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SIMATIC S7-300, DIGITAL INPUT SM 321, GALVANICALLY ISOLATED, 16 DI, DC 24V, 1 X 20 PIN, PROCESS INTERRUPT, DIAGNOSTICS, FIT FOR ISOCHRONE MODE |
| Supply voltage |
| Load voltage L+ |
| ● Rated value (DC) |
24 V |
| ● permissible range, lower limit (DC) |
20.4 V |
| ● permissible range, upper limit (DC) |
28.8 V |
| Input current |
| from load voltage L+ (without load), max. |
90 mA |
| from backplane bus 5 V DC, max. |
130 mA |
| Power losses |
| Power loss, typ. |
4 W |
| Digital inputs |
| Number of digital inputs |
16 |
| Input characteristic curve in accordance with IEC 61131, type 2 |
Yes |
| Number of simultaneously controllable inputs |
| horizontal installation |
| — up to 40 °C, max. |
16 |
| — up to 60 °C, max. |
16 |
| vertical installation |
| — up to 40 °C, max. |
16 |
| Input voltage |
| ● Type of input voltage |
DC |
| ● Rated value (DC) |
24 V |
| ● for signal "0" |
-30 to +5 V |
| ● for signal "1" |
13 to 30 V |
| Input current |
| ● for signal "1", typ. |
7 mA |
| Input delay (for rated value of input voltage) |
| for standard inputs |
| — Parameterizable |
Yes; 0.1 / 0.5 / 3 / 15 / 20 ms |
| Cable length |
| ● Cable length, shielded, max. |
1 000 m |
| ● Cable length unshielded, max. |
600 m |
| Encoder |
| Connectable encoders |
| ● 2-wire sensor |
Yes |
| — Permissible quiescent current (2-wire sensor), max. |
2 mA |
| Isochronous mode |
| Isochronous operation (application synchronized up to terminal) |
Yes |
| Interrupts/diagnostics/status information |
| Alarms |
| ● Alarms |
Yes |
| ● Diagnostic alarm |
Yes; Parameterizable |
| ● Hardware interrupt |
Yes; Parameterizable |
| Diagnostic messages |
| ● Diagnostic functions |
Yes; Parameterizable |
| Diagnostics indication LED |
| ● Group error SF (red) |
Yes |
| ● Status indicator digital input (green) |
Yes |
| Galvanic isolation |
| Galvanic isolation digital inputs |
| ● between the channels |
No |
| ● between the channels, in groups of |
16 |
| ● between the channels and the backplane bus |
Yes; Optocoupler |
| Permissible potential difference |
| between different circuits |
75 VDC / 60 VAC |
| 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: |
13.10.2014 |
