| | SIMATIC S7-300, ANALOG INPUT SM 331, OPTICALLY ISOLATED, 8 AI, 13 BIT RESOLUTION, U/I/RESISTANCE, PT100, 66 MS MODULE UPDATE, 40 PIN |
| |
| Input current |
| from backplane bus 5 V DC, max. | 90 mA |
| Power losses |
| Power loss, typ. | 0.4 W |
| Analog inputs |
| Number of analog inputs | 8 |
| Number of analog inputs for resistance measurement | 8 |
| permissible input voltage for voltage input (destruction limit), max. | 30 V |
| permissible input current for current input (destruction limit), max. | 40 mA; Protection available against destruction |
| Input ranges |
| Voltage | Yes |
| Current | Yes |
| Resistance thermometer | Yes |
| Resistance | Yes |
| Input ranges (rated values), voltages |
| 0 to +10 V | Yes |
| Input resistance (0 to 10 V) | 100 kΩ |
| 1 to 5 V | Yes |
| Input resistance (1 to 5 V) | 100 kΩ |
| -1 V to +1 V | Yes |
| Input resistance (-1 V to +1 V) | 10 MΩ |
| -10 V to +10 V | Yes |
| Input resistance (-10 V to +10 V) | 100 kΩ |
| -5 V to +5 V | Yes |
| Input resistance (-5 V to +5 V) | 100 kΩ |
| -50 mV to +50 mV | Yes |
| Input resistance (-50 mV to +50 mV) | 10 MΩ |
| -500 mV to +500 mV | Yes |
| Input resistance (-500 mV to +500 mV) | 10 MΩ |
| Input ranges (rated values), currents |
| 0 to 20 mA | Yes |
| Input resistance (0 to 20 mA) | 50 Ω |
| -20 to +20 mA | Yes |
| Input resistance (-20 to +20 mA) | 50 Ω |
| 4 to 20 mA | Yes |
| Input resistance (4 to 20 mA) | 50 Ω |
| Input ranges (rated values), resistance thermometers |
| Pt 100 | Yes; Standard/climate |
| Input resistance (Pt 100) | 10 MΩ |
| Input ranges (rated values), resistors |
| 0 to 600 ohms | Yes |
| Input resistance (0 to 600 ohms) | 10 MΩ |
| 0 to 6000 ohms | Yes |
| Input resistance (0 to 6000 ohms) | 10 MΩ |
| Thermocouple (TC) |
| Temperature compensation |
| Parameterizable | No |
| Resistance thermometer (RTD) |
| Characteristic linearization |
| for resistance thermometer | Pt100 (standard/climate) |
| Cable length |
| Cable length, shielded, max. | 200 m; 50 m at 50 mV |
| Analog value creation |
| Integrations and conversion time/ resolution per channel |
| Resolution with overrange (bit including sign), max. | 13 bit; Unipolar: 13/13 bits; bipolar: 12 bits + sign/12 bits + sign |
| Integration time, ms | 16.67 / 20 ms |
| Interference voltage suppression for interference frequency f1 in Hz | 60 / 50 Hz |
| Encoder |
| Connection of signal encoders |
| for current measurement as 2-wire transducer | Yes; with external supply |
| for current measurement as 4-wire transducer | Yes |
| for resistance measurement with 2-conductor connection | Yes |
| for resistance measurement with 3-conductor connection | Yes; with 3-wire compensation |
| for resistance measurement with 4-conductor connection | Yes |
| Errors/accuracies |
| Operational limit in overall temperature range |
| Voltage, relative to input area | +/- 0,6 % |
| Current, relative to input area | +/- 0,6 % |
| Resistance-type thermometer, relative to input area | +/- 0,6 %; +/-1.2 K |
| Basic error limit (operational limit at 25 °C) |
| Voltage, relative to input area | +/- 0,4 % |
| Current, relative to input area | +/- 0,4 % |
| Resistance-type thermometer, relative to input area | +/- 0,4 %; +/- 1 K |
| Interrupts/diagnostics/status information |
| Alarms |
| Diagnostic alarm | No |
| Limit value alarm | No |
| Diagnostic messages |
| Diagnostics | No |
| Galvanic isolation |
| Galvanic isolation analog inputs |
| between the channels and the backplane bus | Yes |
| Isolation |
| Isolation checked with | 600 V DC |
| Connection method |
| required front connector | 40-pin |
| Dimensions |
| Width | 40 mm |
| Height | 125 mm |
| Depth | 120 mm |
| Weight |
| Weight, approx. | 250 g |
| Status | Mar 12, 2012 |
