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
- 6ES7231-4HF50-0XB0
- Model no
- SM 1231, AI 8x 14 bit
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· From Türkiye
0
- CE
- UL
SIMATIC S7-1200Siemens 6ES7231-4HF50-0XB0 SIMATIC S7-1200 SM 1231 8AI 14-Bit Analog Input Module
SIMATIC S7-1200 SM 1231 analog input module: 8 AI, 14-bit, +/-10V or 4-20mA, IP20.
Description
About the SM 1231, AI 8x 14 bit
About the SM 1231, AI 8x 14 bit
The Siemens 6ES7231-4HF50-0XB0 is a SIMATIC S7-1200 SM 1231 analog input module with 8 channels of 14-bit differential voltage or current inputs (plus/minus 10 V, 5 V, 2.5 V, or 0/4-20 mA). It plugs onto the S7-1200 backplane bus and converts all 8 channels in a maximum cycle time of 1.25 ms. Input resistance is at least 1 MOhm on the voltage ranges.
Certifications & Standards
- CE
- UL
- cULus
- RCM
- KC
Selection Notes
This SM 1231 variant offers 8 configurable channels, useful when a single module needs to cover mixed voltage and current transducers on one backplane slot. Each channel independently selects between +/-10 V, +/-5 V, +/-2.5 V, or 4-20 mA/0-20 mA, so sensor types can be mixed without adding a second module. The 1.25 ms full-scan cycle time across all 8 channels, with 400 Hz noise rejection, keeps this module fast enough for process loops that poll analog values every control cycle.
Applications
Typical uses include reading 4-20 mA process transmitters for pressure, level, and flow, plus/minus 10 V analog sensors, and mixed sensor types on machine and process skids controlled by an S7-1200 CPU.
Specification
Full specification
General information 1
| Product type designation | SM 1231, AI 8x 14 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. | 45 mA |
|---|---|
| from backplane bus 5 V DC, typ. | 75 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, Degree and class of protection, Standards, approvals, certificates, Ambient conditions, Connection method, Mechanics/material, Dimensions, Weights, Logistics.
Identification 10
| Part number | 6ES7231-4HF50-0XB0 |
|---|---|
| Type designation | SM 1231, AI 8x 14 bit |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4034106035891 |
| ETIM class | EC001420 |
| eCl@ss | 27242201 |
Power loss 1
| Power loss, typ. | 2.5 W |
|---|
Analog inputs 20
| Number of analog inputs | 8; Current or voltage differential inputs |
|---|---|
| permissible input voltage for voltage input (destruction limit), max. | 35 V |
| permissible input current for current input (destruction limit), max. | 40 mA |
| Cycle time (all channels) max. | 1.25 ms; at 400 Hz rejection |
| Input ranges: Voltage | Yes; ±10V, ±5V, ±2.5V |
| Input ranges: Current | Yes; 4 to 20 mA, 0 to 20 mA |
| Input ranges: Thermocouple | No |
| Input ranges: Resistance thermometer | No |
| Input ranges: Resistance | No |
| Input ranges (rated values), voltages: -10 V to +10 V | Yes |
| Input ranges (rated values), voltages: Input resistance (-10 V to +10 V) | ≥1 MOhm |
| Input ranges (rated values), voltages: -2.5 V to +2.5 V | Yes |
| Input ranges (rated values), voltages: Input resistance (-2.5 V to +2.5 V) | ≥1 MOhm |
| Input ranges (rated values), voltages: -5 V to +5 V | Yes |
| Input ranges (rated values), voltages: Input resistance (-5 V to +5 V) | ≥1 MOhm |
| Input ranges (rated values), currents: 0 to 20 mA | Yes |
| Input ranges (rated values), currents: Input resistance (0 to 20 mA) | 270 Ω |
| Input ranges (rated values), currents: 4 mA to 20 mA | Yes |
| Input ranges (rated values), currents: Input resistance (4 mA to 20 mA) | 270 Ω |
| Cable length: shielded, max. | 100 m; shielded, twisted pair |
Analog value generation for the inputs 9
| Measurement principle | successive approximation |
|---|---|
| Integration and conversion time/resolution per channel: Resolution with overrange (bit including sign), max. | 13 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 | 40 dB, DC to 60 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
| Temperature error (relative to input range), (+/-) | 25 °C ±0.1 % / -20 °C to 60 °C ±0.2 % of the full-scale deflection |
|---|---|
| Basic error limit (operational limit at 25 °C): Voltage, relative to input range, (+/-) | 0.1 % |
| Basic error limit (operational limit at 25 °C): Current, relative to input range, (+/-) | 0.1 % |
| Interference voltage suppression for f = n x (f1 +/- 1 %), f1 = interference frequency: Common mode voltage, max. | 12 V |
Interrupts/diagnostics/status information 6
| Diagnostics function | Yes |
|---|---|
| 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 |
Degree and class of protection 1
| IP degree of protection | IP20 |
|---|
Standards, approvals, certificates 14
| Siemens Eco Profile (SEP) | Siemens EcoTech |
|---|---|
| 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 |
| Ecological footprint: environmental product declaration Global warming potential | Yes; type 2 acc. to ISO 14021 |
| Ecological footprint: global warming potential, (total) [CO2 eq] | 32.2 kg |
| Ecological footprint: global warming potential, (during production) [CO2 eq] | 7.96 kg |
| Ecological footprint: global warming potential, (during operation) [CO2 eq] | 24.5 kg |
| Ecological footprint: global warming potential, (after end of life cycle) [CO2 eq] | -0.358 kg |
Ambient conditions 17
| 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. | 40 °C; at max. voltages and max. specifications |
| 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 at 25 ℃ without condensation, max. | 95 % |
| 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: strength of the shock 15 g (peak value), duration 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 | No |
|---|
Mechanics/material 1
| Enclosure material (front): Plastic | Yes |
|---|
Dimensions 3
| Width | 30 mm |
|---|---|
| Height | 125 mm |
| Depth | 100 mm |
Weights 1
| Weight, approx. | 175 g |
|---|
Logistics 7
| Net weight | 0.175 kg |
|---|---|
| Package dimensions | 150 × 47 × 110 mm |
| Country of origin | CN |
| Shipping weight | 0.675 kg |
| Ships from | Türkiye |
| Dispatch | 12 Nov |
| Stock | In stock |
Source: manufacturer data · Last verified: 01 Nov 2026
Documents
Documents for 6ES7231-4HF50-0XB0
No documents are on file for this part yet.
Ask us for the datasheet
Certifications
Certifications and standards
- CE
- UL
- CE mark
- UL approval
- cULus
- RCM (formerly C-TICK)
- KC approval
Quick answers
Questions about the SM 1231, AI 8x 14 bit
Which supply voltage is SM 1231, AI 8x 14 bit rated for?
The rated operational voltage of SM 1231, AI 8x 14 bit is 24 V AC.
What is the HS code of SM 1231, AI 8x 14 bit for customs?
The tariff (HS) code on file for SM 1231, AI 8x 14 bit is 85389091.
What is the EAN of SM 1231, AI 8x 14 bit?
The EAN (GTIN) of SM 1231, AI 8x 14 bit is 4034106035891.
Where does SM 1231, AI 8x 14 bit ship from, and how fast?
SM 1231, AI 8x 14 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
