Product Overview
Technical Summary
| Product type | SM 1221, DI 16×24 V DC |
|---|---|
| Digital inputs | 16, in groups of 4 |
| Rated supply voltage | 24 V DC |
| Permissible supply voltage | 20.4 V to 28.8 V DC |
| Input voltage | Signal 0: 5 V DC at 1 mA; signal 1: 15 V DC at 2.5 mA |
| Input current | Signal 0: max. 1 mA; signal 1: min. 2.5 mA, typ. 4 mA |
| Protection and diagnostics | IP20; diagnostic alarm; input-status LED |
Key Features
16 digital inputs, arranged in groups of 4.
SM 1221, DI 16×24 V DC with Sink/Source signals and an IEC 61131 type 1 input characteristic curve.
Rated supply voltage: 24 V DC; permissible range: 20.4 V to 28.8 V DC.
Signal 0: 5 V DC at 1 mA; signal 1: 15 V DC at 2.5 mA.
Diagnostic alarm and input-status LED indication are available; protection degree: IP20.
Frequently Asked Questions
What is the exact product type of 6ES7221-1BH32-0XB0?
The product type is SM 1221, DI 16×24 V DC.
How many digital inputs does the module have?
It has 16 digital inputs in groups of 4.
What supply voltage does the module use?
The rated supply voltage is 24 V DC, with a permissible range of 20.4 V to 28.8 V DC.
What cable lengths are supported?
The maximum cable length is 500 m for shielded cable and 300 m for unshielded cable.
