Product Overview
Technical Summary
| Parameter | Value |
|---|---|
| Module type | SB 1221, DI 4×5 V DC 200 kHz |
| Digital inputs | 4; Current-sourcing |
| Rated input voltage | 5 V DC |
| Input signal 0 | (L+ minus 1.0 V DC) … L+ (2.2 … 0 mA) |
| Input signal 1 | 0 V … (L+ minus 2.0 V DC (20 … 5.1 mA)) |
| Standard input timing | 0.1 / 0.2 / 0.4 / 0.8 / 1.6 / 3.2 / 6.4 / 10.0 / 12.8 / 20.0 μs; 0.05 / 0.1 / 0.2 / 0.4 / 0.8 / 1.6 / 3.2 / 6.4 / 10.0 / 12.8 / 20.0 ms |
| Input-status LED | Yes |
| Backplane-bus input current | 40 mA at 5 V DC |
| Power loss | 1 W |
Key Features
- Digital input type and channels: SB 1221 has 4 current-sourcing digital inputs, arranged in groups of 4.
- Rated input voltage: Rated input voltage: 5 V DC.
- Input signal ranges: Signal 0: (L+ minus 1.0 V DC) … L+ with 2.2 … 0 mA. Signal 1: 0 V … (L+ minus 2.0 V DC) with 20 … 5.1 mA.
- Parameterizable input timing: Standard inputs support parameterizable timing from 0.1 μs to 20.0 μs and from 0.05 ms to 20.0 ms. Interrupt inputs and technological functions are parameterizable.
- Cable and diagnostics: Maximum shielded cable length: 50 m with shielded, twisted pair. An LED indicates input status.
- Electrical consumption: Typical backplane-bus input current: 40 mA at 5 V DC. Typical power loss: 1 W.
Frequently Asked Questions
1. How many digital inputs does Siemens 6ES7221-3AD30-0XB0 have?
It has 4 current-sourcing digital inputs, arranged in groups of 4.
2. What input voltage does the SB 1221 use?
The rated input voltage is 5 V DC. Signal 0 is (L+ minus 1.0 V DC) … L+, and signal 1 is 0 V … (L+ minus 2.0 V DC).
3. What input timing can be parameterized?
Standard inputs support 0.1 / 0.2 / 0.4 / 0.8 / 1.6 / 3.2 / 6.4 / 10.0 / 12.8 / 20.0 μs and 0.05 / 0.1 / 0.2 / 0.4 / 0.8 / 1.6 / 3.2 / 6.4 / 10.0 / 12.8 / 20.0 ms.
4. Does the module provide input-status diagnostics?
Yes. An LED indicates the status of the inputs.
