Key Features
- Digital input module: SIMATIC S7-300 digital input SM 321 with 16 DI.
- Input voltage: 48-125 V DC input voltage range.
- Isolation: Isolated digital inputs with potential separation between the channels and backplane bus via optocoupler.
- Connection method: Required front connector: 20-pin.
- Status indication: Status indicator digital input (green): Yes.
Applications
- 16-channel DC input acquisition: For connecting 16 DC digital input signals to an S7-300 system.
Technical Summary
| Product function | digital input SM 321 |
|---|---|
| Number of digital inputs | 16 |
| Input voltage | 48 V DC to 125 V DC |
| Type of input voltage | DC |
| Input current for signal "1", typ. | 3.5 mA |
| Potential separation between the channels and backplane bus | Yes; Optocoupler |
| Required front connector | 20-pin |
| Power loss, typ. | 4.3 W |
| Input current from backplane bus 5 V DC, max. | 40 mA |
Frequently Asked Questions
What is Siemens 6ES7321-1CH20-0AA0?
It is a SIMATIC S7-300 digital input SM 321 with 16 DI.
What input voltage range does 6ES7321-1CH20-0AA0 support?
The input voltage range is 48 V DC to 125 V DC.
How is the module connected?
It requires a 20-pin front connector.
Does this module provide isolation?
Yes. The digital inputs are isolated, and potential separation between the channels and backplane bus is provided via optocoupler.
