Product information
Overview
Key Features
- 16 isolated digital inputs: The SM 321 module has 16 digital inputs with an IEC 61131 type 1 input characteristic.
- 24 V DC input: Rated load and input voltage are 24 V DC; the permissible load-voltage range is 20.4 V to 28.8 V.
- Sourcing input: The product description identifies the module as a sourcing-input version.
- Electrical separation: Digital inputs are electrically separated from the backplane bus by an optocoupler; channels are not separated from one another and are in groups of 16.
- 20-pin connection: A 20-pin front connector is required. Cable length is max. 1 000 m with shielded cable and max. 600 m with unshielded cable.
- Product lifecycle: The item is identified as a spare part and has Product cancellation status.
Technical Summary
| Product type | SIMATIC S7-300 SM 321 digital input module |
|---|---|
| Digital inputs | 16 isolated DI |
| Rated input voltage | 24 V DC |
| Permissible load-voltage range | 20.4 V to 28.8 V |
| Input type | Sourcing input |
| Input characteristic | IEC 61131, type 1 |
| Input signal "0" | -5 to +30V |
| Input signal "1" | -13 to -30V |
| Front connector | 20-pin |
| Backplane-bus input current | 10 mA max. from 5 V DC |
Frequently Asked Questions
What is the exact Siemens model and input capacity?
It is Siemens 6ES7321-1BH50-0AA0, a SIMATIC S7-300 SM 321 module with 16 isolated digital inputs.
What voltage does the module use?
The rated input and load voltage is 24 V DC. The permissible load-voltage range is 20.4 V to 28.8 V.
What connector is required?
A 20-pin front connector is required.
Are the digital inputs separated from the backplane bus?
Yes. The digital inputs are separated from the backplane bus by an optocoupler, while the channels are not separated from one another and are in groups of 16.
How can I request a quotation for this configuration?
Send the required quantity, destination and project-list context for a model-specific quotation.
