Key Features
- Digital input module: SIMATIC S7-1200 SM 1221 digital input module.
- 8 digital inputs: Provides 8 DI.
- 24 V DC supply and input rating: Designed for 24 V DC.
Technical Summary
| Product type designation | SM 1221, DI 8×24 V DC |
|---|---|
| Number of digital inputs | 8 |
| Rated value (DC) | 24 V |
| Input voltage for signal "0" | 5 V DC at 1 mA |
| Input voltage for signal "1" | 15 V DC at 2.5 mA |
| Input current from backplane bus 5 V DC, max. | 105 mA |
| Power loss, typ. | 1.5 W |
| Power supply to the transmitters | Yes |
| Input characteristic curve in accordance with IEC 61131, type 1 | Yes |
| Parameterizable standard inputs | 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 |
| Diagnostic alarm | Yes |
| IP degree of protection | IP20 |
Applications
- Digital signal acquisition: Acquires 24 V DC digital input signals through 8 DI.
Frequently Asked Questions
What is the exact Siemens model and module type of 6ES7221-1BF32-0XB0?
It is a SIMATIC S7-1200 digital input module, SM 1221, DI 8×24 V DC.
How many digital inputs does 6ES7221-1BF32-0XB0 provide?
It provides 8 digital inputs.
What is the supply voltage for 6ES7221-1BF32-0XB0?
The rated value is 24 V DC, with a permissible range from 20.4 V to 28.8 V.
What protection rating is listed for the module?
The IP degree of protection is IP20.
