Product Overview
Technical Summary
| Product function | Digital input SM 321 with 16 isolated digital inputs |
|---|---|
| Rated input voltage | 230 V; 120/230 V AC (47 … 63 Hz) |
| Input type | AC |
| Signal "0" input voltage | 0 to 40V |
| Signal "1" input voltage | 79 to 264V |
| Front connector | 20-pin |
| Electrical separation | Between inputs and backplane bus; optocoupler |
| Channel separation | In groups of 4 |
Key Features
16 isolated digital inputs with an IEC 61131 type 1 input characteristic curve.
Rated input voltage: 230 V; 120/230 V AC (47 … 63 Hz).
Signal "0": 0 to 40V; signal "1": 79 to 264V.
Requires a 20-pin front connector; dimensions are 40 mm wide, 125 mm high, and 120 mm deep.
Inputs are electrically separated from the backplane bus by an optocoupler; channel separation is in groups of 4.
Product cancellation. PDF weight is approximately 240 g; collected net weight is 0.288 kg.
Frequently Asked Questions
What is the exact Siemens line item?
The exact line item is 6ES7321-1FH00-0AA0, SIMATIC S7-300 digital input SM 321.
What input voltage does this module use?
It uses AC input voltage rated at 230 V; 120/230 V AC (47 … 63 Hz).
How many digital inputs are provided?
The module provides 16 isolated digital inputs.
What front connector is required?
A 20-pin front connector is required.
What project details should be included with a quotation request?
Include the requested quantity, destination, schedule context, and any additional BOM lines.
