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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.
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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 |
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Weight | N/A |
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Dimensions | N/A |
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