| | SIMATIC S7-400, ANALOG INPUT SM 431, NON-ISOLATED 16 AI, RESOLUTION 13 BITS, +/-10V, +/-20MA, 4 - 20MA 20 MS MODULE UPDATE |
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| Supply voltage |
| Load voltage L+ |
| Rated value (DC) | 24 V; Only required for supplying 2-wire transmitters |
| Reverse polarity protection | Yes |
| Input current |
| from load voltage L+ (without load), max. | 400 mA; for 16 connected, fully controlled 2-wire transmitters |
| from backplane bus 5 V DC, max. | 100 mA |
| Power losses |
| Power loss, typ. | 2 W |
| Analog inputs |
| Number of analog inputs | 16 |
| Number of analog inputs for voltage/current measurement | 16 |
| permissible input voltage for voltage input (destruction limit), max. | 20 V; 20 V DC permanent, 75 V DC for max. 1 s (duty factor 1:20) |
| permissible input current for current input (destruction limit), max. | 40 mA |
| Input ranges |
| Voltage | Yes |
| Current | Yes |
| Input ranges (rated values), voltages |
| 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 |
| Input ranges (rated values), currents |
| -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 |
| Cable length |
| Cable length, shielded, max. | 200 m |
| Analog value creation |
| Integrations and conversion time/ resolution per channel |
| Resolution with overrange (bit including sign), max. | 13 bit |
| Integration time, parameterizable | Yes |
| Basic conversion time, ms | 55 / 65 ms |
| Integration time, ms | 50 / 60 ms |
| Interference voltage suppression for interference frequency f1 in Hz | 60 / 50 Hz |
| Encoder |
| Connection of signal encoders |
| for current measurement as 4-wire transducer | Yes |
| Errors/accuracies |
| Operational limit in overall temperature range |
| Voltage, relative to input area | +/- 0,65 %; 1.0% at 1 to 5 V; 0.65% at +/-1 V, +/-10 V |
| Current, relative to input area | +/- 0,65 % |
| Basic error limit (operational limit at 25 °C) |
| Voltage, relative to input area | +/- 0,25 %; 0.5% at 1 to 5 V; 0.25% at +/-1 V, +/-10 V |
| Current, relative to input area | +/- 0,25 %; at +/-20 mA, 4 to 20 mA |
| Galvanic isolation |
| Galvanic isolation analog inputs |
| Galvanic isolation analog inputs | No |
| between the channels | No |
| Permissible potential difference |
| between the inputs (UCM) | 2 V DC / 2 Vpp AC |
| Isolation |
| Isolation checked with | 500 V DC between bus and local ground |
| Dimensions |
| Width | 25 mm |
| Height | 290 mm |
| Depth | 210 mm |
| Required slots | 1 |
| Weight |
| Weight, approx. | 500 g |
| Status | Mar 12, 2012 |
