USD 160.16 USD 242.06Price range: USD 160.16 through USD 242.06
The SM 1221 digital input signal modules convert the level of the external digital signals from the process into the internal signal level of the S7-1200 controller.
| Article number | 6ES7221-1BF32-0XB0 | 6ES7221-1BH32-0XB0 |
| Digital Input SM 1221, 8DI, 24V DC | Digital Input SM 1221, 16DI, 24V DC | |
| General information | ||
| Product type designation | SM 1221, DI 8×24 V DC | SM 1221, DI 16×24 V DC |
| Supply voltage | ||
| Rated value (DC) | 24 V | 24 V |
| permissible range, lower limit (DC) | 20.4 V | 20.4 V |
| permissible range, upper limit (DC) | 28.8 V | 28.8 V |
| Input current | ||
| from backplane bus 5 V DC, max. | 105 mA | 130 mA |
| Digital inputs | ||
| ● from load voltage L+ (without load), max. | 4 mA; per channel | 4 mA; per channel |
| output voltage / header | ||
| supply voltage of the transmitters / header | ||
| ● product function / supply voltage for transmitters | Yes | Yes |
| Power loss | ||
| Power loss, typ. | 1.5 W | 2.5 W |
| Digital inputs | ||
| Number of digital inputs | 8 | 16 |
| ● in groups of | 2 | 4 |
| Input characteristic curve in accordance with IEC 61131, type 1 | Yes | Yes |
| Number of simultaneously controllable inputs | ||
| all mounting positions | ||
| — up to 40 °C, max. | 8 | 16 |
| horizontal installation | ||
| — up to 40 °C, max. | 8 | 16 |
| — up to 50 °C, max. | 8 | 16 |
| vertical installation | ||
| — up to 40 °C, max. | 8 | 16 |
| Input voltage | ||
| ● Rated value (DC) | 24 V | 24 V |
| ● for signal “0” | 5 V DC at 1 mA | 5 V DC at 1 mA |
| ● for signal “1” | 15 V DC at 2.5 mA | 15 V DC at 2.5 mA |
| Input current | ||
| ● for signal “0”, max. (permissible quiescent current) | 1 mA | 1 mA |
| ● for signal “1”, min. | 2.5 mA | 2.5 mA |
| ● for signal “1”, typ. | 4 mA | 4 mA |
| Input delay (for rated value of input voltage) | ||
| for standard inputs | ||
| — parameterizable | Yes; 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms and 12.8 ms, selectable in groups of four | Yes; 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms and 12.8 ms, selectable in groups of four |
| for interrupt inputs | ||
| — parameterizable | Yes | Yes |
| Cable length | ||
| ● shielded, max. | 500 m | 500 m |
| ● unshielded, max. | 300 m | 300 m |
| Interrupts/diagnostics/status information | ||
| Alarms | ||
| ● Diagnostic alarm | Yes | Yes |
| Diagnostics indication LED | ||
| ● for status of the inputs | Yes | Yes |
| Potential separation | ||
| Potential separation digital inputs | ||
| ● between the channels, in groups of | 2 | 4 |
| Degree and class of protection | ||
| IP degree of protection | IP20 | IP20 |
| Standards, approvals, certificates | ||
| CE mark | Yes | Yes |
| CSA approval | Yes | Yes |
| UL approval | Yes | Yes |
| cULus | Yes | Yes |
| FM approval | Yes | Yes |
| RCM (formerly C-TICK) | Yes | Yes |
| KC approval | Yes | Yes |
| Marine approval | Yes | Yes |
| Ambient conditions | ||
| Free fall | ||
| ● Fall height, max. | 0.3 m; five times, in product package | 0.3 m; five times, in product package |
| Ambient temperature during operation | ||
| ● min. | -20 °C | -20 °C |
| ● max. | 60 °C | 60 °C |
| ● horizontal installation, min. | -20 °C | |
| ● horizontal installation, max. | 60 °C | |
| ● vertical installation, min. | -20 °C | |
| ● vertical installation, max. | 50 °C | |
| ● permissible temperature change | 5°C to 55°C, 3°C / minute | 5°C to 55°C, 3°C / minute |
| Ambient temperature during storage/transportation | ||
| ● min. | -40 °C | -40 °C |
| ● max. | 70 °C | 70 °C |
| Air pressure acc. to IEC 60068-2-13 | ||
| ● Storage/transport, min. | 660 hPa | 660 hPa |
| ● Storage/transport, max. | 1 080 hPa | 1 080 hPa |
| Relative humidity | ||
| ● Operation at 25 ℃ without condensation, max. | 95 % | 95 % |
| connection method / header | ||
| required front connector | Yes | Yes |
| Mechanics/material | ||
| Enclosure material (front) | ||
| ● Plastic | Yes | Yes |
| Dimensions | ||
| Width | 45 mm | 45 mm |
| Height | 100 mm | 100 mm |
| Depth | 75 mm | 75 mm |
| Weights | ||
| Weight, approx. | 170 g | 210 g |
