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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power provides 6ES7431-7KF00-0AB0 quotations, manuals, product selection, and exact-model matching.

        6ES7431-7KF00-0AB0

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        Eight field voltage, current or thermocouple signals are converted for an S7-400 controller by Siemens 6ES7431-7KF00-0AB0, an isolated SM 431 analog input module.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
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        Technical specifications for 6ES7431-7KF00-0AB0

        • Manufacturer:
          Siemens
        • Part Number:
          6ES7431-7KF00-0AB0
        • Product Family:
          Siemens Simatic S7-400
        • Product Type:
          SIMATIC S7-400 SM 431 8-Channel Analog Input Module
        • Stock:
          1
        • Analog Input Channels:
          8
        • Supported Measurements:
          Voltage, current and thermocouple
        • Maximum Resolution:
          16 bit including sign
        • Basic Conversion Time:
          10, 16.7, 20 or 100 ms per channel
        • Integration Time:
          2.5, 16.7, 20 or 100 ms
        • Interference Suppression:
          400, 60, 50 or 10 Hz
        • Thermocouple Types:
          B, E, J, K, L, N, R, S, T and U
        • Current Ranges:
          0–20, 4–20, ±3.2, ±5, ±10 and ±20 mA
        • Voltage Ranges:
          1–5 V, ±1 V, ±2.5 V, ±5 V, ±10 V and millivolt ranges
        • Temperature Compensation:
          Internal, external socket or dynamic reference value
        • Shielded Cable Length:
          200 m maximum
        • Voltage Basic Error at 25 °C:
          ±0.1% of input range
        • Current Basic Error at 25 °C:
          ±0.17% of input range
        • Diagnostic Functions:
          Parameterizable diagnostic, limit-value and hardware alarms
        • Channel Isolation:
          Between channels and between channels and backplane bus
        • Isolation Test Voltage:
          1500 V DC
        • Backplane Current at 5 V DC:
          1200 mA maximum
        • Typical Power Loss:
          4.6 W
        • Weight:
          1.433 lbs (0.65 kg)
        • Estimated shipping dimensions:
          2.5x29x21cm
        • 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 Input Ranges Temperature Path Conversion Timing Alarms and Isolation

        Features:

        • Eight isolated analog channels accept voltage, current or thermocouple signals.
        • Selectable integration relates conversion time to interference-frequency suppression.
        • Diagnostic, hardware and limit-value alarms report configured channel conditions.
        The SM 431 converts field measurements into signed S7-400 process values instead of passing raw sensor levels to the CPU.

        Thermocouple channels combine characteristic linearization with an internal, external or dynamic reference-temperature path.

        Channel-to-channel and backplane isolation separate the measurement points from the rack communication circuit.

        The Siemens 6ES7431-7KF00-0AB0 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 6ES7431-7KF00-0AB0 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 a measuring method to each channel

        • Voltage paths: Each selected voltage range defines the electrical span converted into the channel word.
        • Current paths: Current transmitters use the configured bipolar, 0–20 mA or 4–20 mA range.
        • Thermocouple paths: Supported thermocouple types are linearized after their measured voltage is acquired.
        • Range protection: The documented destruction limits apply to the physical input before software scaling.

        Turning thermocouple voltage into temperature data

        • Cold junction: The reference temperature can come from the internal sensor, an external compensation socket or a dynamic value.
        • Linearization: The selected thermocouple curve converts the compensated millivolt signal into a temperature result.
        • Channel assignment: Thermocouple type and compensation method are configured for the channel that receives the sensor.
        • Wiring reach: Shielded field cable remains within the documented maximum path length.

        Balancing channel update and mains rejection

        • Integration setting: The configured integration interval sets the corresponding interference-suppression frequency.
        • Update interval: A shorter basic conversion time refreshes a channel sooner than the longer rejection settings.
        • Resolution: The converted channel value uses as many as sixteen bits including its sign.
        • Engineering choice: Timing is selected from the required update rate and the dominant interference frequency.

        Separating measurement status from rack communication

        • Diagnostic alarm: A parameterized module or input condition can request a diagnostic interrupt.
        • Limit alarm: Configured upper or lower boundaries can produce a limit-value event.
        • Hardware interrupt: The controller receives the enabled process event through the backplane.
        • Electrical separation: Channels are isolated from each other and from the S7-400 bus circuit.
        Description
        Siemens 6ES7431-7KF00-0AB0 is the SIMATIC S7-400 SM 431 analog input module that acquires eight voltage, current or thermocouple signals for the controller. Its input circuitry converts each field value into a signed digital word while keeping the channels isolated from one another and from the rack backplane.

        Range selection on 6ES7431-7KF00-0AB0 determines how an incoming electrical level is interpreted before conversion. Voltage and current transmitters use their assigned input ranges, whereas thermocouples pass through characteristic linearization and the selected cold-junction compensation path before the CPU receives a temperature value.

        For noise rejection, the integration setting of 6ES7431-7KF00-0AB0 links the conversion interval to the interference frequency that must be suppressed. A faster channel update uses the shorter conversion choice, while longer integration is available when 50 or 60 Hz rejection governs the measurement path.

        Diagnostic and limit-value events from 6ES7431-7KF00-0AB0 are transferred through the S7-400 backplane as parameterized alarms. These messages let the program distinguish an out-of-range or module condition from the ordinary analog value without combining that status with the field measurement itself.
        Alternative Names
        6ES74317KF000AB0 6ES7 431-7KF00-0AB0 6ES7431 7KF00 0AB0 Siemens 6ES7431-7KF00-0AB0 SM 431 6ES7431-7KF00-0AB0 S7-400 8AI 6ES7431-7KF00-0AB0 6ES7431-7KFOO-0AB0 6ES743I-7KF00-0AB0
        Technical notes
        Siemens 6ES7431-7KF00-0AB0 accepts eight voltage, current or thermocouple channels and applies a separately selected measuring range to each point. Cold-junction compensation must match the installed thermocouple wiring.
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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.
        VIEW ALL FAQS
        Which sensor types can be wired directly to 6ES7431-7KF00-0AB0?
        Use the 6ES7431-7KF00-0AB0 with a configured voltage, current or supported thermocouple signal and the matching input range.
        How should mains interference be reduced on 6ES7431-7KF00-0AB0?
        Select the 6ES7431-7KF00-0AB0 integration time that corresponds to the documented 50 Hz or 60 Hz suppression setting and use shielded wiring.
        Why can a thermocouple value from 6ES7431-7KF00-0AB0 be offset?
        Check that the thermocouple type and cold-junction method configured for 6ES7431-7KF00-0AB0 match the actual sensor and compensation wiring.
        Does one faulty input remove isolation from the other 6ES7431-7KF00-0AB0 channels?
        No. The analog inputs of 6ES7431-7KF00-0AB0 are isolated from one another and from the backplane bus.
        What should be reviewed when 6ES7431-7KF00-0AB0 reports a limit alarm?
        Compare the 6ES7431-7KF00-0AB0 channel value with its configured upper and lower limits before checking whether the event is a diagnostic alarm.
        Can a four-wire current transmitter connect to 6ES7431-7KF00-0AB0?
        Yes. A 6ES7431-7KF00-0AB0 current channel supports the documented four-wire transducer connection when its measuring range is configured correctly.

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