| General information |
| Product type designation | SM 1231, AI 4x16 bit RTD |
| Supply voltage |
| Rated value (DC) | 24 V |
| Input current |
| Current consumption, typ. | 40 mA |
| from backplane bus 5 V DC, typ. | 80 mA |
| Power loss |
| Power loss, typ. | 1.5 W |
| Analog inputs |
| 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 |
| ● Current | No |
| ● Thermocouple | No |
| ● Resistance thermometer | Yes; Resistance-type transmitter: Pt10, Pt50, Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni200, Ni500, Ni1000, Cu10, Cu50, Cu100, LG-Ni1000 |
| ● Resistance | Yes; 150 Ω, 300 Ω, 600 Ω |
| Input ranges (rated values), resistance thermometer |
| ● Cu 10 | Yes |
| — Input resistance (Cu 10) | 10 Ω |
| ● Ni 100 | Yes |
| — Input resistance (Ni 100) | 100 Ω |
| ● Ni 1000 | Yes |
| — Input resistance (Ni 1000) | 1 000 Ω |
| ● LG-Ni 1000 | Yes |
| — Input resistance (LG-Ni 1000) | 1 000 Ω |
| ● Ni 120 | Yes |
| — Input resistance (Ni 120) | 120 Ω |
| ● Ni 200 | Yes |
| — Input resistance (Ni 200) | 200 Ω |
| ● Ni 500 | Yes |
| — Input resistance (Ni 500) | 500 Ω |
| ● Pt 100 | Yes |
| — Input resistance (Pt 100) | 100 Ω |
| ● Pt 1000 | Yes |
| — Input resistance (Pt 1000) | 1 000 Ω |
| ● Pt 200 | Yes |
| — Input resistance (Pt 200) | 200 Ω |
| ● Pt 500 | Yes |
| — Input resistance (Pt 500) | 500 Ω |
| Input ranges (rated values), resistors |
| ● 0 to 150 ohms | Yes |
| ● 0 to 300 ohms | Yes |
| ● 0 to 600 ohms | Yes |
| Thermocouple (TC) |
| Temperature compensation |
| — parameterizable | No |
| Analog value generation for the inputs |
| Measurement principle | integrating |
| Integration and conversion time/resolution per channel |
| ● Resolution with overrange (bit including sign), max. | 15 bit; + sign |
| ● Integration time, parameterizable | No |
| ● Interference voltage suppression for interference frequency f1 in Hz | 85 dB at 50 / 60 / 400 Hz |
| Errors/accuracies |
| 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 |
| Alarms | Yes |
| Diagnostics function | Yes; Can be read out |
| Alarms |
| ● Diagnostic alarm | Yes |
| Diagnoses |
| ● Monitoring the supply voltage | Yes |
| ● Wire-break | Yes |
| Diagnostics indication LED |
| ● for status of the inputs | Yes |
| ● for maintenance | Yes |
| Degree and class of protection |
| IP degree of protection | IP20 |
| Standards, approvals, certificates |
| 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 | Yes |
| Global warming potential |
| — global warming potential, (total) [CO2 eq] | 43.1 kg |
| — global warming potential, (during production) [CO2 eq] | 7.62 kg |
| — global warming potential, (during operation) [CO2 eq] | 36 kg |
| — global warming potential, (after end of life cycle) [CO2 eq] | -0.544 kg |
| Ambient conditions |
| Free fall |
| ● Fall height, max. | 0.3 m; five times, in product package |
| Ambient temperature during operation |
| ● min. | -20 °C |
| ● max. | 60 °C |
| ● horizontal installation, min. | -20 °C |
| ● horizontal installation, max. | 60 °C |
| ● vertical installation, min. | -20 °C |
| ● vertical installation, max. | 50 °C |
| Ambient temperature during storage/transportation |
| ● min. | -40 °C |
| ● max. | 70 °C |
| Air pressure acc. to IEC 60068-2-13 |
| ● Operation, min. | 795 hPa |
| ● Operation, max. | 1 080 hPa |
| ● Storage/transport, min. | 660 hPa |
| ● 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 |
| required front connector | Yes |
| Mechanics/material |
| Enclosure material (front) | |
| ● Plastic | Yes |
| Dimensions |
| Width | 45 mm |
| Height | 100 mm |
| Depth | 75 mm |
| Weights |
| Weight, approx. | 220 g |
| Approvals / Certificates |