$ 393.30 $ 642.62Price range: $ 393.30 through $ 642.62
The SM 1231 thermocouple modules enable temperatures to be measured with high precision using established thermocouples. In addition, low level analog signals in the ±80 mV range can be recorded. The SM 1231 thermocouple modules can be used with the CPUs of the S7-1200 series.
| Article number | 6ES7231-5QD32-0XB0 | 6ES7231-5QF32-0XB0 |
| S7-1200, analog Input SM 1231 TC, 4 AI | S7-1200, analog Input SM 1231 TC, 8 AI | |
| General information | ||
| Product type designation | SM 1231, AI 4×16 bit TC | SM 1231, AI 8×16 bit TC |
| Supply voltage | ||
| Rated value (DC) | 24 V | 24 V |
| Input current | ||
| Current consumption, typ. | 40 mA | 40 mA |
| from backplane bus 5 V DC, typ. | 80 mA | 80 mA |
| Power loss | ||
| Power loss, typ. | 1.5 W | 1.5 W |
| Analog inputs | ||
| Number of analog inputs | 4; Thermocouples | 8; Thermocouples |
| permissible input voltage for voltage input (destruction limit), max. | ±35 V | ±35 V |
| Technical unit for temperature measurement adjustable | Degrees Celsius/degrees Fahrenheit | Degrees Celsius/degrees Fahrenheit |
| Input ranges | ||
| ● Voltage | Yes | Yes |
| ● Current | No | No |
| ● Thermocouple | Yes; J, K, T, E, R, S, N, C, TXK/XK(L); voltage range: ±80 mV | Yes; J, K, T, E, R & S, B, N, C, TXK/XK(L); voltage range: ±80 mV |
| ● Resistance thermometer | No | No |
| ● Resistance | No | No |
| Input ranges (rated values), voltages | ||
| ● -80 mV to +80 mV | Yes | Yes |
| — Input resistance (-80 mV to +80 mV) | ≥1 MOhm | ≥1 MOhm |
| Input ranges (rated values), thermocouples | ||
| ● Type B | Yes | Yes |
| ● Type C | Yes | Yes |
| ● Type E | Yes | Yes |
| ● Type J | Yes | Yes |
| ● Type K | Yes | Yes |
| ● Type N | Yes | Yes |
| ● Type R | Yes | Yes |
| ● Type S | Yes | Yes |
| ● Type T | Yes | Yes |
| ● Type TXK/TXK(L) to GOST | Yes | Yes |
| Thermocouple (TC) | ||
| Temperature compensation | ||
| — parameterizable | No | No |
| Analog value generation for the inputs | ||
| Measurement principle | integrating | integrating |
| Integration and conversion time/resolution per channel | ||
| ● Resolution with overrange (bit including sign), max. | 15 bit; + sign | 15 bit; + sign |
| ● Integration time, parameterizable | No | No |
| ● Interference voltage suppression for interference frequency f1 in Hz | 85 dB at 50 / 60 / 400 Hz | 85 dB at 50 / 60 / 400 Hz |
| Smoothing of measured values | ||
| ● parameterizable | Yes | Yes |
| Errors/accuracies | ||
| Temperature error (relative to input range), (+/-) | 25 °C ±0.1%, to 55 °C ±0.2% total measurement 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), (+/-) | 0.5 % | 0.5 % |
| Interference voltage suppression for f = n x (f1 +/- 1 %), f1 = interference frequency | ||
| ● Common mode interference, min. | 120 dB | 120 dB |
| Interrupts/diagnostics/status information | ||
| Alarms | Yes | Yes |
| Diagnostics function | Yes; Can be read out | Yes; Can be read out |
| Alarms | ||
| ● Diagnostic alarm | Yes | Yes |
| Diagnoses | ||
| ● Monitoring the supply voltage | Yes | Yes |
| ● Wire-break | Yes | Yes |
| Diagnostics indication LED | ||
| ● for status of the inputs | Yes | Yes |
| ● for maintenance | Yes | Yes |
| Degree and class of protection | ||
| IP degree of protection | IP20 | IP20 |
| Standards, approvals, certificates | ||
| CE mark | Yes | Yes |
| CSA approval | Yes | Yes |
| UL approval | Yes | Yes |
| cULus | Yes | Yes |
| FM approval | Yes | Yes |
| RCM (formerly C-TICK) | Yes | Yes |
| KC approval | Yes | Yes |
| Marine approval | Yes | Yes |
| Ambient conditions | ||
| Free fall | ||
| ● Fall height, max. | 0.3 m; five times, in product package | 0.3 m; five times, in product package |
| Ambient temperature during operation | ||
| ● min. | -20 °C | -20 °C |
| ● max. | 60 °C | 60 °C |
| ● horizontal installation, min. | -20 °C | -20 °C |
| ● horizontal installation, max. | 60 °C | 60 °C |
| ● vertical installation, min. | -20 °C | -20 °C |
| ● vertical installation, max. | 50 °C | 50 °C |
| Ambient temperature during storage/transportation | ||
| ● min. | -40 °C | -40 °C |
| ● max. | 70 °C | 70 °C |
| Air pressure acc. to IEC 60068-2-13 | ||
| ● Operation, min. | 795 hPa | 795 hPa |
| ● Operation, max. | 1 080 hPa | 1 080 hPa |
| ● Storage/transport, min. | 660 hPa | 660 hPa |
| ● Storage/transport, max. | 1 080 hPa | 1 080 hPa |
| Relative humidity | ||
| ● Operation at 25 ℃ without condensation, max. | 95 % | 95 % |
| Pollutant concentrations | ||
| ● SO2 at RH < 60% without condensation | S02: < 0.5 ppm; H2S: < 0.1 ppm; RH < 60% condensation-free | S02: < 0.5 ppm; H2S: < 0.1 ppm; RH < 60% condensation-free |
| connection method / header | ||
| required front connector | Yes | Yes |
| Mechanics/material | ||
| Enclosure material (front) | ||
| ● Plastic | Yes | Yes |
| Dimensions | ||
| Width | 45 mm | 45 mm |
| Height | 100 mm | 100 mm |
| Depth | 75 mm | 75 mm |
| Weights | ||
| Weight, approx. | 180 g | 220 g |
