$ 141.68 $ 214.13Price range: $ 141.68 through $ 214.13
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 |
