Product Overview
Technical Summary
| Parameter | Value |
|---|---|
| Product type | SM 1221, DI 8×24 V DC |
| Digital inputs | 8 |
| Input grouping | In groups of 2 |
| Rated input voltage | 24 V DC |
| Signal 0 | 5 V DC at 1 mA |
| Signal 1 | 15 V DC at 2.5 mA |
| Supply voltage | 24 V; permissible range 20.4 V to 28.8 V |
| 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 |
| Backplane bus current | 105 mA max. from backplane bus 5 V DC |
| Power loss | 1.5 W, typ. |
| IP degree of protection | IP20 |
Key Features
- Digital input module: Product type designation: SM 1221, DI 8×24 V DC.
- 8 digital inputs: The module has 8 digital inputs in groups of 2.
- 24 V DC input signals: Rated input voltage is 24 V DC; signal 0 is 5 V DC at 1 mA and signal 1 is 15 V DC at 2.5 mA.
- Parameterizable input delays: 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 in groups of four.
- Supply and power loss: Rated supply voltage is 24 V, with a permissible range of 20.4 V to 28.8 V. Typical power loss is 1.5 W.
- Interrupt diagnostics and protection: Interrupt inputs have diagnostic alarms and input-status LEDs. Protection rating is IP20.
Frequently Asked Questions
1. What is the I/O type and channel count of Siemens 6ES7221-1BF32-0XB0?
It is an SM 1221 digital input module with 8 DI, arranged in groups of 2.
2. What input signals does 6ES7221-1BF32-0XB0 support?
The rated input voltage is 24 V DC. Signal 0 is 5 V DC at 1 mA, and signal 1 is 15 V DC at 2.5 mA.
3. Are the input delays parameterizable?
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.
4. What supply voltage is required?
The rated supply voltage is 24 V, with a permissible range of 20.4 V to 28.8 V.
5. What diagnostics and protection details should be verified before inquiry?
Interrupt inputs have diagnostic alarms and input-status LEDs, and the degree of protection is IP20.
