Product Description
Key Features
- Exact product identity: Product type designation: SM 1231, AI 8×16 bit RTD.
- 8 RTD analog inputs: Number of analog inputs: 8; resistance thermometer input is supported.
- RTD and resistance ranges: Supports Pt10, Pt50, Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni200, Ni500, Ni1000, Cu10, Cu50, Cu100, LG-Ni1000, plus 150 Ω, 300 Ω and 600 Ω resistance.
- Electrical data: Rated supply voltage: 24 V DC. Typical current consumption: 40 mA; typical backplane bus consumption: 80 mA at 5 V DC.
- Measurement and diagnostics: Integrating measurement principle, 15 bit maximum resolution with overrange and + sign, alarms, readable diagnostics, supply-voltage monitoring, and wire-break detection.
- Protection: IP degree of protection: IP20.
Technical Summary
| Product type designation | SM 1231, AI 8×16 bit RTD |
|---|---|
| Rated supply voltage (DC) | 24 V |
| Number of analog inputs | 8; Resistance thermometer |
| Input ranges | Resistance thermometer: Pt10, Pt50, Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni200, Ni500, Ni1000, Cu10, Cu50, Cu100, LG-Ni1000; resistance: 150 Ω, 300 Ω, 600 Ω |
| Measurement principle | integrating |
| Resolution with overrange (bit including sign), max. | 15 bit; + sign |
| Interference voltage suppression | 85 dB at 50 / 60 / 400 Hz |
| Temperature error | 25 °C ±0.1%, to 55 °C ±0.2% total measurement range |
| Diagnostic functions | Alarms; diagnostics can be read out; supply-voltage monitoring; wire-break detection |
| Typical power data | 40 mA current consumption; 80 mA from backplane bus 5 V DC; 1.5 W power loss |
| IP degree of protection | IP20 |
Frequently Asked Questions
What exact Siemens order number should be verified?
Verify 6ES7231-5PF32-0XB0 and the product type designation SM 1231, AI 8×16 bit RTD.
How many RTD inputs does the module have?
It has 8 analog inputs for resistance thermometers.
What supply voltage does it require?
The rated supply voltage is 24 V DC.
Which RTD types and resistance ranges are supported?
It supports Pt10, Pt50, Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni200, Ni500, Ni1000, Cu10, Cu50, Cu100, LG-Ni1000, and resistance ranges of 150 Ω, 300 Ω and 600 Ω.
Does the module include diagnostic functions?
Yes. It has alarms, readable diagnostics, supply-voltage monitoring, wire-break detection, and input-status and maintenance LEDs.
