Product Overview
Technical Summary
| Product designation | SM 1221, DI 16×24 V DC |
|---|---|
| Base module | 6ES7221-1BH32-0XB0 |
| Rated supply voltage | 24 V DC |
| Permissible supply voltage | 20.4 V to 28.8 V DC |
| Digital inputs | 16, in groups of 4 |
| Input characteristic | IEC 61131, type 1 |
| Protection | IP20 |
| Operating temperature | -40 °C to 70 °C; start-up at -25 °C |
| Mounting | Front connector required; horizontal or vertical installation |
| Product lifecycle | Active Product |
Key Features
- Product designation: SM 1221, DI 16×24 V DC; based on 6ES7221-1BH32-0XB0.
- Digital inputs: 16 digital inputs, in groups of 4, with IEC 61131 type 1 input characteristic.
- Supply voltage: Rated value: 24 V DC; permissible range: 20.4 V to 28.8 V DC.
- Input signals: Signal "0": 5 V DC at 1 mA; signal "1": 15 V DC at 2.5 mA.
- Environmental protection: IP20 protection and conformal coating for printed circuit board assemblies according to EN 61086, Class 2 for high reliability.
- Operating temperature: -40 °C to 70 °C; start-up at -25 °C. Above +60 °C, 8 inputs may be simultaneously activated, with no adjacent points, for horizontal mounting.
Frequently Asked Questions
What does Siemens 6AG1221-1BH32-2XB0 identify?
It identifies a SIPLUS SM 1221 digital input module with product type designation SM 1221, DI 16×24 V DC.
Which specifications distinguish this MLFB variant?
The supplied variant has 16 digital inputs, 24 V DC rated supply, conformal coating, IP20 protection, and an operating temperature of -40 °C to 70 °C with start-up at -25 °C.
What mounting and connection details should be checked?
A front connector is required. The module supports horizontal and vertical installation; at temperatures above +60 °C, simultaneous activation is limited to 8 non-adjacent inputs for horizontal mounting.
What details are needed for a quotation?
Provide the complete 6AG1221-1BH32-2XB0 order number together with the required quantity and destination.
