Complaint
The SM 1231 analog input signal modules allow the connection of the controller to analog signals of the process.
This provides users with the following advantages:
The signal modules have the same design features as the basic devices.
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.
| SIMATIC S7-1200, Analog input, SM 1231, 4 AI, +/-10 V, +/-5 V, +/-2.5 V, or 0-20 mA/4-20 mA, 12 bit+sign (13 bit ADC) | |
| General information | |
| Product type designation | SM 1231, AI 4x13 bit |
| Supply voltage | |
| Rated value (DC) | 24 V |
| Input current | |
| Current consumption, typ. | 45 mA 80 mA |
| from backplane bus 5 V DC, typ. | |
| Power loss | |
| Power loss, typ. | 1.5 W |
| Analog inputs | |
| Number of analog inputs | 4; Current or voltage differential inputs 35 V 40 mA 625 µs |
| permissible input voltage for voltage input (destruction limit), max. | |
| permissible input current for current input (destruction limit), max. | |
| Cycle time (all channels) max. | |
| Input ranges | |
| Yes; ±10V, ±5V, ±2.5V Yes; 4 to 20 mA, 0 to 20 mA No No No |
| Input ranges (rated values), voltages | |
| Yes ≥9 MOhm Yes ≥9 MOhm Yes ≥9 MOhm |
| Input ranges (rated values), currents | |
| Yes 280 ohm Yes 280 ohm |
| Analog value generation for the inputs | |
| Integration and conversion time/resolution per channel | |
| 12 bit; + sign Yes 40 dB, DC to 60 V for interference frequency 50 / 60 Hz |
| Smoothing of measured values | |
| Yes Yes Yes Yes Yes |
| Errors/accuracies | |
| Temperature error (relative to input range), (+/-) | 25 °C ±0.1%, to 55 °C ±0.2% total measurement range |
| Basic error limit (operational limit at 25 °C) | |
| 0.1 % |
| 0.1 % |
| Interference voltage suppression for f = n x (f1 +/- 1 %), f1 = interference frequency | |
| 12 V |
| Interrupts/diagnostics/status information | |
| Alarms | Yes Yes |
| Diagnostics function | |
| Alarms | |
| Yes |
| Diagnoses | |
| Yes Yes |
| Diagnostics indication LED | |
| Yes Yes |
| Degree and class of protection | |
| IP degree of protection | IP20 |
| Standards, approvals, certificates | |
| CE mark | Yes |
| CSA approval | Yes Yes Yes |
| UL approval | |
| cULus | |
| FM approval | Yes |
| RCM (formerly C-TICK) | Yes Yes Yes |
| KC approval | |
| Marine approval | |
| Ambient conditions | |
| Free fall | |
| 0.3 m; five times, in product package |
| Ambient temperature during operation | |
| -20 °C 60 °C -20 °C 60 °C -20 °C 50 °C |
| Ambient temperature during storage/transportation | |
| -40 °C 70 °C |
| Air pressure acc. to IEC 60068-2-13 | |
| 795 hPa 1 080 hPa 660 hPa 1 080 hPa |
| Relative humidity | |
| 95 % |
| Pollutant concentrations | |
| S02: < 0.5 ppm; H2S: < 0.1 ppm; RH < 60% condensation-free |
| connection method / header | |
| required front connector | Yes |
| Mechanics/material | |
Enclosure material (front)
| Yes |
| Dimensions | |
| Width | 45 mm 100 mm 75 mm |
| Height | |
| Depth | |
| Weights | |
| Weight, approx. | 180 g |
