| General information |
| Product type designation | SB 1221, DI 4x24 V DC 200 kHz |
| Input current |
| from backplane bus 5 V DC, typ. | 40 mA |
| Power loss |
| Power loss, typ. | 1 W |
| Digital inputs |
| Number of digital inputs | 4; Current-sourcing |
| ● in groups of | 4 |
| Input voltage |
| ● Rated value (DC) | 24 V |
| ● for signal "0" | (L+ minus 5.0 V DC) ... L+ (1.4 ... 0 mA) |
| ● for signal "1" | 0 V ... (L+ minus 10 V DC (10 ... 2.9 mA)) |
| Input current |
| ● for signal "0", max. (permissible quiescent current) | 1.4 mA |
| ● for signal "1", min. | 2.9 mA |
| ● for signal "1", typ. | 7 mA |
| Input delay (for rated value of input voltage) |
| for standard inputs |
| — parameterizable | Yes; 0.1 / 0.2 / 0.4 / 0.8 / 1.6 / 3.2 / 6.4 / 10.0 / 12.8 / 20.0 μs; 0.05 / 0.1 / 0.2 / 0.4 / 0.8 / 1.6 / 3.2 / 6.4 / 10.0 / 12.8 / 20.0 ms |
| for interrupt inputs |
| — parameterizable | Yes |
| for technological functions |
| — parameterizable | Yes |
| Cable length |
| ● shielded, max. | 50 m; shielded, twisted pair |
| Interrupts/diagnostics/status information |
| Diagnostics indication LED |
| ● for status of the inputs | Yes |
| Standards, approvals, certificates |
| CE mark | Yes |
| CSA approval | Yes |
| UL approval | Yes |
| cULus | Yes |
| FM approval | Yes |
| RCM (formerly C-TICK) | Yes |
| KC approval | Yes |
| Marine approval | Yes |
| Ambient conditions |
| Free fall |
| ● Fall height, max. | 0.3 m; five times, in product package |
| Ambient temperature during operation |
| ● min. | -20 °C |
| ● max. | 60 °C |
| ● horizontal installation, min. | -20 °C |
| ● horizontal installation, max. | 60 °C |
| ● vertical installation, min. | -20 °C |
| ● vertical installation, max. | 50 °C |
| Ambient temperature during storage/transportation |
| ● min. | -40 °C |
| ● max. | 70 °C |
| Air pressure acc. to IEC 60068-2-13 |
| ● Storage/transport, min. | 660 hPa |
| ● Storage/transport, max. | 1 080 hPa |
| Relative humidity |
| ● Operation at 25 ℃ without condensation, max. | 95 % |
| Mechanics/material |
| Enclosure material (front) | |
| ● Plastic | Yes |
| Dimensions |
| Width | 38 mm |
| Height | 62 mm |
| Depth | 21 mm |
| Weights |
| Weight, approx. | 35 g |