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SIMATIC S7-300, ANALOG INPUT SM 331, GALVANICALLY ISOLATED, 8 AI, 14 BIT, 0.052MS/CHANNEL, CURRENT, VOLTAGE, INTERRUPTS, DIAGNOSTICS,1 X 20 PIN, FIT FOR ISOCHRONE MODE IMPROVED DP-CYCLE TIME FOR ISOCHRONE MODE |
| Supply voltage |
| Load voltage L+ |
| ● Rated value (DC) |
24 V |
| ● Reverse polarity protection |
Yes |
| Input current |
| from load voltage L+ (without load), max. |
50 mA |
| from backplane bus 5 V DC, max. |
60 mA |
| Power losses |
| Power loss, typ. |
1.5 W |
| Analog inputs |
| Number of analog inputs |
8 |
| 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 |
| ● Thermocouple |
No |
| ● Resistance thermometer |
No |
| ● Resistance |
No |
| Input ranges (rated values), voltages |
| ● 0 to +10 V |
No |
| ● 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 |
| ● -500 mV to +500 mV |
Yes |
| ● -80 mV to +80 mV |
Yes |
| 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 |
| Cable length |
| ● Cable length, shielded, max. |
200 m |
| Analog value creation |
| Measurement principle |
Actual value encryption |
| Integration and conversion time/resolution per channel |
| ● Resolution with overrange (bit including sign), max. |
14 bit; Unipolar: 14 bits; bipolar: 13 bits + sign |
| ● Integration time, parameterizable |
Yes |
| ● Basic conversion time, ms |
52 µs per channel |
| ● 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 |
| Errors/accuracies |
| Operational limit in overall temperature range |
| ● Voltage, relative to input area, (+/-) |
0.4 % |
| ● Current, relative to input area, (+/-) |
0.3 % |
| Basic error limit (operational limit at 25 °C) |
| ● Voltage, relative to input area, (+/-) |
0.25 % |
| ● Current, relative to input area, (+/-) |
0.2 % |
| Isochronous mode |
| Isochronous operation (application synchronized up to terminal) |
Yes |
| Interrupts/diagnostics/status information |
| Alarms |
| ● Diagnostic alarm |
Yes; Parameterizable |
| ● Limit value alarm |
Yes; Parameterizable, channels 0 and 2 |
| Diagnostic messages |
| ● Diagnostic functions |
Yes |
| ● Diagnostic information readable |
Yes |
| ● Diagnostics |
Yes |
| Diagnostics indication LED |
| ● Group error SF (red) |
Yes |
| Galvanic isolation |
| Galvanic isolation analog inputs |
| ● between the channels |
No |
| ● between the channels and the backplane bus |
Yes |
| Isolation |
| Isolation checked with |
500 V DC |
| Connection method |
| required front connector |
20-pin |
| Dimensions |
| Width |
40 mm |
| Height |
125 mm |
| Depth |
120 mm |
| Weights |
| Weight, approx. |
200 g |
| last modified: |
25.09.2014 |
