEM
    Apter Power supports sourcing the exact 6ES7431-7QH00-0AB0 for documented SIMATIC S7-400 maintenance requirements.

6ES7431-7QH00-0AB0

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Siemens 6ES7431-7QH00-0AB0 is a 16-bit SIMATIC S7-400 SM 431 analog input module with configurable diagnostics and alarms.
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Technical specifications for 6ES7431-7QH00-0AB0

  • Manufacturer:
    Siemens
  • Part Number:
    6ES7431-7QH00-0AB0
  • Product Family:
    Siemens Simatic S7-400
  • Product Type:
    Analog Input Module
  • Stock:
    1
  • Voltage/Current/TC Inputs:
    16
  • Resistance/RTD Positions:
    8 even-numbered channels
  • Resolution:
    16-bit
  • Signal Cable Length:
    Up to 200 m; 50 m for thermocouples and ≤80 mV ranges
  • Common-Mode Limit:
    120 V AC maximum
  • Two-Wire Transducer Supply:
    24 V DC, maximum 50 mA per channel
  • Backplane Current:
    Maximum 700 mA at 5 V
  • Typical Power Loss:
    4.5 W
  • Weight:
    0.851 kg
  • Estimated shipping dimensions:
    23.3 x 30.4 x 4.1 cm
  • 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 Channel Pairing Sensor Wiring Diagnostics Reference Junction

Features:

  • Accepts voltage, current, resistance, RTD and thermocouple measurement types.
  • Converts analog values at 16-bit resolution for the S7-400 CPU.
  • Provides configurable diagnostics, limit alarms and end-of-cycle interrupts.
Channel-pair organization determines which inputs remain available for each measurement method.

The analog section is separated from the CPU while sharing a common electrical reference across its channels.

External 24 V loading depends on whether 6ES7431-7QH00-0AB0 supplies two-wire current transducers.

The Siemens 6ES7431-7QH00-0AB0 Analog Input Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).

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

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.

Measurement-Position Assignment

  • Direct inputs: Voltage, current and thermocouple ranges can use all 16 channels.
  • Resistance inputs: RTD and resistance measurements are assigned to the eight even channels.
  • Adjacent channel: The following odd channel carries the sensor-current connection for each resistance circuit.
  • Configuration unit: Measuring-range modules and parameter settings are reviewed by channel pair.

Input-Cable Boundaries

  • General reach: Applicable shielded analog leads can extend to 200 m.
  • Low-level limit: Thermocouples and ranges up to 80 mV are limited to 50 m.
  • Two-wire supply: The L+ path provides up to 50 mA for each powered transducer input.
  • Isolation boundary: Channels share their analog reference although the analog section is isolated from the CPU.

Signal-Fault Reporting

  • Diagnostic interrupt: Configured channel faults can be transferred to the controller program.
  • Wire break: Monitoring is available for thermocouple, RTD and resistance circuits.
  • Current exception: Current-loop wire break applies only to four-wire 4–20 mA measurement.
  • Cycle reporting: End-of-cycle interrupts can synchronize processing with completed conversions.

Thermocouple Compensation Path

  • RTD position: A reference-junction sensor is connected through channel 0.
  • Reserved pair: Channels 0 and 1 are consumed by that compensation circuit.
  • Compensated group: The measured junction temperature serves thermocouples on channels 2–15.
  • Planning effect: Reference-junction use reduces the remaining direct measurement count by one pair.
Description
6ES7431-7QH00-0AB0 is the Siemens SIMATIC S7-400 SM 431 isolated analog input module for 16-bit acquisition of voltage, current, thermocouple, resistance and RTD signals.

6ES7431-7QH00-0AB0 organizes channels in pairs: voltage, current and thermocouple ranges can use 16 inputs, while resistance and RTD circuits use eight even-numbered measurement positions with the adjacent odd channel reserved for sensor-current routing.

6ES7431-7QH00-0AB0 supports configurable diagnostics, limit alarms and end-of-cycle interrupts. Cable length, reference-junction use and the 24 V supply for two-wire transmitters must be checked against the selected range and wiring plan before commissioning.
Alternative Names
6ES74317QH000AB0 6ES7431 7QH00 0AB0 6ES7 431-7QH00-0AB0 Siemens 6ES7431-7QH00-0AB0 SIMATIC S7-400 6ES7431-7QH00-0AB0 SM 431 6ES7431-7QH00-0AB0 6ES7431-7QH00-0AB0 Analog Input
Technical notes
The main risk with 6ES7431-7QH00-0AB0 is treating all 16 inputs as independently available for every sensor type. Resistance and RTD circuits consume channel pairs, reference-junction compensation reserves channels 0 and 1, and thermocouple or 80 mV and lower wiring is limited to 50 m. Verify the configured range, pair assignment and field wiring before energization.
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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 are only eight resistance sensors assigned to 6ES7431-7QH00-0AB0 although it has 16 inputs?
Each resistance or RTD circuit on 6ES7431-7QH00-0AB0 uses an even channel plus the adjacent odd channel for sensor-current routing, leaving eight measurement positions.
What is lost when channel 0 of 6ES7431-7QH00-0AB0 is used for reference-junction compensation?
The reference-junction RTD occupies channels 0 and 1 of 6ES7431-7QH00-0AB0, while its compensation value applies to thermocouples connected on channels 2–15.
Can a 150 m thermocouple cable be connected directly to 6ES7431-7QH00-0AB0?
No. Thermocouple wiring to 6ES7431-7QH00-0AB0 is limited to 50 m even though other shielded analog ranges can use cables up to 200 m.
When does 6ES7431-7QH00-0AB0 require the external 24 V load supply?
The 24 V path on 6ES7431-7QH00-0AB0 is required when the module supplies two-wire current transducers; other input arrangements do not use that load supply in the same way.
Which current range on 6ES7431-7QH00-0AB0 supports wire-break monitoring?
For current measurement, 6ES7431-7QH00-0AB0 provides wire-break monitoring only on the four-wire 4–20 mA range.
How should a technician separate CPU isolation from channel isolation on 6ES7431-7QH00-0AB0?
The analog circuitry of 6ES7431-7QH00-0AB0 is isolated from the CPU, but the individual input channels are not galvanically isolated from one another.