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PRODUCT DESCRIPTION
6ES7231-5QD32-0XB0 acquires four thermocouple measurement channels
Siemens 6ES7231-5QD32-0XB0 is the SIMATIC S7-1200 SM 1231 AI 4 x 16 bit TC signal module. Its four channels can acquire supported thermocouple signals or low-level voltage inputs. Thermocouple values are reported in tenths of a degree, while voltage mode uses a different full-scale data representation.
Correct temperature acquisition depends on the selected sensor type, cold-junction compensation and the module thermal environment. Configure the noise-rejection setting and diagnostics for the actual process. This four-channel article must not be confused with the eight-channel SM 1231 TC variant.
Correct temperature acquisition depends on the selected sensor type, cold-junction compensation and the module thermal environment. Configure the noise-rejection setting and diagnostics for the actual process. This four-channel article must not be confused with the eight-channel SM 1231 TC variant.
BEFORE YOU BUY
Verify the complete measurement chain
ACTUAL APPLICATIONS
6ES7231-5QD32-0XB0 supports distinct temperature and millivolt tasks
Siemens documents independently selected thermocouple types, voltage measurement mode and external reference-junction arrangements. These scenarios require different configuration and commissioning checks.
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01 · MULTIPOINT TEMPERATURE
Read different thermocouple sensor types
Acquire up to four temperature points with the sensor type selected separately for each channel. Apply the matching thermocouple range, compensation method and temperature-unit conversion before using the readings in the process program. -
02 · MILLIVOLT ACQUISITION
Measure a low-level voltage signal
Configure voltage mode for a compatible signal within the documented millivolt range. Use its signed full-scale representation rather than temperature scaling, and verify the source, polarity and selected interference-rejection setting. -
03 · REFERENCE JUNCTION
Use a controlled external termination
For a controlled reference-junction arrangement, apply the documented 0 or 50 degree external isothermal terminal block. Match the compensation configuration to that installation and check thermal stability before assessing measurement error.
Technical specifications for 6ES7231-5QD32-0XB0
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Product Model6ES7231-5QD32-0XB0
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Product ParametersFour-Channel Thermocouple Input Module
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In stock1 unit
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ManufacturerSiemens
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Measurement channels4 thermocouple or voltage inputs
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Temperature resolution0.1 degree C or 0.1 degree F
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Voltage resolution15 bits plus sign
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Voltage measurement range-80 to +80 mV
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Temperature data representationMeasured degrees multiplied by 10
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Voltage nominal data range-27648 to +27648
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Input impedanceAt least 10 megaohms
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Maximum withstand voltagePlus or minus 35 V
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RepeatabilityPlus or minus 0.05% of full scale
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Noise rejection85 dB at the selected rejection frequency
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Cold-junction errorPlus or minus 1.5 degrees C; manual conditions apply
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Maximum sensor cable length100 m
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Maximum wire resistance100 ohms
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SM bus current consumption80 mA
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24 V current consumption40 mA; supply range 20.4 to 28.8 V DC
View all additional
Alternative Names
6ES7231-5QD32-0XB0
Siemens SM 1231 AI 4 x 16 bit TC
S7-1200 Four-Channel TC Module
SYSTEM & REPLACEMENT CHECK
Information needed before ordering
Three direct checks to secure your system integration and minimize ordering risks.
Information
System integration
Replacement check
Manuals & support
SM 1231 THERMOCOUPLE ACQUISITION
Configure the sensor curve and reference junction
The four-channel SM 1231 TC accepts supported thermocouple or low-level voltage measurements. Each channel needs the correct measurement type and scaling.
For thermocouples, cold-junction compensation depends on the terminal and module thermal conditions. Follow the warm-up and environmental restrictions before assessing accuracy.
Choose the rejection frequency with the required update time in mind, and implement wire-break, underflow, overflow and low-supply diagnostic handling in the application.
Features:
- Four independently configured measurement channels
- Cold-junction and filter configuration matter
- Treat diagnostic codes separately from process values
The Siemens 6ES7231-5QD32-0XB0 requires sensor curves, reference junctions and diagnostic handling to be checked during system integration and commissioning.
INTERCHANGEABILITY
Verify the complete replacement identity before commissioning
Identify 6ES7231-5QD32-0XB0 as the four-channel thermocouple article, not an RTD module or eight-channel TC article. Match the input type and project configuration before ordering.
