Product Description
Key Features
- Product type: SM 1221, DI 16x 24 V DC digital input module.
- Digital inputs: 16 digital inputs, arranged in groups of 4.
- Input voltage: Rated input voltage: 24 V DC; signal 0: 5 V DC or 0.5 mA; signal 1: 15 V DC at 2.5 mA.
- Signal response: Parameterizable standard inputs with 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.
- Diagnostics and isolation: Input-status and maintenance LEDs; digital inputs have potential separation between channels in groups of 4 and from the backplane bus at 707 V DC (type test).
- Protection and lifecycle: IP20 protection and Active Product lifecycle.
Technical Summary
| Product type | SM 1221, DI 16x 24 V DC |
|---|---|
| Number of digital inputs | 16 |
| Input arrangement | In groups of 4 |
| Rated input voltage | 24 V DC |
| Signal 0 | 5 V DC or 0.5 mA |
| Signal 1 | 15 V DC at 2.5 mA |
| Standard input delay | 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 |
| IP degree of protection | IP20 |
| Product lifecycle | Active Product |
Frequently Asked Questions
What exact order number should be confirmed for this input module?
Confirm Siemens order number 6ES7221-1BH50-0XB0 and product type SM 1221, DI 16x 24 V DC.
How many digital inputs does the module have?
It has 16 digital inputs, arranged in groups of 4.
What input voltage does it use?
The rated input voltage is 24 V DC. Signal 0 is 5 V DC or 0.5 mA, and signal 1 is 15 V DC at 2.5 mA.
What cable lengths are supported?
The maximum cable length is 500 m for shielded cable and 300 m for unshielded cable.
