Programmable Logic Controller Guide: Selection, Application, and Maintenance for Engineers
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- Part number
- 6ES7231-5QF50-0XB0
- Model no
- SM 1231, AI 8x16 bit TC
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· From Türkiye
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SIMATIC S7-1200Siemens 6ES7231-5QF50-0XB0 SIMATIC S7-1200 SM 1231 TC 8x Thermocouple 15-Bit PLC I/O Module
SIMATIC S7-1200 SM 1231 TC, 8x thermocouple analog input module, types J/K/T/E/R/S/B/N/C, 15-bit resolution.
Description
About the SM 1231, AI 8x16 bit TC
About the SM 1231, AI 8x16 bit TC
Siemens 6ES7231-5QF50-0XB0 is a SIMATIC S7-1200 SM 1231 TC analog input module with 8 thermocouple channels supporting types J, K, T, E, R, S, B, N, C, and TXK/XK(L), 15-bit-plus-sign resolution, and a 24 V DC backplane supply. It plugs directly into the S7-1200 rack for distributed multi-point temperature measurement.
Certifications & Standards
- CE
- UL
- cULus
- RCM
- KC
Selection Notes
Eight independent thermocouple channels with 15-bit plus sign resolution suit multi-zone temperature monitoring where the installed sensors are already thermocouples rather than RTDs; the SM 1231 TC and RTD variants are not interchangeable, so sensor type on hand should drive the selection. A temperature error band of +/-0.1% across -20C to 60C and 120 dB common-mode rejection support noisy plant environments, though the 100 m shielded cable-length limit rules this module out for very long sensor runs without local signal conditioning.
Applications
Furnace and oven zone temperature monitoring, extruder barrel temperature loops, and multi-point process temperature logging on S7-1200-based automation stations.
Specification
Full specification
General information 1
| Product type designation | SM 1231, AI 8x16 bit TC |
|---|
Supply voltage 3
| Rated value (DC) | 24 V |
|---|---|
| permissible range, lower limit (DC) | 20.4 V |
| permissible range, upper limit (DC) | 28.8 V |
Input current 2
| Current consumption, typ. | 15 mA |
|---|---|
| from backplane bus 5 V DC, typ. | 40 mA |
Show all 101 specifications ↓ Show less ↑95 more values in Identification, Power loss, Analog inputs, Analog value generation for the inputs, Errors/accuracies, Interrupts/diagnostics/status information, Potential separation, Isolation, Degree and class of protection, Standards, approvals, certificates, Ambient conditions, Connection method, Mechanics/material, Dimensions, Weights, General Product Approval, Logistics.
Identification 10
| Part number | 6ES7231-5QF50-0XB0 |
|---|---|
| Type designation | SM 1231, AI 8x16 bit TC |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4034106036294 |
| ETIM class | EC001420 |
| eCl@ss | 27242201 |
Power loss 1
| Power loss, typ. | 0.6 W |
|---|
Analog inputs 22
| Number of analog inputs | 8; Thermocouples |
|---|---|
| permissible input voltage for voltage input (destruction limit), max. | ±35 V |
| Technical unit for temperature measurement adjustable | Degrees Celsius/degrees Fahrenheit |
| Input ranges: Voltage | Yes |
| Input ranges: Current | No |
| Input ranges: Thermocouple | Yes; J, K, T, E, R & S, B, N, C, TXK/XK(L); voltage range: ±80 mV |
| Input ranges: Resistance thermometer | No |
| Input ranges: Resistance | No |
| Input ranges (rated values), voltages: -80 mV to +80 mV | Yes |
| Input ranges (rated values), voltages: Input resistance (-80 mV to +80 mV) | >= 10 MOhm |
| Input ranges (rated values), thermocouples: Type B | Yes |
| Input ranges (rated values), thermocouples: Type C | Yes |
| Input ranges (rated values), thermocouples: Type E | Yes |
| Input ranges (rated values), thermocouples: Type J | Yes |
| Input ranges (rated values), thermocouples: Type K | Yes |
| Input ranges (rated values), thermocouples: Type N | Yes |
| Input ranges (rated values), thermocouples: Type R | Yes |
| Input ranges (rated values), thermocouples: Type S | Yes |
| Input ranges (rated values), thermocouples: Type T | Yes |
| Input ranges (rated values), thermocouples: Type TXK/TXK(L) to GOST | Yes |
| Thermocouple (TC) Temperature compensation: Parameterizable | Yes |
| Cable length: shielded, max. | 100 m; to the sensor |
Analog value generation for the inputs 9
| Measurement principle | integrating |
|---|---|
| Integration and conversion time/resolution per channel: Resolution with overrange (bit including sign), max. | 15 bit; + sign |
| Integration and conversion time/resolution per channel: Integration time, parameterizable | Yes |
| Integration and conversion time/resolution per channel: Interference voltage suppression for interference frequency f1 in Hz | 85 dB at 10 / 50 / 60 / 400 Hz |
