Technical Summary
| Product type designation | SM 1221, DI 8×24 V DC |
|---|---|
| Based on | 6ES7221-1BF32-0XB0 |
| Number of digital inputs | 8 |
| Digital inputs in groups of | 2 |
| Rated value (DC) | 24 V |
| permissible range, lower limit (DC) | 20.4 V |
| permissible range, upper limit (DC) | 28.8 V |
| Power loss, typ. | 1.5 W |
| Ambient temperature during operation min. | -20 °C; = Tmin (incl. condensation/frost); start-up @ 0 °C |
| Ambient temperature during operation max. | 60 °C; = Tmax |
| IP degree of protection | IP20 |
| Conformal coating | Yes; Conformal coating, Class A |
Key Features
8 digital inputs
Digital input module with 8 DI in groups of 2.
Digital input module with 8 DI in groups of 2.
24 V DC input rating
Rated value (DC): 24 V with sink/source input behavior.
Rated value (DC): 24 V with sink/source input behavior.
Conformal coating
Supplied with conformal coating for the SIPLUS variant.
Supplied with conformal coating for the SIPLUS variant.
Wide operating temperature range
Ambient temperature during operation: -20 °C to 60 °C.
Ambient temperature during operation: -20 °C to 60 °C.
Required front connector
Connection method requires a front connector.
Connection method requires a front connector.
Compact enclosure
Width 45 mm, height 100 mm, depth 75 mm.
Width 45 mm, height 100 mm, depth 75 mm.
Applications
Digital input signal acquisition
Used for acquiring 8 digital input signals at 24 V DC.
Used for acquiring 8 digital input signals at 24 V DC.
Interrupt input monitoring
Used for interrupt inputs with diagnostics function, diagnostic alarm, and input status indication.
Used for interrupt inputs with diagnostics function, diagnostic alarm, and input status indication.
Frequently Asked Questions
What is the exact product type of Siemens 6AG1221-1BF32-4XB0?
It is an SM 1221, DI 8×24 V DC SIPLUS S7-1200 digital input module.
How many digital inputs does 6AG1221-1BF32-4XB0 have?
It has 8 digital inputs, arranged in groups of 2.
What is the input voltage for this SM 1221 module?
Rated input value is 24 V DC, with a permissible range from 20.4 V to 28.8 V.
What temperature range does the SIPLUS variant support?
Ambient temperature during operation is -20 °C to 60 °C.
Does this module require a front connector?
Yes. The required front connector is specified for the connection method.
