Product information
Overview
Key Features
- Digital input capacity: 8 digital inputs arranged in groups of 2.
- Supply voltage: Rated supply voltage: 24 V DC; permissible range: 20.4 V to 28.8 V.
- Input signals: Signal "0": 5 V DC at 1 mA; signal "1": 15 V DC at 2.5 mA.
- Configurable input delay: Standard inputs support selectable delays of 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.
- Interrupt inputs and diagnostics: Interrupt inputs are parameterizable and include diagnostic alarms and input-status LED indication.
- Protection and cable length: IP20 protection; maximum cable length is 500 m shielded or 300 m unshielded for interrupt inputs.
Technical Summary
| Product type | SM 1221, DI 8×24 V DC |
|---|---|
| Digital inputs | 8; in groups of 2 |
| Rated supply voltage | 24 V DC |
| Permissible supply voltage | 20.4 V to 28.8 V DC |
| Signal thresholds | Signal "0": 5 V DC at 1 mA; signal "1": 15 V DC at 2.5 mA |
| 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 |
| Interrupt inputs | Parameterizable; diagnostic alarm and input-status LED indication |
| Protection | IP20 |
Frequently Asked Questions
What is the exact product type of Siemens 6ES7221-1BF32-0XB0?
It has product type designation SM 1221, DI 8×24 V DC.
What supply voltage does the SM 1221 digital input module use?
Its rated supply voltage is 24 V DC, with a permissible range of 20.4 V to 28.8 V.
How are the 8 digital inputs configured?
The module has 8 digital inputs arranged in groups of 2.
Can the standard input delay be configured?
Yes. Selectable delays are 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms and 12.8 ms, in groups of four.
What configuration details should be included in a quotation request?
Include the required quantity, destination, and project-list context for verification.
