| | SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED, 16 DI, DC 24V, 20 PIN, PROCESS INTERRUPT, DIAGNOSTICS |
| |
| 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. | 40 mA |
| from backplane bus 5 V DC, max. | 55 mA |
| Power losses |
| Power loss, typ. | 4 W |
| Digital inputs |
| Number/binary inputs | 16 |
| Number of simultaneously controllable inputs |
| all mounting positions |
| up to 40 °C, max. | 16 |
| up to 60 °C, max. | 16 |
| Input voltage |
| 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. | 1000 m |
| Cable length unshielded, max. | 600 m |
| Encoder |
| Connectable encoders |
| 2-wire sensor | Yes |
| Permissible quiescent current (2-wire sensor), max. | 1.5 mA |
| Interrupts/diagnostics/status information |
| Alarms |
| Diagnostic alarm | Yes |
| Hardware interrupt | Yes |
| Diagnostic messages |
| Diagnostics | Yes; internal/ external fault |
| Galvanic isolation |
| Galvanic isolation digital inputs |
| between the channels, in groups of | 16 |
| between the channels and the backplane bus | Yes; Optocoupler |
| 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. | 200 g |
| Status | Mar 12, 2012 |