Record the sensor type, temperature unit, compensation method, rejection frequency and diagnostic settings for every channel. Retain the sensor polarity and reference-junction wiring identification.
After replacement, allow the documented warm-up time and validate each channel using an appropriate known input. Test the required sensor-fault response before returning the readings to automatic control.
Features:
- Match four-channel thermocouple identity
- Retain each sensor and compensation setting
- Validate warm-up behavior and fault response
The Siemens 6ES7231-5QD32-0XB0 thermocouple module requires replacement verification of channel configuration, reference-junction wiring and measurement behavior before process release.
DOCUMENTATION STATUS
Browse the Manuals, Datasheets, Official Documents, Links
Important Notice: The extracts cover the four-channel SM 1231 TC article, its diagnostics and sensor-selection guidance. Related eight-channel columns remain identified in the original official tables; use the exact four-channel column.
Features:
- Available Siemens document references are confirmed before order
- Check sensor type, compensation and filter settings
- Accessories are supplied only when listed in the quotation
Documentation for the Siemens 6ES7231-5QD32-0XB0 must be read using the four-channel TC specifications; confirm manual availability in the written quotation.
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Important notice
Manuals, software, firmware, cables, calibration data and accessories are included only when listed in the quotation. AMIKON is an independent supplier and is not affiliated with or authorised by the manufacturer.
This content has been produced using multiple sources. Takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
BUYER INFORMATION
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Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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Shipping & delivery
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DispatchEligible stock: same / next day
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CarriersDHL, FedEx or UPS
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Ship fromXiamen, China
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Packed size8.80 × 10.90 × 5.70 cm
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Shipping weightApprox. 0.18 kg
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Payment & customs
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PaymentBank transfer (T/T)
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CurrenciesUSD · EUR · GBP · RMB
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Credit cardsNot accepted
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HS reference8538900000
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OriginChina
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Warranty & returns
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Warranty12 months from AMIKON
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InspectionLabel, condition and packing checks
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ReturnsPrior RMA authorisation required
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CompatibilityConfirm before order
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OEM warrantyDoes not apply
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Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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Part checked
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Sandy Lin
Dedicated account manager · 15+ years
FREQUENTLY ASKED QUESTIONS
Questions buyers ask about 6ES7231-5QD32-0XB0
Direct answers about identity, compatibility, stock, warranty, payment and shipping.
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Why does a temperature of 25.3 degrees appear in the PLC as 253?
Thermocouple mode reports temperature multiplied by ten. The value 253 therefore represents 25.3 degrees in the configured temperature unit. Do not apply the voltage-mode full-scale normalization to a thermocouple value. -
Can each of the four channels use a different thermocouple type?
Yes. Siemens permits a different thermocouple type to be configured for each channel. Check the supported type and its nominal range in the selection table; a common connector does not make different sensor curves interchangeable. -
Why does a temperature reading drift when a cabinet fan starts?
Air movement and rapid module-temperature changes can introduce cold-junction compensation errors. Siemens calls for a thermally stable environment and describes slow ambient variation below 0.1 degree C per minute. Review sensor terminals and cabinet airflow before treating the drift as a process change. -
How long should a new module warm up before checking cold-junction accuracy?
The manual requires at least 30 minutes of warm-up to meet the stated cold-junction specification. The internal cold-junction error is additional to the sensor-type table error, and the manual gives further restrictions for low ambient temperatures. -
What changes when the rejection setting is reduced from 50 Hz to 10 Hz?
For the four-channel module, the published update time changes from 0.263 seconds at 50 Hz rejection to 1.225 seconds at 10 Hz. Select the filter for both interference rejection and the response time required by the process. -
Can a broken thermocouple produce a plausible value if its alarm is disabled?
Yes. Siemens warns that an open sensor wire can produce random values when the wire-break alarm is disabled. Configure appropriate diagnostic handling and test the fault response rather than relying only on a plausible displayed temperature. -
Does wire-break detection add a regular delay to conversion?
The module tests for wire break every six seconds. The manual states that this extends the update time by 9 ms for each enabled channel once every six seconds. Include that behavior when evaluating measurement timing. -
Is an external reference junction available for a more controlled termination arrangement?
The manual supports external isothermal terminal blocks referenced to 0 or 50 degrees C. Configure the matching compensation method and follow the complete wiring guidance; do not combine an external reference arrangement with an unrelated internal-compensation setting.
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