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SIMATIC S7-400, SM 431 ANALOG INPUT MODULE OPTIC. ISOLATED, 8 AI, 14 BIT RESOLUTION, U/I/RESIST. 0.416 MS SCAN TIME |
| 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. |
200 mA; for 8 connected, fully controlled 2-wire transmitters |
| from backplane bus 5 V DC, max. |
1 000 mA |
| Power losses |
| Power loss, typ. |
4.9 W |
| Hardware configuration |
| Slots |
| ● Required slots |
1 |
| Analog inputs |
| Number of analog inputs |
8 |
| Number of analog inputs for voltage/current measurement |
8 |
| Number of analog inputs for resistance measurement |
4 |
| permissible input voltage for voltage input (destruction limit), max. |
18 V; 18 V continuous, 75 V for 1 ms (mark to space ratio 1:20) |
| permissible input current for current input (destruction limit), max. |
40 mA; Permanent |
| Input ranges |
| ● Voltage |
Yes |
| ● Current |
Yes |
| ● Thermocouple |
No |
| ● Resistance thermometer |
No |
| ● Resistance |
Yes |
| Input ranges (rated values), voltages |
| ● 1 to 5 V |
Yes |
| ● Input resistance (1 to 5 V) |
10 MΩ |
| ● -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 kΩ |
| Input ranges (rated values), resistors |
| ● 0 to 600 ohms |
Yes |
| Cable length |
| ● Cable length, shielded, max. |
200 m |
| Analog value creation |
| Integration and conversion time/resolution per channel |
| ● Resolution with overrange (bit including sign), max. |
14 bit; 14 / 14 / 14 |
| ● Integration time, parameterizable |
Yes |
| ● Basic conversion time, ms |
52 µs |
| ● Interference voltage suppression for interference frequency f1 in Hz |
none / 400 / 60 / 50 Hz |
| Encoder |
| Connection of signal encoders |
| ● for current measurement as 2-wire transducer |
Yes |
| ● for current measurement as 4-wire transducer |
Yes |
| ● for resistance measurement with two-wire connection |
Yes; Line resistances are also measured |
| ● for resistance measurement with three-wire connection |
Yes; Line resistances are also measured |
| ● for resistance measurement with four-wire connection |
Yes |
| Errors/accuracies |
| Operational limit in overall temperature range |
| ● Voltage, relative to input area, (+/-) |
0.7 %; +/-0.7% at +/-1 V; +/-0.9% at +/-10 V, 1 to 5 V |
| ● Current, relative to input area, (+/-) |
0.8 %; at +/-20 mA, 4 to 20 mA |
| ● Resistance, relative to input area, (+/-) |
1 % |
| Basic error limit (operational limit at 25 °C) |
| ● Voltage, relative to input area, (+/-) |
0.6 %; 0.6% at +/-1 V; 0.75% at +/-10 V, 1 to 5 V |
| ● Current, relative to input area, (+/-) |
0.7 %; at +/-20 mA, 4 to 20 mA |
| ● Resistance, relative to input area, (+/-) |
0.7 %; 0 to 600 ohms |
| Galvanic isolation |
| Galvanic isolation analog inputs |
| ● Galvanic isolation analog inputs |
Yes; internal/external |
| ● between the channels |
No |
| Permissible potential difference |
| between the inputs (UCM) |
8 V AC |
| Isolation |
| Isolation checked with |
2120 V DC between bus and analog part; 500 V DC between bus and local ground; 707 V DC between analog part and L+/M; 2120 V DC between analog part and local ground; 2120 V DC between L+/M and local ground |
| Dimensions |
| Width |
25 mm |
| Height |
290 mm |
| Depth |
210 mm |
| Weights |
| Weight, approx. |
500 g |
| last modified: |
25.09.2014 |
