Key Features
- 16 digital inputs: SM 1221 digital input module with 16 DI.
- 24 V DC sink/source inputs: Inputs: 16x DI 24 V DC sink/source.
- Parameterizable input filtering: For standard inputs – parameterizable: 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.
- Diagnostics indication LEDs: Diagnostics indication LED for status of the inputs and for maintenance.
- IP20 protection: Degree of protection: IP20.
Applications
- SIMATIC S7-1200 G2 input expansion: Expands a SIMATIC S7-1200 G2 controller with 16 digital input channels.
- 24 V DC input signal acquisition: Collects 24 V DC sink/source input signals from connected devices.
Technical Summary
| Product type designation | SM 1221, DI 16x 24 V DC |
|---|---|
| Number of digital inputs | 16 |
| Input voltage, rated value (DC) | 24 V |
| Input characteristic curve | IEC 61131, type 1 |
| Input current for signal "0", max. (permissible quiescent current) | 0.5 mA |
| Input current for signal "1", min. | 2.5 mA |
| Input current from backplane bus 5 V DC, max. | 90 mA |
| Power loss, typ. | 3.2 W |
| Degree of protection | IP20 |
| Potential separation between the channels and backplane bus | Yes; 707 V DC (type test) |
Frequently Asked Questions
What is the Siemens 6ES7221-1BH50-0XB0?
It is an SM 1221 digital input module for SIMATIC S7-1200 G2 with 16 DI.
How many digital inputs does 6ES7221-1BH50-0XB0 provide?
It provides 16 digital inputs.
What input signal level does the module use?
The rated input voltage is 24 V DC, with inputs specified as 16x DI 24 V DC sink/source.
What installation or wiring details are important for selection?
The module supports cable lengths up to 500 m shielded and 300 m unshielded, and the digital inputs are grouped in 4.
