| SIMATIC S7-300, ANALOG INPUT SM 331, GALVANICALLY ISOLATED, 8 AI, 14 BIT, 0.052MS/CHANNEL, CURRENT, VOLTAGE, INTERRUPTS, DIAGNOSTICS,20 PIN, FIT FOR ISOCHRONE MODE |
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Input current |
from backplane bus 5 V DC, max. | 100 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 |
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 to 10 V | Yes |
Input resistance (1 to 10 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 |
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 |
Integrations and conversion time/ resolution per channel |
Resolution with overrange (bit including sign), max. | 14 bit |
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 |
Limit value alarm | Yes |
Diagnostic messages |
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 |
Weight |
Weight, approx. | 230 g |
Status | Mar 12, 2012 |