Product Overview
Technical Summary
| Parameter | Value |
|---|---|
| Product type | SB 1221, DI 4×24 V DC 200 kHz |
| Digital inputs | 4; Current-sourcing |
| Rated input voltage | 24 V DC |
| Signal 0 input voltage | (L+ minus 5.0 V DC) … L+ (1.4 … 0 mA) |
| Signal 1 input voltage | 0 V … (L+ minus 10 V DC (10 … 2.9 mA)) |
| Signal 0 input current, max. | 1.4 mA |
| Signal 1 input current, min. | 2.9 mA |
| Signal 1 input current, typ. | 7 mA |
| Input status LED | Yes |
| Power loss, typ. | 1 W |
Applications
- Digital signal acquisition: Acquires digital signals through 4 current-sourcing inputs.
Key Features
- Digital input channels: 4 digital inputs, current-sourcing, arranged in groups of 4.
- Rated input voltage: Rated input voltage: 24 V DC.
- Input signal levels: Signal 0 input voltage: (L+ minus 5.0 V DC) … L+ (1.4 … 0 mA). Signal 1 input voltage: 0 V … (L+ minus 10 V DC (10 … 2.9 mA)).
- Input current: Signal 0 permissible quiescent current, max.: 1.4 mA. Signal 1 input current: 2.9 mA min., 7 mA typ.
- Parameterization and diagnostics: Standard, interrupt, and technological function inputs are parameterizable. Input status LED indication is provided.
- High-speed input and cable: The module has a 200 kHz input specification. Shielded twisted-pair cable length is 50 m max.
Frequently Asked Questions
1. How many digital inputs does the Siemens 6ES7221-3BD30-0XB0 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 24 V DC.
3. What are the signal 0 and signal 1 input ranges?
Signal 0 is (L+ minus 5.0 V DC) … L+ (1.4 … 0 mA). Signal 1 is 0 V … (L+ minus 10 V DC (10 … 2.9 mA)).
4. Does the module provide input diagnostics?
Yes. It provides an LED for input status indication.
