Product Overview
Technical Summary
| Product type designation | SM 1221, DI 16x 24 V DC |
|---|---|
| Digital inputs | 16 |
| Input voltage, rated value | 24 V DC |
| Signal "0" | 5 V DC or 0.5 mA |
| Signal "1" | 15 V DC at 2.5 mA |
| Input grouping | In groups of 4 |
| Standard input parameterization | 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 |
| Product lifecycle | Active Product |
Key Features
- Product type designation: SM 1221, DI 16x 24 V DC.
- Digital inputs: 16 digital inputs, in groups of 4.
- Input voltage: Rated value: 24 V DC; signal "0": 5 V DC or 0.5 mA; signal "1": 15 V DC at 2.5 mA.
- Parameterizable standard inputs: 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.
- Cable length: Shielded, max. 500 m; unshielded, max. 300 m.
- Protection and isolation: IP20; isolation between the channels and backplane bus: 707 V DC (type test).
Frequently Asked Questions
Which Siemens product does 6ES7221-1BH50-0XB0 identify?
It identifies a SIMATIC S7-1200 G2 SM 1221 digital input module with product type designation SM 1221, DI 16x 24 V DC.
Which specifications distinguish this SM 1221 variant?
It has 16 digital inputs, 24 V DC rated input voltage, inputs grouped in groups of 4, and parameterizable standard inputs with selectable times from 0.2 ms to 12.8 ms.
What should be checked when verifying the order number?
Check the complete 6ES7221-1BH50-0XB0 code together with the product type designation and the 16 DI, 24 V DC configuration.
What information is needed for a quotation request?
Provide the required quantity and destination together with the complete 6ES7221-1BH50-0XB0 order number.
