| | SIMATIC S7-300, ANALOG INPUT SM 331, OPT. ISOL.,2/3/4 WIRE, 8AI, RESISTANCE, PT100/200/1000 NI100/120/200/500/1000, CU10, 16 (INTERN 24) BIT, 50MS,40 PIN |
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| Supply voltage |
| Load voltage L+ |
| Rated value (DC) | 24 V |
| Reverse polarity protection | Yes |
| Input current |
| from load voltage L+ (without load), max. | 240 mA |
| from backplane bus 5 V DC, max. | 100 mA |
| Power losses |
| Power loss, typ. | 4.6 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. | 75 V; 35 V continuous, 75 V for max. 1 s (mark to space ratio 1:20) |
| Input ranges |
| Resistance thermometer | Yes |
| Resistance | Yes |
| Input ranges (rated values), resistance thermometers |
| Cu 10 | Yes |
| Ni 100 | Yes |
| Ni 1000 | Yes |
| Ni 120 | Yes |
| Ni 200 | Yes |
| Ni 500 | Yes |
| Pt 100 | Yes |
| Pt 1000 | Yes |
| Pt 200 | Yes |
| Pt 500 | Yes |
| Input ranges (rated values), resistors |
| 0 to 150 ohms | Yes |
| 0 to 300 ohms | Yes |
| 0 to 600 ohms | Yes |
| Resistance thermometer (RTD) |
| Characteristic linearization |
| for resistance thermometer | Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni200, Ni500, Ni1000, Cu10; (standard/climate) |
| Characteristic linearization |
| Parameterizable | Yes |
| Cable length |
| Cable length, shielded, max. | 200 m |
| Analog value creation |
| Measurement principle | integrating |
| Integrations and conversion time/ resolution per channel |
| Resolution with overrange (bit including sign), max. | 16 bit; Two's complement |
| Integration time, parameterizable | Yes |
| Basic conversion time, ms | up to 4 channels: 10 ms per module, over 5 channels: 190 ms per module, 8 channels: 80 ms |
| Interference voltage suppression for interference frequency f1 in Hz | 400 / 60 / 50 Hz |
| Encoder |
| Connection of signal encoders |
| for resistance measurement with 2-conductor connection | Yes; without resistance correction |
| for resistance measurement with 3-conductor connection | Yes |
| for resistance measurement with 4-conductor connection | Yes |
| Errors/accuracies |
| Operational limit in overall temperature range |
| Impedance, relative to input area | +/- 0,1 % |
| Resistance-type thermometer, relative to input area | +/- 1 K |
| Basic error limit (operational limit at 25 °C) |
| Impedance, relative to input area | +/- 0,05 % |
| Resistance-type thermometer, relative to input area | +/- 0.5 K |
| Isochronous mode |
| Isochronous operation (application synchronized up to terminal) | No |
| Interrupts/diagnostics/status information |
| Alarms |
| Diagnostic alarm | Yes; Parameterizable per group |
| Limit value alarm | Yes; Parameterizable |
| Diagnostic messages |
| Diagnostic functions | Yes; Parameterizable |
| Diagnostic information readable | Yes |
| Diagnostics | Yes |
| Diagnostics indication LED |
| Group error SF (red) | Yes |
| Galvanic isolation |
| Galvanic isolation analog inputs |
| between the channels | Yes |
| between the channels, in groups of | 2 |
| between the channels and the backplane bus | Yes |
| Isolation |
| Isolation checked with | 500 V DC |
| Connection method |
| required front connector | 40-pin |
| Dimensions |
| Width | 40 mm |
| Height | 125 mm |
| Depth | 120 mm |
| Weight |
| Weight, approx. | 272 g |
| Status | Mar 12, 2012 |
