Product Overview
Technical Summary
| Product designation | SIMATIC S7-300 SM 321 digital input module |
|---|---|
| Digital inputs | 16 |
| Input voltage | 120/230 V AC (47 … 63 Hz) |
| Signal "0" | 0 to 40V |
| Signal "1" | 79 to 264V |
| Front connector | 20-pin |
| Backplane bus input current, max. | 29 mA |
| Power loss, typ. | 4.9 W |
Key Features
- Product designation: SIMATIC S7-300 SM 321 digital input module; spare part.
- Digital inputs: 16 digital inputs with an IEC 61131 type 1 input characteristic curve.
- Input voltage: AC input voltage; rated value 230 V and 120/230 V AC at 47 … 63 Hz.
- Signal thresholds: Signal "0": 0 to 40V; signal "1": 79 to 264V.
- Electrical separation: Digital inputs have no separation between channels; separation from the backplane bus is provided by an optocoupler. Separation is in groups of 4.
- Connection and dimensions: Required front connector: 20-pin. Dimensions: 40 mm width, 125 mm height, and 120 mm depth.
Frequently Asked Questions
Which product does Siemens order number 6ES7321-1FH00-0AA0 identify?
It identifies a SIMATIC S7-300 SM 321 digital input module with 16 isolated digital inputs, 120/230 V AC input voltage, and a 20-pin front connector.
Which specifications distinguish this 6ES7321-1FH00-0AA0 variant?
The supplied specifications include 16 digital inputs, 120/230 V AC at 47 … 63 Hz, signal "0" from 0 to 40V, signal "1" from 79 to 264V, and no parameterization for standard inputs.
What code and nameplate details should be checked before inquiry?
Check the complete order number 6ES7321-1FH00-0AA0, the SIMATIC S7-300 SM 321 designation, the 16-input configuration, the 120/230 V AC rating, and the required 20-pin front connector.
What quantity and destination are needed for a quotation?
Provide the required quantity and destination together with the complete order number for quotation review.
