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
- 6ES7231-5PD32-0XB0
- Model no
- SM 1231, AI 4x16 bit RTD
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· From Türkiye
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SIMATIC S7-1200Siemens 6ES7231-5PD32-0XB0 SIMATIC S7-1200 SM 1231 RTD 4AI Analog Input Module
SIMATIC S7-1200 SM 1231 RTD module, 4 AI, Pt/Ni/Cu/LG-Ni sensor types, 15-bit resolution.
Description
About the SM 1231, AI 4x16 bit RTD
About the SM 1231, AI 4x16 bit RTD
The Siemens 6ES7231-5PD32-0XB0 is a SIMATIC S7-1200 SM 1231 RTD analog input module with 4 channels for resistance thermometers, supporting Pt, Ni, Cu, and LG-Ni sensor types across resistance ranges of 150, 300, or 600 Ω. Resolution reaches 15 bits plus sign, with a temperature error of ±0.1% of range at 25 °C.
Certifications & Standards
- CE mark
- CSA approval
- UL approval
- cULus
- FM approval
- RCM
- KC approval
- Marine approval
Selection Notes
Broad sensor-type support across Pt, Ni, Cu, and LG-Ni resistance thermometers means one module type can serve mixed sensor installations without stocking a separate RTD module per sensor family; the type is set per channel in software rather than by hardware jumper. The 15-bit-plus-sign resolution and 120 dB common-mode rejection at 50/60/400 Hz keep noise from AC power wiring out of the temperature reading, which matters when RTD leads run parallel to motor or drive cabling. Where thermocouple inputs are needed instead of resistance thermometers, a different SM 1231 variant in the same family is required — this module reads resistance-type sensors only.
Applications
Temperature monitoring for motor windings, bearing temperature, and process vessels using RTD sensors connected directly to an S7-1200 CPU without a separate signal conditioner.
Specification
Full specification
General information 1
| Product type designation | SM 1231, AI 4x16 bit RTD |
|---|
Supply voltage 1
| Rated value (DC) | 24 V |
|---|
Input current 2
| Current consumption, typ. | 40 mA |
|---|---|
| from backplane bus 5 V DC, typ. | 80 mA |
Show all 93 specifications ↓ Show less ↑89 more values in Identification, Power loss, Analog inputs, Analog value generation for the inputs, Errors/accuracies, Interrupts/diagnostics/status information, Degree and class of protection, Standards, approvals, certificates, Ambient conditions, Connection method, Mechanics/material, Dimensions, Weights, General Product Approval, Logistics.
Identification 10
| Part number | 6ES7231-5PD32-0XB0 |
|---|---|
| Type designation | SM 1231, AI 4x16 bit RTD |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 6940408101876 |
| ETIM class | EC001420 |
| eCl@ss | 27242201 |
Power loss 1
| Power loss, typ. | 1.5 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 |
| Thermocouple (TC) Temperature compensation: Parameterizable | No |
Analog value generation for the inputs 4
| 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 | No |
| Integration and conversion time/resolution per channel: Interference voltage suppression for interference frequency f1 in Hz | 85 dB at 50 / 60 / 400 Hz |
Errors/accuracies 3
| Temperature error (relative to input range), (+/-) | 25 °C ±0.1%, to 55 °C ±0.2% total measurement range |
|---|---|
| Repeat accuracy in steady state at 25 °C (relative to output 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: for status of the inputs | Yes |
| Diagnostics indication LED: for maintenance | Yes |
Degree and class of protection 1
| IP degree of protection | IP20 |
|---|
Standards, approvals, certificates 13
| CE mark | Yes |
|---|---|
| CSA approval | Yes |
| UL approval | Yes |
| cULus | Yes |
| FM approval | Yes |
| RCM (formerly C-TICK) | Yes |
| KC approval | Yes |
| Marine approval | Yes |
| Ecological footprint: environmental product declaration Global warming potential | Yes |
| Ecological footprint: global warming potential, (total) [CO2 eq] | 43.1 kg |
| Ecological footprint: global warming potential, (during production) [CO2 eq] | 7.62 kg |
| Ecological footprint: global warming potential, (during operation) [CO2 eq] | 36 kg |
| Ecological footprint: global warming potential, (after end of life cycle) [CO2 eq] | -0.544 kg |
Ambient conditions 13
| Free fall: Fall height, max. | 0.3 m; five times, in product package |
|---|---|
| Ambient temperature during operation: min. | -20 °C |
| Ambient temperature during operation: max. | 60 °C |
| 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. | 795 hPa |
| Air pressure acc. to IEC 60068-2-13: Operation, max. | 1 080 hPa |
| Air pressure acc. to IEC 60068-2-13: Storage/transport, min. | 660 hPa |
| Air pressure acc. to IEC 60068-2-13: Storage/transport, max. | 1 080 hPa |
| Relative humidity: Operation at 25 ℃ without condensation, max. | 95 % |
| 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 | 45 mm |
|---|---|
| Height | 100 mm |
| Depth | 75 mm |
Weights 1
| Weight, approx. | 220 g |
|---|
General Product Approval 1
| Miscellaneous Manufacturer Declara- Metrological Approval | tion |
|---|
Logistics 6
| Net weight | 0.191 kg |
|---|---|
| Country of origin | CN |
| Shipping weight | 0.691 kg |
| Ships from | Türkiye |
| Dispatch | 12 Nov |
| Stock | In stock |
Source: manufacturer data · Last verified: 01 Nov 2026
Documents
Documents for 6ES7231-5PD32-0XB0
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Ask us for the datasheet
Certifications
Certifications and standards
- CE mark
- CSA approval
- UL approval
- cULus
- FM approval
- RCM (formerly C-TICK)
- KC approval
- Marine approval
Quick answers
Questions about the SM 1231, AI 4x16 bit RTD
Which supply voltage is SM 1231, AI 4x16 bit RTD rated for?
The rated operational voltage of SM 1231, AI 4x16 bit RTD is 24 V AC.
What is the HS code of SM 1231, AI 4x16 bit RTD for customs?
The tariff (HS) code on file for SM 1231, AI 4x16 bit RTD is 85389091.
What is the EAN of SM 1231, AI 4x16 bit RTD?
The EAN (GTIN) of SM 1231, AI 4x16 bit RTD is 6940408101876.
Where does SM 1231, AI 4x16 bit RTD ship from, and how fast?
SM 1231, AI 4x16 bit RTD 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
