Technical Summary
| Product type designation | SM 1221, DI 16×24 V DC |
|---|---|
| Number of digital inputs | 16 |
| Rated value (DC) | 24 V |
| Supply voltage lower limit (DC) | 20.4 V |
| Supply voltage upper limit (DC) | 28.8 V |
| Input current from backplane bus 5 V DC, max. | 130 mA |
| Digital inputs from load voltage L+ (without load), max. | 4 mA; per channel |
| Power loss, typ. | 2.5 W |
| Input voltage for signal "0" | 5 V DC at 1 mA |
| Input voltage for signal "1" | 15 V DC at 2.5 mA |
Key Features
SIMATIC S7-1200 digital input module
SM 1221 digital input module for the SIMATIC S7-1200 series.
SM 1221 digital input module for the SIMATIC S7-1200 series.
16 digital inputs
Provides 16 DI for 24 V DC input handling.
Provides 16 DI for 24 V DC input handling.
Sink/Source design
Configured as Sink/Source for the supplied input concept.
Configured as Sink/Source for the supplied input concept.
Parameterizable input behavior
Standard inputs are parameterizable with selectable 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms and 12.8 ms.
Standard inputs are parameterizable with selectable 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms and 12.8 ms.
Interrupt input support
Interrupt inputs are parameterizable.
Interrupt inputs are parameterizable.
Diagnostic functions
Diagnostic alarm support and input status LED indication are available.
Diagnostic alarm support and input status LED indication are available.
Applications
24 V DC digital signal acquisition
Acquires 24 V DC digital signals through 16 input channels.
Acquires 24 V DC digital signals through 16 input channels.
Interrupt input handling
Supports interrupt input processing in a SIMATIC S7-1200 installation.
Supports interrupt input processing in a SIMATIC S7-1200 installation.
Frequently Asked Questions
What is the exact product type of 6ES7221-1BH32-0XB0?
It is an SM 1221, DI 16×24 V DC digital input module for SIMATIC S7-1200.
How many digital inputs does 6ES7221-1BH32-0XB0 have?
It has 16 digital inputs.
What is the rated input voltage for 6ES7221-1BH32-0XB0?
The rated value is 24 V DC.
What cable lengths are supported for this module?
Shielded cable length is up to 500 m and unshielded cable length is up to 300 m.
Does 6ES7221-1BH32-0XB0 provide diagnostics?
Yes. Diagnostic alarm support is available, and the inputs have a status LED indication.
