Product Overview
Technical Summary
| Product type | SM 1221, DI 8×24 V DC |
|---|---|
| Digital inputs | 8, in groups of 2 |
| Rated input voltage | 24 V DC |
| Supply voltage range | 20.4 V to 28.8 V DC |
| Input configuration | Sink/Source |
| Protection | IP20 |
| Product lifecycle | Active Product |
Key Features
The SM 1221 has 8 digital inputs arranged in groups of 2.
The module has DI 8×24 V DC Sink/Source inputs. Rated input voltage is 24 V; signal 0 is 5 V DC at 1 mA, and signal 1 is 15 V DC at 2.5 mA.
Rated supply voltage is 24 V, with a permissible range from 20.4 V to 28.8 V DC.
Standard inputs have parameterizable input delay values of 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.
The module has IP20 protection, diagnostic alarms, and input-status diagnostic LEDs.
Frequently Asked Questions
What exact Siemens line item is this?
It is Siemens 6ES7221-1BF32-0XB0, product type SM 1221, DI 8×24 V DC.
How many digital inputs does the module have?
It has 8 digital inputs, arranged in groups of 2.
What supply voltage does it use?
The rated supply voltage is 24 V DC, with a permissible range from 20.4 V to 28.8 V DC.
What input configuration and protection does it have?
It has Sink/Source inputs and IP20 protection.
