Product information
Overview
Key Features
- Digital input capacity: Has 16 digital inputs with an input characteristic curve according to IEC 61131, type 1.
- DC input voltage: Input voltage is 48 V; the stated range is 48 V DC to 125 V DC.
- Galvanic separation: Digital inputs are isolated from the backplane bus by an optocoupler; channels are not isolated from one another and are grouped in groups of 8.
- Signal thresholds: Signal "0" is -146 V DC to +15 V DC; signal "1" is 30 V DC to 146 V DC.
- Front connection: Requires a 20-pin front connector.
Technical Summary
| Product type | SM 321 isolated digital input module |
|---|---|
| Digital inputs | 16 |
| Input voltage | 48 V DC to 125 V DC |
| Load voltage L+, rated value | 48 V DC |
| Input current for signal "1", typ. | 3.5 mA |
| Backplane bus input current, max. | 40 mA |
| Power loss, typ. | 4.3 W |
| Front connector | 20-pin |
| Backplane bus isolation | Yes; optocoupler |
| Isochronous mode | No |
Frequently Asked Questions
What is the exact configuration of 6ES7321-1CH20-0AA0?
It is a SIMATIC S7-300 SM 321 isolated digital input module with 16 DI, 48–125 V DC input voltage, and a 20-pin front connector.
What input voltage does this module support?
The input voltage is 48 V DC to 125 V DC. Signal "0" is -146 V DC to +15 V DC, and signal "1" is 30 V DC to 146 V DC.
How are the digital inputs isolated?
The digital inputs are isolated from the backplane bus by an optocoupler. The channels are not isolated from one another and are grouped in groups of 8.
Can you quote this Siemens module for a project quantity and destination?
Send the required quantity, destination, and project-list context for a model-specific quotation.
