6ES7231-4HF32-0XB0 is a high-performance analog input module SM 1231 designed for the SIMATIC S7-1200 PLC system. It provides 8 analog input channels supporting both voltage and current signals with flexible configuration. Featuring 13-bit resolution, fast conversion, and electrical isolation, it ensures stable and accurate data acquisition in industrial environments.
Figure 1 shows the front panel of 6ES7231-4HF32-0XB0.


Table 1 shows the Quick Specs
| Item | Details |
|---|---|
| Part Number | 6ES7231-4HF32-0XB0 |
| Product Line | SIMATIC S7-1200 |
| Type | Analog Input Module SM 1231 |
| Inputs | 8 AI |
| Signal Types | Voltage / Current |
| Resolution | 12-bit + sign (13-bit ADC) |
| Supply | 24 VDC |
| Protection | IP20 |
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model | 6ES7231-4HF32-0XB0 |
| Series | SIMATIC S7-1200 |
| Module Name | SM 1231 |
| Number of Analog Inputs | 8 |
| Input Signal Ranges | ±10 V, ±5 V, ±2.5 V, 0–20 mA, 4–20 mA |
| Resolution | 12-bit + sign (13-bit ADC) |
| Conversion Time | Max. 625 µs (all channels) |
| Power Supply | 24 VDC |
| Power Consumption | Typ. 1.5 W |
| Isolation Voltage | 500 VDC |
| Operating Temperature | -20 °C to +60 °C |
| Dimensions (W×H×D) | 45 mm × 100 mm × 75 mm |
| Weight | Approx. 0.19 kg |
| Protection Rating | IP20 |
| Certifications | CE, UL, cULus, CSA, FM, KC |

