Product Description
Key Features
- Exact module identity: Product type designation: SM 1221, DI 16×24 V DC.
- Digital input capacity: 16 digital inputs, arranged in groups of 4.
- Supply voltage: Rated supply voltage: 24 V DC; permissible range: 20.4 V to 28.8 V DC.
- Input signal levels: Signal "0": 5 V DC at 1 mA; signal "1": 15 V DC at 2.5 mA.
- Parameterizable inputs: Standard input delay is selectable in groups of four: 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms and 12.8 ms.
- Protection and diagnostics: IP20 protection, diagnostic alarm, and input-status LED indication.
Technical Summary
| Product type designation | SM 1221, DI 16×24 V DC |
|---|---|
| Digital inputs | 16; in groups of 4 |
| Rated supply voltage | 24 V DC |
| Permissible supply voltage | 20.4 V to 28.8 V DC |
| Signal "0" input voltage | 5 V DC at 1 mA |
| Signal "1" input voltage | 15 V DC at 2.5 mA |
| Standard input delay | 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 |
| Protection | IP20 |
Frequently Asked Questions
What is the exact order number and module type?
The order number is 6ES7221-1BH32-0XB0, and the product type designation is SM 1221, DI 16×24 V DC.
How many digital inputs does the module have?
It has 16 digital inputs arranged in groups of 4.
What supply voltage does it use?
The rated supply voltage is 24 V DC, with a permissible range of 20.4 V to 28.8 V DC.
What cable lengths are supported?
The maximum cable length is 500 m for shielded cable and 300 m for unshielded cable.
