| SIMATIC S7-300, ANALOG INPUT SM 331, OPTICALLY ISOLATED, 8 AI, 13 BIT RESOLUTION, U/I/RESISTANCE, PT100, 66 MS MODULE UPDATE, 40 PIN |
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Input current |
from backplane bus 5 V DC, max. | 90 mA |
Power losses |
Power loss, typ. | 0.4 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. | 30 V |
permissible input current for current input (destruction limit), max. | 40 mA; Protection available against destruction |
Input ranges |
Voltage | Yes |
Current | Yes |
Resistance thermometer | Yes |
Resistance | Yes |
Input ranges (rated values), voltages |
0 to +10 V | Yes |
Input resistance (0 to 10 V) | 100 kΩ |
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 |
-50 mV to +50 mV | Yes |
Input resistance (-50 mV to +50 mV) | 10 MΩ |
-500 mV to +500 mV | Yes |
Input resistance (-500 mV to +500 mV) | 10 MΩ |
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 |
Input ranges (rated values), resistance thermometers |
Pt 100 | Yes; Standard/climate |
Input resistance (Pt 100) | 10 MΩ |
Input ranges (rated values), resistors |
0 to 600 ohms | Yes |
Input resistance (0 to 600 ohms) | 10 MΩ |
0 to 6000 ohms | Yes |
Input resistance (0 to 6000 ohms) | 10 MΩ |
Thermocouple (TC) |
Temperature compensation |
Parameterizable | No |
Resistance thermometer (RTD) |
Characteristic linearization |
for resistance thermometer | Pt100 (standard/climate) |
Cable length |
Cable length, shielded, max. | 200 m; 50 m at 50 mV |
Analog value creation |
Integrations and conversion time/ resolution per channel |
Resolution with overrange (bit including sign), max. | 13 bit; Unipolar: 13/13 bits; bipolar: 12 bits + sign/12 bits + sign |
Integration time, ms | 16.67 / 20 ms |
Interference voltage suppression for interference frequency f1 in Hz | 60 / 50 Hz |
Encoder |
Connection of signal encoders |
for current measurement as 2-wire transducer | Yes; with external supply |
for current measurement as 4-wire transducer | Yes |
for resistance measurement with 2-conductor connection | Yes |
for resistance measurement with 3-conductor connection | Yes; with 3-wire compensation |
for resistance measurement with 4-conductor connection | Yes |
Errors/accuracies |
Operational limit in overall temperature range |
Voltage, relative to input area | +/- 0,6 % |
Current, relative to input area | +/- 0,6 % |
Resistance-type thermometer, relative to input area | +/- 0,6 %; +/-1.2 K |
Basic error limit (operational limit at 25 °C) |
Voltage, relative to input area | +/- 0,4 % |
Current, relative to input area | +/- 0,4 % |
Resistance-type thermometer, relative to input area | +/- 0,4 %; +/- 1 K |
Interrupts/diagnostics/status information |
Alarms |
Diagnostic alarm | No |
Limit value alarm | No |
Diagnostic messages |
Diagnostics | No |
Galvanic isolation |
Galvanic isolation analog inputs |
between the channels and the backplane bus | Yes |
Isolation |
Isolation checked with | 600 V DC |
Connection method |
required front connector | 40-pin |
Dimensions |
Width | 40 mm |
Height | 125 mm |
Depth | 120 mm |
Weight |
Weight, approx. | 250 g |
Status | Mar 12, 2012 |