$ 279.91 $ 524.40Price range: $ 279.91 through $ 524.40
The SM 1231 analog input signal modules convert analog signals from the process into digital signals for internal processing by the SIMATIC S7-1200 controller.
| Article number | 6ES7231-4HD32-0XB0 | 6ES7231-4HF32-0XB0 | 6ES7231-5ND32-0XB0 |
| Analog Input SM 1231, 4AI | Analog Input SM 1231, 8AI | Analog Input SM 1231, 4AI 16bit | |
| General information | |||
| Product type designation | SM 1231, AI 4×13 bit | SM 1231, AI 8×13 bit | SM 1231, AI 4×16 bit |
| Supply voltage | |||
| Rated value (DC) | 24 V | 24 V | 24 V |
| Input current | |||
| Current consumption, typ. | 45 mA | 45 mA | 65 mA |
| from backplane bus 5 V DC, typ. | 80 mA | 90 mA | 80 mA |
| Power loss | |||
| Power loss, typ. | 1.5 W | 1.5 W | 1.8 W |
| Analog inputs | |||
| Number of analog inputs | 4; Current or voltage differential inputs | 8; Current or voltage differential inputs | 4; Current or voltage differential inputs |
| permissible input voltage for voltage input (destruction limit), max. | 35 V | 35 V | ±35 V |
| permissible input current for current input (destruction limit), max. | 40 mA | 40 mA | 40 mA |
| Cycle time (all channels) max. | 625 µs | 625 µs | 100 µs |
| Input ranges | |||
| ● Voltage | Yes; ±10V, ±5V, ±2.5V | Yes; ±10V, ±5V, ±2.5V | Yes; ±10V, ±5V, ±2.5V or ±1.25V |
| ● Current | Yes; 4 to 20 mA, 0 to 20 mA | Yes; 4 to 20 mA, 0 to 20 mA | Yes; 4 to 20 mA, 0 to 20 mA |
| ● Thermocouple | No | No | No |
| ● Resistance thermometer | No | No | No |
| ● Resistance | No | Yes | No |
| Input ranges (rated values), voltages | |||
| ● -1.25 V to +1.25 V | Yes | ||
| ● -10 V to +10 V | Yes | Yes | Yes |
| — Input resistance (-10 V to +10 V) | ≥9 MOhm | ≥9 MOhm | ≥1 MOhm |
| ● -2.5 V to +2.5 V | Yes | Yes | Yes |
| — Input resistance (-2.5 V to +2.5 V) | ≥9 MOhm | ≥9 MOhm | ≥1 MOhm |
| ● -5 V to +5 V | Yes | Yes | Yes |
| — Input resistance (-5 V to +5 V) | ≥9 MOhm | ≥9 MOhm | ≥1 MOhm |
| Input ranges (rated values), currents | |||
| ● 0 to 20 mA | Yes | Yes | Yes |
| — Input resistance (0 to 20 mA) | 280 Ω | 280 Ω | |
| ● 4 mA to 20 mA | Yes | Yes | Yes |
| — Input resistance (4 mA to 20 mA) | 280 Ω | 280 Ω | |
| Thermocouple (TC) | |||
| Temperature compensation | |||
| — parameterizable | No | ||
| Analog value generation for the inputs | |||
| Integration and conversion time/resolution per channel | |||
| ● Resolution with overrange (bit including sign), max. | 12 bit; + sign | 12 bit; + sign | 15 bit; + sign |
| ● Integration time, parameterizable | Yes | Yes | Yes |
| ● Interference voltage suppression for interference frequency f1 in Hz | 40 dB, DC to 60 V for interference frequency 50 / 60 Hz | 40 dB, DC to 60 V for interference frequency 50 / 60 Hz | 40 dB, DC to 60 V for interference frequency 50 / 60 Hz |
| Smoothing of measured values | |||
| ● parameterizable | Yes | Yes | Yes |
| ● Step: None | Yes | Yes | Yes |
| ● Step: low | Yes | Yes | Yes |
| ● Step: Medium | Yes | Yes | Yes |
| ● Step: High | Yes | 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 | 25 °C ±0.1% / ±0.3% total measurement range |
| Basic error limit (operational limit at 25 °C) | |||
| ● Voltage, relative to input range, (+/-) | 0.1 % | 0.1 % | 0.1 % |
| ● Current, relative to input range, (+/-) | 0.1 % | 0.1 % | 0.1 % |
| Interference voltage suppression for f = n x (f1 +/- 1 %), f1 = interference frequency | |||
| ● Common mode voltage, max. | 12 V | 12 V | 12 V |
| Interrupts/diagnostics/status information | |||
| Alarms | Yes | Yes | Yes |
| Diagnostics function | Yes | Yes | Yes |
| Alarms | |||
| ● Diagnostic alarm | Yes | Yes | Yes |
| Diagnoses | |||
| ● Monitoring the supply voltage | Yes | Yes | Yes |
| ● Wire-break | Yes | Yes | Yes |
| Diagnostics indication LED | |||
| ● for status of the inputs | Yes | Yes | Yes |
| ● for maintenance | Yes | Yes | Yes |
| Degree and class of protection | |||
| IP degree of protection | IP20 | IP20 | IP20 |
| Standards, approvals, certificates | |||
| CE mark | Yes | Yes | Yes |
| CSA approval | Yes | Yes | Yes |
| UL approval | Yes | Yes | Yes |
| cULus | Yes | Yes | Yes |
| FM approval | Yes | Yes | Yes |
| RCM (formerly C-TICK) | Yes | Yes | Yes |
| KC approval | Yes | Yes | Yes |
| Marine approval | Yes | 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 | 0.3 m; five times, in product package |
| Ambient temperature during operation | |||
| ● min. | -20 °C | -20 °C | -20 °C |
| ● max. | 60 °C | 60 °C | 60 °C |
| ● horizontal installation, min. | -20 °C | -20 °C | -20 °C |
| ● horizontal installation, max. | 60 °C | 60 °C | 60 °C |
| ● vertical installation, min. | -20 °C | -20 °C | -20 °C |
| ● vertical installation, max. | 50 °C | 50 °C | 50 °C |
| Ambient temperature during storage/transportation | |||
| ● min. | -40 °C | -40 °C | -40 °C |
| ● max. | 70 °C | 70 °C | 70 °C |
| Air pressure acc. to IEC 60068-2-13 | |||
| ● Operation, min. | 795 hPa | 795 hPa | 795 hPa |
| ● Operation, max. | 1 080 hPa | 1 080 hPa | 1 080 hPa |
| ● Storage/transport, min. | 660 hPa | 660 hPa | 660 hPa |
| ● Storage/transport, max. | 1 080 hPa | 1 080 hPa | 1 080 hPa |
| Relative humidity | |||
| ● Operation at 25 ℃ without condensation, max. | 95 % | 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 | S02: < 0.5 ppm; H2S: < 0.1 ppm; RH < 60% condensation-free |
| connection method / header | |||
| required front connector | Yes | Yes | Yes |
| Mechanics/material | |||
| Enclosure material (front) | |||
| ● Plastic | Yes | Yes | Yes |
| Dimensions | |||
| Width | 45 mm | 45 mm | 45 mm |
| Height | 100 mm | 100 mm | 100 mm |
| Depth | 75 mm | 75 mm | 75 mm |
| Weights | |||
| Weight, approx. | 180 g | 180 g | 180 g |
