Product Overview
Technical Summary
| Product type | SM 1221, DI 16x 24 V DC |
|---|---|
| Digital inputs | 16 |
| Rated input voltage | 24 V DC |
| Signal 0 | 5 V DC or 0.5 mA |
| Signal 1 | 15 V DC at 2.5 mA |
| 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 |
| Protection | IP20 |
| Product lifecycle | Active Product |
Key Features
Has 16 digital inputs with a 24 V DC rated input value and sink/source input description.
Signal 0 is 5 V DC or 0.5 mA; signal 1 is 15 V DC at 2.5 mA.
Standard inputs support selectable delays 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.
Maximum cable length is 500 m for shielded cable and 300 m for unshielded cable.
Has status LEDs for the inputs and maintenance indication LEDs; diagnostic alarms are not available.
Has IP20 protection and potential separation between channels in groups of 4; separation between channels and the backplane bus is 707 V DC (type test).
Frequently Asked Questions
What is the exact product type of Siemens 6ES7221-1BH50-0XB0?
It has the product type designation 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 for potential separation.
What input signals are supported?
Signal 0 is 5 V DC or 0.5 mA, while 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.
