Product Overview
Technical Summary
| Product type | SIMATIC S7-300 SM 321 digital input module |
|---|---|
| Digital inputs | 16 |
| Input voltage | 24 V DC rated value |
| Load voltage L+ | 24 V rated value; permissible range 20.4 V to 28.8 V DC |
| Input current for signal "1" | 7 mA, typ. |
| Front connector | 20-pin required |
| Digital input isolation | Between channels and backplane bus: Yes; Optocoupler; between channels: No |
Key Features
16 digital inputs with an input characteristic curve in accordance with IEC 61131, type 1.
Input voltage rated value: 24 V; signal "0": -30 to +5 V; signal "1": 13 to 30V.
Digital inputs are isolated from the backplane bus by an optocoupler; channels are not separated from each other.
Required front connector: 20-pin; connection description: 1x 20-pole.
Maximum cable length is 1 000 m for shielded cable and 600 m for unshielded cable.
Product cancellation.
Frequently Asked Questions
What is the exact product line item?
It is 6ES7321-1BH02-0AA0, a Siemens SIMATIC S7-300 SM 321 digital input module with 16 isolated DI and 24 V DC input.
What supply and input-voltage values apply?
The load voltage L+ has a 24 V rated value with a permissible range of 20.4 V to 28.8 V DC. The input voltage rated value is 24 V; signal "0" is -30 to +5 V and signal "1" is 13 to 30V.
Which front connector is required?
A 20-pin front connector is required; the connection description is 1x 20-pole.
Is the product supplied with a connector?
The source data specifies a required 20-pin front connector but does not state that it is included. Confirm the requested configuration, quantity, destination, schedule, and any additional BOM lines for a quotation.
