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SIMATIC S7-1200, DIGITAL INPUT SM 1221, 8DI, 24V DC, SINK/SOURCE INPUT |
| Supply voltage |
| 24 V DC |
Yes |
| 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. |
105 mA |
| Digital inputs |
| ● from load voltage L (without load), max. |
4 mA; per channel |
| Output voltage |
| Power supply to the transmitters |
| ● present |
Yes |
| Power losses |
| Power loss, typ. |
1.5 W |
| Digital inputs |
| Number of digital inputs |
8 |
| ● In groups of |
2 |
| Input characteristic curve in accordance with IEC 61131, type 1 |
Yes |
| Number of simultaneously controllable inputs |
| all mounting positions |
| — up to 40 °C, max. |
8 |
| horizontal installation |
| — up to 40 °C, max. |
8 |
| — up to 50 °C, max. |
8 |
| vertical installation |
| — up to 40 °C, max. |
8 |
| Input voltage |
| ● Type of input voltage |
DC |
| ● Rated value (DC) |
24 V |
| ● for signal "0" |
5 V DC at 1 mA |
| ● for signal "1" |
15 VDC at 2.5 mA |
| Input current |
| ● for signal "0", max. (permissible quiescent current) |
1 mA |
| ● for signal "1", min. |
2.5 mA |
| ● for signal "1", typ. |
4 mA; Typical |
| 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 |
| for interrupt inputs |
| — Parameterizable |
Yes |
| Cable length |
| ● Cable length, shielded, max. |
500 m |
| ● Cable length unshielded, max. |
300 m |
| Digital outputs |
| Number of digital outputs |
0 |
| short-circuit protection |
No |
| Interrupts/diagnostics/status information |
| Alarms |
| ● Alarms |
Yes |
| ● Diagnostic alarm |
Yes |
| Diagnostic messages |
| ● Diagnostic functions |
Yes |
| ● Monitoring the supply voltage |
Yes |
| Diagnostics indication LED |
| ● for status of the inputs |
Yes |
| ● for maintenance |
Yes |
| ● Status indicator digital input (green) |
Yes |
| Galvanic isolation |
| Galvanic isolation digital inputs |
| ● between the channels, in groups of |
2 |
| Degree and class of protection |
| Degree of protection to EN 60529 |
|
| ● IP20 |
Yes |
| Standards, approvals, certificates |
| CE mark |
Yes |
| RCM (formerly C-TICK) |
Yes |
| FM approval |
Yes |
| Climatic and mechanical conditions for storage and transport |
| Climatic conditions for storage and transport |
| Free fall |
| — Drop height, max. (in packaging) |
0.3 m; five times, in dispatch package |
| Temperature |
| — Permissible temperature range |
-40 °C to 70 °C |
| Air pressure acc. to IEC 60068-2-13 |
| — Permissible air pressure |
1080 to 660 hPa |
| Relative humidity |
| — Permissible range (without condensation) at 25 °C |
95 % |
| Mechanical and climatic conditions during operation |
| Climatic conditions in operation |
| Temperature |
| — Permissible temperature range |
-20 °C to 60 °C horizontal mounting, -20 °C to 50 °C vertical mounting, 95% humidity, non-condensing |
| — Permissible temperature change |
5°C to 55°C, 3°C / minute |
| Connection method |
| required front connector |
Yes |
| Mechanics/material |
| Type of housing (front) |
|
| ● plastic |
Yes |
| Dimensions |
| Width |
45 mm |
| Height |
100 mm |
| Depth |
75 mm |
| Weights |
| Weight, approx. |
170 g |
| last modified: |
13.10.2014 |