| Smoothing of measured values: parameterizable | Yes |
| Smoothing of measured values: Step: None | Yes |
| Smoothing of measured values: Step: low | Yes |
| Smoothing of measured values: Step: Medium | Yes |
| Smoothing of measured values: Step: High | Yes |
Errors/accuracies 4
| cold connection point | ±1,5 °C |
|---|---|
| Temperature error (relative to input range), (+/-) | 25 °C ±0.05 % / -20 °C to 60 °C ±0.1 % of the full-scale range |
| Repeat accuracy in steady state at 25 °C (relative to input range), (+/-) | 0.05 % |
| Interference voltage suppression for f = n x (f1 +/- 1 %), f1 = interference frequency: Common mode interference, min. | 120 dB |
Interrupts/diagnostics/status information 7
| Alarms | Yes |
|---|---|
| Diagnostics function | Yes; Can be read out |
| Alarms: Diagnostic alarm | Yes |
| Diagnoses: Monitoring the supply voltage | Yes |
| Diagnoses: Wire break | Yes |
| Diagnostics indication LED: DIAG LED | Yes |
| Diagnostics indication LED: for status of the inputs | Yes |
Potential separation 1
| Potential separation analog inputs: between the channels and the power supply of the electronics | Yes |
|---|
Isolation 2
| Isolation tested with tested with | 707 V DC (type test) |
|---|---|
| Between channels | 120 V AC |
Degree and class of protection 1
| IP degree of protection | IP20 |
|---|
Standards, approvals, certificates 8
| CE mark | Yes |
|---|---|
| CSA approval | No |
| UL approval | Yes |
| cULus | Yes |
| FM approval | No |
| RCM (formerly C-TICK) | Yes |
| KC approval | Yes |
| Marine approval | No |
Ambient conditions 15
| Free fall: Fall height, max. | 0.3 m; five times, in product package |
|---|---|
| Ambient temperature during operation: horizontal installation, min. | -20 °C |
| Ambient temperature during operation: vertical installation, min. | -20 °C |
| Ambient temperature during storage/transportation: min. | -40 °C |
| Ambient temperature during storage/transportation: max. | 70 °C |
| Air pressure acc. to IEC 60068-2-13: Operation, min. | 540 hPa |
| Air pressure acc. to IEC 60068-2-13: Operation, max. | 1 140 hPa |
| Air pressure acc. to IEC 60068-2-13: Storage/transport, min. | 540 hPa |
| Air pressure acc. to IEC 60068-2-13: Storage/transport, max. | 1 140 hPa |
| Altitude during operation relating to sea level: Installation altitude, min. | -1 000 m |
| Relative humidity: Operation, max. | 95 %; no condensation |
| Vibrations: Vibration resistance during operation acc. to IEC 60068-2-6 | 3.5 mm from 5 - 8.4 Hz, 1g from 8.4 - 150 Hz |
| Vibrations: Operation, tested according to IEC 60068-2-6 | Yes |
| Shock testing: tested according to IEC 60068-2-27 | Yes; IEC 68, Part 2-27; half-sine, 15 g, 11 ms |
| Pollutant concentrations: SO2 at RH < 60% without condensation | S02: < 0.5 ppm; H2S: < 0.1 ppm; RH < 60 % condensation-free |
Connection method 1
| required front connector | Yes |
|---|
Mechanics/material 1
| Enclosure material (front): Plastic | Yes |
|---|
Dimensions 3
| Width | 30 mm |
|---|---|
| Height | 125 mm |
| Depth | 100 mm |
Weights 1
| Weight, approx. | 171 g |
|---|
General Product Approval 2
| Manufacturer Declara- Miscellaneous China RoHS tion | For use in hazard- |
|---|---|
| General Product Approval EMV Maritime application Manufacturer Declara-tion | ous locations |
Logistics 7
| Net weight | 0.171 kg |
|---|---|
| Package dimensions | 150 × 47 × 110 mm |
| Country of origin | CN |
| Shipping weight | 0.671 kg |
| Ships from | Türkiye |
| Dispatch | 12 Nov |
| Stock | In stock |
Source: manufacturer data · Last verified: 01 Nov 2026
Documents
Documents for 6ES7231-5QF50-0XB0
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Ask us for the datasheet
Certifications
Certifications and standards
- CE mark
- UL approval
- cULus
- RCM (formerly C-TICK)
- KC approval
Quick answers
Questions about the SM 1231, AI 8x16 bit TC
Which supply voltage is SM 1231, AI 8x16 bit TC rated for?
The rated operational voltage of SM 1231, AI 8x16 bit TC is 24 V AC.
What is the HS code of SM 1231, AI 8x16 bit TC for customs?
The tariff (HS) code on file for SM 1231, AI 8x16 bit TC is 85389091.
What is the EAN of SM 1231, AI 8x16 bit TC?
The EAN (GTIN) of SM 1231, AI 8x16 bit TC is 4034106036294.
Where does SM 1231, AI 8x16 bit TC ship from, and how fast?
SM 1231, AI 8x16 bit TC ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival. Stock items are dispatched within 1–2 business days.
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Series
Siemens SIMATIC S7-1200
- Brand
- Siemens
- Series
- SIMATIC S7-1200
