Key Features
- 16 digital inputs: Provides 16 DI for SIMATIC S7-1200 I/O expansion.
- 24 V DC input rating: Supports a rated value of 24 V for the digital inputs.
- Sink/Source: Configured for Sink/Source input wiring.
- Diagnostic alarm: Diagnostic alarm: Yes.
- Input status LED: Diagnostics indication LED for the status of the inputs: Yes.
Applications
- Digital input expansion for SIMATIC S7-1200: Adds 16 digital inputs to a SIMATIC S7-1200 controller.
- 24 V DC signal acquisition: Receives 24 V DC digital input signals from field devices.
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 |
| Supply voltage, permissible range, lower limit (DC) | 20.4 V |
| Supply voltage, permissible 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 |
Frequently Asked Questions
What is the Siemens 6ES7221-1BH32-0XB0 module used for?
It is a SIMATIC S7-1200 SM 1221 digital input module with 16 DI at 24 V DC.
How many digital inputs does SM 1221, DI 16×24 V DC provide?
It provides 16 digital inputs.
What input voltage does this module use?
The rated input voltage is 24 V DC, with a permissible range from 20.4 V to 28.8 V.
Does the module support diagnostic indication?
Yes. It has a diagnostic alarm and an input status LED.
What wiring type is supported by this digital input module?
It supports Sink/Source input wiring.
