| SIMATIC S7-1200, ANALOG INPUT, SM 1231, 8 AI, +/-10V, +/-5V, +/-2.5V, OR 0-20 MA 12 BIT + SIGN OR (13 BIT ADC) |
| Supply voltage |
| 24 V DC | Yes |
| Input current |
| Current consumption, typ. | 45 mA |
| from backplane bus 5 V DC, typ. | 90 mA |
| Power losses |
| Power loss, typ. | 1.5 W |
| Analog inputs |
| Number of analog inputs | 8; Current or voltage differential inputs |
| permissible input frequency for current input (destruction limit), max. | ± 35 V |
| permissible input voltage for voltage input (destruction limit), max. | 35 V |
| permissible input current for voltage input (destruction limit), max. | 40 mA |
| Cycle time (all channels) max. | 625 µs |
| permissible input current for current input (destruction limit), max. | 40 mA |
| Input ranges |
| Voltage | Yes; ±10 V, ±5 V, ±2.5 V |
| Current | Yes; 0 to 20 mA |
| Thermocouple | No |
| Resistance thermometer | No |
| Resistance | No |
| Input ranges (rated values), voltages |
| -10 V to +10 V | Yes |
| Input resistance (-10 V to +10 V) | ≥9 MOhm |
| -2.5 V to +2.5 V | Yes |
| Input resistance (-2.5 V to +2.5 V) | ≥9 MOhm |
| -5 V to +5 V | Yes |
| Input resistance (-5 V to +5 V) | ≥9 MOhm |
| Input ranges (rated values), currents |
| 0 to 20 mA | Yes |
| Input resistance (0 to 20 mA) | 280 Ω |
| Temperature compensation |
| Parameterizable | No |
| Analog outputs |
| Number of analog outputs | 0 |
| Analog value creation |
| Integrations and conversion time/ resolution per channel |
| Resolution with overrange (bit including sign), max. | 12 bit; + sign |
| Integration time, parameterizable | Yes |
| Interference voltage suppression for interference frequency f1 in Hz | 40 dB, DC to 60 V for interference frequency 50 / 60 Hz |
| Smoothing of measured values |
| Parameterizable | Yes |
| Step: None | Yes |
| Step: low | Yes |
| Step: Medium | Yes |
| Step: High | Yes |
| Errors/accuracies |
| Temperature error (relative to input area) | 25 °C ±0.1 % to 55 °C ±0.2 % total measurement range |
| Basic error limit (operational limit at 25 °C) |
| Voltage, relative to input area | +/- 0,1 % |
| Current, relative to input area | +/- 0,1 % |
| Interference voltage suppression for f = n x (fl +/- 1%), fl = interference frequency |
| common mode voltage, max. | 12 V |
| Interrupts/diagnostics/status information |
| Alarms |
| Alarms | Yes |
| Diagnostic alarm | Yes |
| Diagnoses |
| Diagnostic functions | Yes |
| Monitoring the supply voltage to the electronics | Yes |
| Wire break | No |
| Diagnostics indication LED |
| for status of the inputs | Yes |
| for maintenance | Yes |
| Galvanic isolation |
| Galvanic isolation analog outputs |
| between the channels and the power supply of the electronics | No |
| Climatic and mechanical conditions for storage and transport |
| Climatic conditions for storage and transport |
| Free fall |
| Drop height, max. (in packaging) | 0.3 m; five times, in dispatch package |
| Temperature |
| Permissible temperature range | -40 °C to +70 °C |
| Air pressure acc. to IEC 60068-2-13 |
| Permissible air pressure | 1080 to 660 hPa |
| Mechanical and climatic conditions during operation |
| Climatic conditions in operation |
| Temperature |
| Permissible temperature range | 0 °C to 55 °C horizontal installation 0 °C to 45 °C vertical installation |
| Air pressure acc. to IEC 60068-2-13 |
| Permissible air pressure | 1080 to 795 hPa |
| Pollutant concentrations |
| SO2 at RH < 60% without condensation | S02: < 0.5 ppm; H2S: < 0.1 ppm; RH < 60% condensation-free |
| Degree and class of protection |
| IP20 | Yes |
| Standards, approvals, certificates |
| CE mark | Yes |
| C-TICK | Yes |
| FM approval | Yes |
| Connection method |
| required front connector | Yes |
| Mechanics/material |
| Type of housing (front) | |
| Plastic | Yes |
| Dimensions |
| Width | 45 mm |
| Height | 100 mm |
| Depth | 75 mm |
| Weight |
| Weight, approx. | 180 g |
