Product information
Overview
Key Features
- Digital input capacity: 16 digital inputs, arranged in groups of 4.
- 24 V DC input signals: Rated input voltage is 24 V DC; signal "0" is 5 V DC at 1 mA, and signal "1" is 15 V DC at 2.5 mA.
- Sink/Source input design: The product description identifies Sink/Source digital inputs.
- Parameterizable input response: Standard inputs support selectable response times of 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms and 12.8 ms in groups of four.
- Diagnostics and protection: Diagnostic alarm and input-status LED indication are supported; protection degree is IP20.
- Cable length limits: Maximum cable length is 500 m for shielded cable and 300 m for unshielded cable.
Technical Summary
| Product type | SM 1221, DI 16×24 V DC |
|---|---|
| Digital inputs | 16, in groups of 4 |
| Rated supply voltage | 24 V |
| Permissible supply voltage | 20.4 V to 28.8 V |
| Input signal levels | Signal "0": 5 V DC at 1 mA; signal "1": 15 V DC at 2.5 mA |
| Input response times | 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms and 12.8 ms, selectable in groups of four |
| Protection degree | IP20 |
Frequently Asked Questions
What is the exact product type of Siemens 6ES7221-1BH32-0XB0?
It has the product type designation SM 1221, DI 16×24 V DC.
How many digital inputs does the SM 1221 module have?
It has 16 digital inputs in groups of 4.
What supply and input voltage does this module use?
The rated supply and input voltage is 24 V DC. The permissible supply voltage range is 20.4 V to 28.8 V.
What cable lengths are supported?
The maximum cable length is 500 m for shielded cable and 300 m for unshielded cable.
How should I request a quotation for this exact module?
Send the required quantity, destination and any project-list context for quotation review.
