Programmable Logic Controller Guide: Selection, Application, and Maintenance for Engineers
PLC selection guide for engineers covering IEC 61131 compliance, Siemens, Rockwell, Schneider, ABB comparison, scan time sizing, and wiring. Shop at Stoklink.
- Part number
- 6ES7231-5QD50-0XB0
- Model no
- SB 1231, AI 4x 16-bit TC
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· From Türkiye
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SIMATIC S7-1200Siemens 6ES7231-5QD50-0XB0 SIMATIC S7-1200 SB 1231 TC AI 4x Thermocouple 16-bit Signal Board PLC I/O Module
S7-1200 SB 1231 TC signal board: 4 thermocouple inputs, J/K/T/E/R/S/B/N types, 15-bit + sign.
Description
About the SB 1231, AI 4x 16-bit TC
About the SB 1231, AI 4x 16-bit TC
The Siemens 6ES7231-5QD50-0XB0 is a SIMATIC S7-1200 SB 1231 TC signal board with 4 thermocouple analog inputs supporting types J, K, T, E, R, S, B, N and TXK/XK(L), plus a +/-80mV voltage range, at 15-bit plus sign resolution. It mounts directly onto the CPU faceplate and draws 20 mA typical from the 5V backplane bus.
Certifications & Standards
- CE
- UL
- cULus
- RCM
- KC
Selection Notes
The 8 supported thermocouple types (J, K, T, E, R, S, B, N) plus the raw +/-80mV voltage range let one signal board serve almost any thermocouple type a process specifies, with the type set per channel in software rather than by hardware selection. Cold-junction compensation accuracy of +/-1.5 degC sets the practical measurement floor - for tighter accuracy an external reference junction or RTD-based module is the better fit. As a Signal Board it consumes no extra CPU slot, mounting directly on the S7-1200 CPU faceplate, which matters when I/O real estate on a compact machine panel is already tight.
Applications
Direct temperature measurement on compact S7-1200 machines - oven, extruder, or drying-process temperature loops where adding a full analog input module isn't justified for just 4 channels.
Specification
Full specification
General information 1
| Product type designation | SB 1231, AI 4x 16-bit TC |
|---|
Input current 1
| from backplane bus 5 V DC, typ. | 20 mA |
|---|
Power loss 1
| Power loss, typ. | 0.1 W |
|---|
Show all 95 specifications ↓ Show less ↑92 more values in Identification, Analog inputs, Analog value generation for the inputs, Errors/accuracies, Interrupts/diagnostics/status information, 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 | 6ES7231-5QD50-0XB0 |
|---|---|
| Type designation | SB 1231, AI 4x 16-bit TC |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4034106036331 |
| ETIM class | EC001420 |
| eCl@ss | 27242201 |
Analog inputs 22
| Number of analog inputs | 4; 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 6
| Alarms | Yes |
|---|---|
| Diagnostics function | Yes; Can be read out |
| Alarms: Diagnostic alarm | Yes |
| Diagnoses: Wire break | Yes |
| Diagnostics indication LED: DIAG LED | Yes |
| Diagnostics indication LED: for status of the inputs | 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 | 15 mm |
|---|---|
| Height | 62 mm |
| Depth | 63 mm |
Weights 1
| Weight, approx. | 29 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 | 0.043 kg |
|---|---|
| Package dimensions | 82 × 34 × 79 mm |
| Country of origin | DE |
| Shipping weight | 0.543 kg |
| Ships from | Türkiye |
| Dispatch | 13 Nov |
| Stock | In stock |
Source: manufacturer data · Last verified: 01 Nov 2026
Documents
Documents for 6ES7231-5QD50-0XB0
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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 SB 1231, AI 4x 16-bit TC
What is the HS code of SB 1231, AI 4x 16-bit TC for customs?
The tariff (HS) code on file for SB 1231, AI 4x 16-bit TC is 85389091.
What is the EAN of SB 1231, AI 4x 16-bit TC?
The EAN (GTIN) of SB 1231, AI 4x 16-bit TC is 4034106036331.
Where does SB 1231, AI 4x 16-bit TC ship from, and how fast?
SB 1231, AI 4x 16-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
