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SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED 16DI, 24 V DC, SOURCE INPUT, 1 X 20 PIN |
| 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 backplane bus 5 V DC, max. |
10 mA |
| Power losses |
| Power loss, typ. |
3.5 W |
| Digital inputs |
| Number of digital inputs |
16 |
| Input characteristic curve in accordance with IEC 61131, type 1 |
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" |
-5 to +30 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 |
No |
| — at "0" to "1", min. |
1.2 ms |
| — at "0" to "1", max. |
4.8 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. |
1.5 mA |
| Isochronous mode |
| Isochronous operation (application synchronized up to terminal) |
No |
| Interrupts/diagnostics/status information |
| Alarms |
| ● Alarms |
No |
| ● Diagnostic alarm |
No |
| ● Hardware interrupt |
No |
| Diagnostic messages |
| ● Diagnostic functions |
No |
| Diagnostics indication LED |
| ● 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: |
25.09.2014 |
