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
- 6ES7231-5PD50-0XB0
- Model no
- SM 1231 RTD 4x 16 bit
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· From Türkiye
0
- CE
SIMATIC S7-1200Siemens 6ES7231-5PD50-0XB0 SIMATIC S7-1200 SM 1231 RTD AI 4x 16-Bit PLC I/O Module
SIMATIC S7-1200 SM 1231 RTD module - 4 analog RTD inputs, Pt100/Pt1000, 15-bit resolution, 100m cable.
Description
About the SM 1231 RTD 4x 16 bit
About the SM 1231 RTD 4x 16 bit
The Siemens 6ES7231-5PD50-0XB0 is a SIMATIC S7-1200 SM 1231 RTD signal module with 4 analog inputs for resistance thermometers, supporting Pt10 through Pt1000, Ni, Cu, and LG-Ni sensor types plus direct resistance measurement up to 600 ohms. Resolution is 15 bit plus sign, with 0.1 percent accuracy at 25 degrees C and a shielded cable length up to 100 m to the sensor.
Certifications & Standards
- CE
- UL
- cULus
- RCM
- KC
Selection Notes
The 4-channel RTD input and support for Pt10 through Pt1000, Ni, Cu, and LG-Ni sensor types let one module cover several probe standards without swapping hardware between projects using different temperature sensor brands. The 15-bit plus sign resolution with 0.1 percent accuracy at 25 degrees C suits closed-loop temperature control rather than simple threshold alarming. Because the integration time is parameterizable, a slower setting trades response speed for better noise rejection in electrically noisy cabinets, while a faster setting favors quick-changing process temperatures.
Applications
Temperature measurement in S7-1200-based machine and process control, including HVAC skids, extrusion and thermoforming lines, and any application using Pt100 or Pt1000 RTD probes for closed-loop temperature control.
Specification
Full specification
General information 1
| Product type designation | SM 1231 RTD 4x 16 bit |
|---|
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. | 65 mA |
Show all 100 specifications ↓ Show less ↑94 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, Logistics.
Identification 10
| Part number | 6ES7231-5PD50-0XB0 |
|---|---|
| Type designation | SM 1231 RTD 4x 16 bit |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4034106036201 |
| ETIM class | EC001420 |
| eCl@ss | 27242201 |
Power loss 1
| Power loss, typ. | 0.6 W |
|---|
Analog inputs 24
| Number of analog inputs | 4; Resistance thermometer |
|---|---|
| permissible input voltage for voltage input (destruction limit), max. | ±35 V |
| Technical unit for temperature measurement adjustable | Degrees Celsius/degrees Fahrenheit |
| Input ranges: Voltage | No |
| Input ranges: Current | No |
| Input ranges: Thermocouple | No |
| Input ranges: Resistance thermometer | Yes; Resistance-type transmitter: Pt10, Pt50, Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni200, Ni500, Ni1000, Cu10, Cu50, Cu100, LG-Ni1000 |
| Input ranges: Resistance | Yes; 150 Ω, 300 Ω, 600 Ω |
| Input ranges (rated values), resistance thermometer: Cu 10 | Yes |
| Input ranges (rated values), resistance thermometer: Input resistance (Cu 10) | 10 Ω |
| Input ranges (rated values), resistance thermometer: Ni 100 | Yes |
| Input ranges (rated values), resistance thermometer: Ni 1000 | Yes |
| Input ranges (rated values), resistance thermometer: LG-Ni 1000 | Yes |
| Input ranges (rated values), resistance thermometer: Ni 120 | Yes |
| Input ranges (rated values), resistance thermometer: Ni 200 | Yes |
| Input ranges (rated values), resistance thermometer: Ni 500 | Yes |
| Input ranges (rated values), resistance thermometer: Pt 100 | Yes |
| Input ranges (rated values), resistance thermometer: Pt 1000 | Yes |
| Input ranges (rated values), resistance thermometer: Pt 200 | Yes |
| Input ranges (rated values), resistance thermometer: Pt 500 | Yes |
| Input ranges (rated values), resistors: 0 to 150 ohms | Yes |
| Input ranges (rated values), resistors: 0 to 300 ohms | Yes |
| Input ranges (rated values), resistors: 0 to 600 ohms | 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 3
| Temperature error (relative to input range), (+/-) | 25 °C ±0.1 % / -20 °C to 60 °C ±0.2 % of the full-scale deflection |
|---|---|
| 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 | No |
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. | 169 g |
|---|
Logistics 7
| Net weight | 0.169 kg |
|---|---|
| Package dimensions | 150 × 47 × 110 mm |
| Country of origin | CN |
| Shipping weight | 0.669 kg |
| Ships from | Türkiye |
| Dispatch | 12 Nov |
| Stock | In stock |
Source: manufacturer data · Last verified: 01 Nov 2026
Documents
Documents for 6ES7231-5PD50-0XB0
No documents are on file for this part yet.
Ask us for the datasheet
Certifications
Certifications and standards
- CE
- CE mark
- UL approval
- cULus
- RCM (formerly C-TICK)
- KC approval
Quick answers
Questions about the SM 1231 RTD 4x 16 bit
Which supply voltage is SM 1231 RTD 4x 16 bit rated for?
The rated operational voltage of SM 1231 RTD 4x 16 bit is 24 V AC.
What is the HS code of SM 1231 RTD 4x 16 bit for customs?
The tariff (HS) code on file for SM 1231 RTD 4x 16 bit is 85389091.
What is the EAN of SM 1231 RTD 4x 16 bit?
The EAN (GTIN) of SM 1231 RTD 4x 16 bit is 4034106036201.
Where does SM 1231 RTD 4x 16 bit ship from, and how fast?
SM 1231 RTD 4x 16 bit 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
