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SIMATIC S7-300, ANALOG INPUT SM 331, OPT. ISOL.,2/3/4 WIRE, 8AI, RESISTANCE, PT100/200/1000 NI100/120/200/500/1000, CU10, 16 (INTERN 24) BIT, 50MS,40 PIN |
| Supply voltage |
| Load voltage L+ |
| ● Rated value (DC) |
24 V |
| ● Reverse polarity protection |
Yes |
| Input current |
| from load voltage L+ (without load), max. |
240 mA |
| from backplane bus 5 V DC, max. |
100 mA |
| Power loss |
| Power loss, typ. |
4.6 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. |
75 V; 35 V continuous, 75 V for max. 1 s (mark to space ratio 1:20) |
| Input ranges |
| ● Resistance thermometer |
Yes |
| ● Resistance |
Yes |
| Input ranges (rated values), resistance thermometers |
| ● Cu 10 |
Yes |
| ● Ni 100 |
Yes |
| ● Ni 1000 |
Yes |
| ● Ni 120 |
Yes |
| ● Ni 200 |
Yes |
| ● Ni 500 |
Yes |
| ● Pt 100 |
Yes |
| ● Pt 1000 |
Yes |
| ● Pt 200 |
Yes |
| ● Pt 500 |
Yes |
| Input ranges (rated values), resistors |
| ● 0 to 150 Ohm |
Yes |
| ● 0 to 300 Ohm |
Yes |
| ● 0 to 600 Ohm |
Yes |
| Characteristic linearization |
| ● parameterizable |
Yes |
| — for resistance thermometer |
Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni200, Ni500, Ni1000, Cu10; (standard/climate) |
| Cable length |
| ● Cable length, shielded, max. |
200 m |
| Analog value generation |
| Measurement principle |
integrating |
| Integration and conversion time/resolution per channel |
| ● Resolution with overrange (bit including sign), max. |
16 bit; Two''s complement |
| ● Integration time, parameterizable |
Yes |
| ● Basic conversion time, ms |
up to 4 channels: 10 ms per module, over 5 channels: 190 ms per module, 8 channels: 80 ms |
| ● Interference voltage suppression for interference frequency f1 in Hz |
400 / 60 / 50 Hz |
| Encoder |
| Connection of signal encoders |
| ● for resistance measurement with two-wire connection |
Yes; without resistance correction |
| ● for resistance measurement with three-wire connection |
Yes |
| ● for resistance measurement with four-wire connection |
Yes |
| Errors/accuracies |
| Operational error limit in overall temperature range |
| ● Resistance, relative to input area, (+/-) |
0.1 % |
| ● Resistance thermometer, relative to input area, (+/-) |
+/- 1 K |
| Basic error limit (operational limit at 25 °C) |
| ● Resistance, relative to input area, (+/-) |
0.05 % |
| ● Resistance thermometer, relative to input area, (+/-) |
+/- 0,5 K |
| Isochronous mode |
| Isochronous mode (application synchronized up to terminal) |
No |
| Interrupts/diagnostics/status information |
| Alarms |
| ● Diagnostic alarm |
Yes; Parameterizable per group |
| ● Limit value alarm |
Yes; Parameterizable |
| Diagnostic messages |
| ● Diagnostic functions |
Yes; Parameterizable |
| ● Diagnostic information readable |
Yes |
| ● Diagnostics |
Yes |
| Diagnostics indication LED |
| ● Group error SF (red) |
Yes |
| Galvanic isolation |
| Galvanic isolation analog inputs |
| ● between the channels |
Yes |
| ● between the channels, in groups of |
2 |
| ● between the channels and the backplane bus |
Yes |
| Isolation |
| Isolation tested with |
500 V DC |
| Connection method |
| required front connector |
40-pin |
| Dimensions |
| Width |
40 mm |
| Height |
125 mm |
| Depth |
120 mm |
| Weights |
| Weight, approx. |
272 g |
| last modified: |
21.08.2014 |
