Key Features
- 4 RTD analog inputs: SM 1231, AI 4×16 bit RTD module with 4 analog inputs for resistance thermometer signals.
- Conformal coating: SIPLUS version with conformal coating for high-reliability protection.
- Railway application data: EN 50155 compliance stated with temperature class OT1, ST1/ST2 and horizontal mounting position.
- Diagnostics functions: Alarms, diagnostic alarm, monitoring of the supply voltage, wire break detection, and diagnostics that can be read out.
- Operating temperature range: -25 °C to 60 °C for horizontal installation, with +70 °C for 10 minutes under OT1, ST1/ST2.
Applications
- RTD temperature input acquisition: Acquires signals from 4 resistance thermometer inputs for temperature measurement.
- Input diagnostics for analog channels: Supports diagnostics, alarms, supply voltage monitoring, and wire break detection for the module inputs.
Technical Summary
| Product type designation | SM 1231, AI 4×16 bit RTD |
|---|---|
| based on | 6ES7231-5PD32-0XB0 |
| Rated value (DC) | 24 V |
| Current consumption, typ. | 40 mA |
| from backplane bus 5 V DC, typ. | 80 mA |
| Power loss, typ. | 1.5 W |
| Number of analog inputs | 4; Resistance thermometer |
| Input voltage, max. | ±35 V |
| Technical unit for temperature measurement adjustable | Degrees Celsius/degrees Fahrenheit |
| Resistance thermometer input support | Yes; Resistance-type transmitter: Pt10, Pt50, Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni200, Ni500, Ni1000, Cu10, Cu50, Cu100, LG-Ni1000 |
| Resistance input support | Yes; 150 Ω, 300 Ω, 600 Ω |
| Resolution with overrange, max. | 15 bit; + sign |
| Temperature error | 25 °C ±0.1%, to 55 °C ±0.2% total measurement range |
| Repeat accuracy at 25 °C | 0.05 % |
| Common mode interference, min. | 120 dB |
| IP degree of protection | IP20 |
| Isolation tested with | 750 V DC (type test) and according to EN 50155 (routine test) |
| Ambient temperature during operation, horizontal installation | -25 °C; = Tmin (incl. condensation/frost) |
| Ambient temperature during operation, horizontal installation, max. | 60 °C; = Tmax; +70 °C for 10 min (OT1, ST1/ST2 acc. to EN 50155) |
| Required front connector | Yes |
Frequently Asked Questions
What is Siemens 6AG2231-5PD32-1XB0?
It is a SIPLUS S7-1200 SM 1231 RTD analog input module, product type designation SM 1231, AI 4×16 bit RTD.
How many analog inputs does 6AG2231-5PD32-1XB0 have?
It has 4 analog inputs for resistance thermometer signals.
What power supply and current values are listed for this module?
Rated value (DC): 24 V, current consumption typ.: 40 mA, and from backplane bus 5 V DC typ.: 80 mA.
What diagnostics does the module support?
It supports alarms, diagnostic alarm, monitoring the supply voltage, wire break detection, and a diagnostics function that can be read out.
What installation and size details are listed for 6AG2231-5PD32-1XB0?
A required front connector is specified. The module measures 45 mm wide, 100 mm high, and 75 mm deep, with an approximate weight of 220 g.
