Key Features
- SIMATIC S7-300 digital input module: Digital input SM 321 with 8 DI for AC signal acquisition.
- AC input range: 120 V/230 V AC, with rated value (AC) 230 V; 120/230 V AC (47 … 63 Hz).
- Connection and isolation: 1x 20-pole required front connector and potential separation between the digital inputs and the backplane bus by optocoupler.
- Signal handling: Input voltage type: AC, with signal "0" at 0 to 40V and signal "1" at 79 to 264V.
- Installation and size: Width 40 mm, height 125 mm, depth 120 mm.
Applications
- AC digital input acquisition: Reading 120 V/230 V AC digital signals in a SIMATIC S7-300 system.
- 2-wire sensor connection: Connecting 2-wire sensors to the digital input channels.
Technical Summary
| Product function | Digital input SM 321 |
|---|---|
| Number of digital inputs | 8 |
| Input voltage type | AC |
| Rated value (AC) | 230 V; 120/230 V AC (47 … 63 Hz) |
| Input current for signal "1", typ. | 6.5 mA; (120 V); 11 mA (230 V) |
| Power loss, typ. | 4.9 W |
| Potential separation digital inputs and backplane bus | Yes; Optocoupler |
| Required front connector | 20-pin |
Frequently Asked Questions
What is Siemens 6ES7321-1FF01-0AA0 used for?
It is a SIMATIC S7-300 digital input SM 321 with 8 DI for AC signal acquisition.
How many digital inputs does 6ES7321-1FF01-0AA0 provide?
It provides 8 digital inputs.
What input voltage does the SM 321 support?
The module supports 120 V/230 V AC, with rated value (AC) 230 V; 120/230 V AC (47 … 63 Hz).
What connector is required for 6ES7321-1FF01-0AA0?
A 20-pin front connector is required.
Does the module have isolation between the inputs and the backplane bus?
Yes. The digital inputs are separated from the backplane bus by optocoupler.
