Key Features
- Digital input module: SM 1221, DI 16×24 V DC with 16 digital inputs in groups of 4.
- Electrical input data: Rated value (DC): 24 V; permissible range: 20.4 V to 28.8 V.
- Signal and input behavior: Input voltage for signal "0": 5 V DC at 1 mA; input voltage for signal "1": 15 V DC at 2.5 mA; input characteristic curve in accordance with IEC 61131, type 1: Yes.
- Diagnostics and interrupt inputs: Parameterizable interrupt inputs: Yes; diagnostic alarm: Yes; diagnostics indication LED for status of the inputs: Yes.
- Ruggedized design: Conformal coating: Yes; ambient temperature during operation: -40 °C to 70 °C; start-up @ -25 °C.
- Installation data: Required front connector: Yes; dimensions: Width 45 mm, Height 100 mm, Depth 75 mm; Weight, approx. 210 g.
Applications
- 24 V DC digital input acquisition: For reading 24 V DC digital input signals on 16 channels.
Technical Summary
| Product type designation | SM 1221, DI 16×24 V DC |
|---|---|
| based on | 6ES7221-1BH32-0XB0 |
| Number of digital inputs | 16 |
| Digital inputs in groups of | 4 |
| 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. | 130 mA |
| Power loss, typ. | 2.5 W |
| Input characteristic curve in accordance with IEC 61131, type 1 | Yes |
| Parameterizable interrupt inputs | Yes; 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms and 12.8 ms, selectable in groups of four |
| Diagnostic alarm | Yes |
| Diagnostics indication LED for status of the inputs | Yes |
| Ambient temperature during operation | -40 °C; = Tmin (incl. condensation/frost); start-up @ -25 °C |
| Ambient temperature during operation max. | 70 °C; = Tmax; Tmax > +60 °C number of simultaneously activated inputs 8 (no adjacent points) for horizontal mounting position |
| IP degree of protection | IP20 |
| Required front connector | Yes |
Frequently Asked Questions
What is the Siemens 6AG1221-1BH32-2XB0?
It is a SIPLUS S7-1200 SM 1221 digital input module, SM 1221, DI 16×24 V DC.
How many inputs does this module provide?
It provides 16 digital inputs, arranged in groups of 4.
What supply and input values are specified for this module?
Rated value (DC): 24 V; permissible range: 20.4 V to 28.8 V; input voltage for signal "0": 5 V DC at 1 mA; input voltage for signal "1": 15 V DC at 2.5 mA.
What installation and environmental data are specified?
A required front connector is specified. Dimensions are Width 45 mm, Height 100 mm, Depth 75 mm, and the ambient operating range is -40 °C to 70 °C with start-up @ -25 °C.
