Product information
Overview
Key Features
- Digital input capacity: The SM 321 module has 16 digital inputs.
- Input voltage: Input voltage is DC, with a rated value of 24 V; signal "0" is -30 to +5 V and signal "1" is 13 to 30V.
- Load voltage: Load voltage L+ has a rated value of 24 V and a permissible range of 20.4 V to 28.8 V.
- Electrical isolation: The digital inputs are isolated from the backplane bus by an optocoupler; the channels are not separated from each other.
- Connection and installation: The required front connector is 20-pin. Dimensions are 40 mm wide, 125 mm high, and 120 mm deep.
Technical Summary
| Product type | SIMATIC S7-300 SM 321 digital input module |
|---|---|
| Product status | Product cancellation; spare part |
| Digital inputs | 16 |
| Input voltage | DC; rated value 24 V |
| Load voltage L+ | Rated value 24 V; permissible range 20.4 V to 28.8 V |
| Front connector | 20-pin |
| Backplane bus isolation | Yes; optocoupler |
| Channel separation | No; in groups of 16 |
| Power loss | 3.5 W, typical |
Frequently Asked Questions
What is the exact product and configuration?
It is Siemens 6ES7321-1BH02-0AA0, a SIMATIC S7-300 SM 321 isolated digital input module with 16 DI, 24 V DC, and 1x 20-pole configuration.
What connector does the module require?
It requires a 20-pin front connector.
What input voltage does it use?
The input voltage is DC with a rated value of 24 V. Signal "0" is -30 to +5 V, and signal "1" is 13 to 30V.
Is the product available as a current product?
It is identified as a spare part with product cancellation status. Request a quotation with quantity and destination for configuration verification.
