| | SIMATIC S7-400, DIG.INPUT MOD. SM 421, OPTIC. ISOLATED, 16 DI, 24V DC WITH 0,1 MS INPUT DELAY, ALARM, 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 backplane bus 5 V DC, max. | 130 mA |
| from supply voltage L+, max. | 120 mA |
| Power losses |
| Power loss, max. | 5 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 DC |
| for signal "1" | 11 to 30 V DC |
| Input current |
| for signal "1", typ. | 6 mA; 6 to 8 mA |
| Input delay (for rated value of input voltage) |
| for standard inputs |
| Parameterizable | Yes; 0.1 / 0.5 / 3 ms |
| Cable length |
| Cable length, shielded, max. | 1000 m; 1000 m/3 ms; 70 m/0.5 ms; 30 m/0.1 ms |
| Cable length unshielded, max. | 600 m; 600 m: 3 ms; 50 m: 0.5 ms; 20 m: 0.1 ms |
| Encoder |
| Connectable encoders |
| 2-wire sensor | Yes |
| Permissible quiescent current (2-wire sensor), max. | 3 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 | 8 |
| between the channels and the backplane bus | Yes |
| Isolation |
| Isolation checked with | 500 V DC |
| Dimensions |
| Width | 25 mm |
| Height | 290 mm |
| Depth | 210 mm |
| Weight |
| Weight, approx. | 600 g |
| Status | Mar 12, 2012 |
