Key Features
- Digital input module: SM 1221, DI 8×24 V DC.
- 8 digital inputs: Number of digital inputs: 8, in groups of 2.
- 24 V DC supply: Rated value (DC): 24 V; permissible range, lower limit (DC): 20.4 V; permissible range, upper limit (DC): 28.8 V.
- Input characteristic: Input characteristic curve in accordance with IEC 61131, type 1: Yes.
- Conformal coating: Conformal coating for high reliability.
- Temperature range: -40…+70 °C, with start up -25 °C.
Applications
- Digital signal acquisition for an S7-1200 controller: Use as an 8-channel 24 V DC digital input module in a SIMATIC S7-1200 system.
Technical Summary
| Product type designation | SM 1221, DI 8×24 V DC |
|---|---|
| Based on | 6ES7221-1BF32-0XB0 |
| Number of digital inputs | 8 |
| Rated value (DC) | 24 V |
| Permissible range, lower limit (DC) | 20.4 V |
| Permissible range, upper limit (DC) | 28.8 V |
| Input current from backplane bus 5 V DC, max. | 105 mA |
| Power loss, typ. | 1.5 W |
| Input characteristic curve in accordance with IEC 61131, type 1 | Yes |
| Diagnostics function | Yes |
| IP degree of protection | IP20 |
Frequently Asked Questions
What is Siemens 6AG1221-1BF32-2XB0?
It is a SIPLUS S7-1200 SM 1221 digital input module, SM 1221, DI 8×24 V DC.
How many digital inputs does 6AG1221-1BF32-2XB0 provide?
It provides 8 digital inputs, arranged in groups of 2.
What supply voltage does the module use?
Rated value (DC): 24 V, with a permissible range of 20.4 V to 28.8 V.
What installation and environmental details are listed for this module?
It requires a front connector, has a plastic front enclosure, and is specified for -40…+70 °C with start up -25 °C.
