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.
- 120/230 V AC input: Input voltage is AC with a rated value of 230 V; 120/230 V AC (47 … 63 Hz).
- Input signal ranges: Signal "0" is 0 to 40V and signal "1" is 79 to 264V.
- Electrical isolation: The digital inputs are isolated from the backplane bus by an optocoupler and tested with 4 000 V DC.
- 20-pin front connection: A 20-pin front connector is required.
- Shielded and unshielded cable limits: Maximum cable length is 1 000 m for shielded cable and 600 m for unshielded cable.
Technical Summary
| Product type | SIMATIC S7-300 SM 321 digital input module |
|---|---|
| Digital inputs | 16 |
| Input voltage | AC; rated value 230 V; 120/230 V AC (47 … 63 Hz) |
| Signal "0" | 0 to 40V |
| Signal "1" | 79 to 264V |
| Input current for signal "1" | 6.5 mA typ. (120 V, 60 Hz), 16 mA (230 V, 50 Hz) |
| Backplane bus input current | 5 V DC, 29 mA max. |
| Required front connector | 20-pin |
| Isolation | Between digital inputs and backplane bus; optocoupler |
| Lifecycle | Product cancellation |
Frequently Asked Questions
What is the exact Siemens model and module type?
It is the Siemens 6ES7321-1FH00-0AA0 SIMATIC S7-300 SM 321 digital input module.
What input voltage does the module use?
The input voltage is AC, with a rated value of 230 V; 120/230 V AC (47 … 63 Hz).
What connector is required?
A 20-pin front connector is required.
What cable lengths are supported?
The maximum length is 1 000 m for shielded cable and 600 m for unshielded cable.
How can I request a quotation for a project?
Send the required quantity, destination, and project-list context for an MRO or project quotation.
