Product Description
Key Features
- Exact module identity: SIMATIC S7-300 digital input SM 321, isolated, with 16 digital inputs.
- Input supply: Rated load voltage: 48 V DC; permissible range: 48 V to 125 V DC.
- Digital input signals: Signal "0": -146 V DC to +15 V DC; signal "1": 30 V DC to 146 V DC.
- Connector and dimensions: Required front connector: 20-pin. Dimensions: 40 mm width, 125 mm height and 120 mm depth.
- Channel isolation: Digital inputs are not separated between channels; separation between the channels and backplane bus uses an optocoupler. The channels are grouped in groups of 8.
- Diagnostics and lifecycle: The digital input status indicator is green. Alarms, diagnostics function, diagnostic alarm, hardware interrupt and group error SF indication are not available. Lifecycle: Product cancellation.
Technical Summary
| Product type | SIMATIC S7-300 digital input SM 321 |
|---|---|
| Digital inputs | 16 |
| Input voltage | 48 V DC to 125 V DC |
| Signal "0" | -146 V DC to +15 V DC |
| Signal "1" | 30 V DC to 146 V DC |
| Required front connector | 20-pin |
| Isolation | Between digital inputs and backplane bus: Yes; Optocoupler |
Frequently Asked Questions
What is the exact Siemens model?
It is the Siemens 6ES7321-1CH20-0AA0, a SIMATIC S7-300 digital input SM 321.
What input voltage does this module use?
The input voltage is DC, with a rated value of 48 V DC to 125 V DC.
Which connector is required?
It requires a 20-pin front connector.
Does it provide alarms or diagnostics?
It is without alarms, diagnostics function, diagnostic alarm and hardware interrupt.
