Key Features
- 8 digital inputs: Number of digital inputs: 8.
- 24 V DC input module: Input voltage rated value (DC): 24 V.
- Sink/Source input design: Digital input type: Sink/Source.
- Diagnostics and status indication: Diagnostic alarm: Yes. Diagnostics indication LED for status of the inputs: Yes.
- Selectable input parameterization: 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.
- IP20 protection: Degree of protection: IP20.
Applications
- 24 V DC signal acquisition: Acquires 24 V DC digital input signals for a SIMATIC S7-1200 controller.
- Interrupt input monitoring: Supports interrupt input handling with diagnostic alarm and input status indication.
Technical Summary
| Product type designation | SM 1221, DI 8×24 V DC |
|---|---|
| Number of digital inputs | 8 |
| Input voltage rated value (DC) | 24 V |
| Supply voltage permissible range, lower limit (DC) | 20.4 V |
| Supply voltage 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 |
| Power supply to the transmitters | Yes |
| Power loss, typ. | 1.5 W |
| 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 |
| IP degree of protection | IP20 |
Frequently Asked Questions
What is the Siemens 6ES7221-1BF32-0XB0?
It is an SM 1221 digital input module for SIMATIC S7-1200.
How many digital inputs does the 6ES7221-1BF32-0XB0 provide?
It provides 8 digital inputs.
What input voltage does the SM 1221 DI 8×24 V DC use?
The input voltage rated value is 24 V DC.
Does the 6ES7221-1BF32-0XB0 support diagnostics?
Yes. It includes diagnostic alarm and a diagnostics indication LED for input status.
