Key Features
- Digital input module: SM 1221 digital input module for SIMATIC S7-1200.
- Input configuration: 16 DI, 24 V DC, Sink/Source.
- Diagnostic functions: Diagnostic alarm: Yes.
- Input status indication: Diagnostics indication LED for status of the inputs: Yes.
Technical Summary
| Product type designation | SM 1221, DI 16×24 V DC |
|---|---|
| Number of digital inputs | 16 |
| Input voltage, rated value (DC) | 24 V |
| Supply voltage, rated value (DC) | 24 V |
| Permissible supply voltage range, lower limit (DC) | 20.4 V |
| Permissible supply voltage range, 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 characteristic curve in accordance with IEC 61131, type 1 | Yes |
| Diagnostic alarm | Yes |
| IP degree of protection | IP20 |
Applications
- 24 V DC digital signal input to a SIMATIC S7-1200 controller: Collects 24 V DC input signals as digital inputs for SIMATIC S7-1200 use.
Frequently Asked Questions
What is Siemens 6ES7221-1BH32-0XB0?
It is a SIMATIC S7-1200 SM 1221 digital input module.
How many digital inputs does 6ES7221-1BH32-0XB0 have?
It has 16 digital inputs.
What input voltage does the SM 1221 DI module use?
The rated input voltage is 24 V DC, with a permissible supply range of 20.4 V to 28.8 V DC.
Does 6ES7221-1BH32-0XB0 include diagnostics?
Yes. Diagnostic alarm is supported, and there is a diagnostics indication LED for input status.
