Technical Specifications
| Category | Parameter | Value |
|---|---|---|
| General Information | Product type designation | SM 1221, DI 8×24 V DC |
| Connection Method | Required front connector | Yes |
| Mechanics / Material | Enclosure material (front) | Plastic |
| Dimensions | Width | 45 mm |
| Height | 100 mm | |
| Depth | 75 mm | |
| Weight | Weight, approx. | 170 g |
| Supply Voltage | Rated value (DC) | 24 V |
| Permissible range, lower limit (DC) | 20.4 V | |
| Permissible range, upper limit (DC) | 28.8 V | |
| Input Current | From backplane bus 5 V DC, max. | 105 mA |
| Digital Inputs | Number of digital inputs | 8 |
| Grouping | In groups of 2 | |
| From load voltage L+ (without load), max. | 4 mA per channel | |
| Input characteristic curve | IEC 61131-2, Type 1 | |
| Output Voltage / Header | Supply voltage of transmitters / header | Present |
| Power Loss | Power loss, typ. | 1.5 W |
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Our address
32D floor, Guomao Building, No.388, Hubin South Road, Siming District, Xiamen, China
Phone Number
+86 18030132586
cn@mooreplc.com
Description
The 6ES7221-1BF32-0XB0 Siemens SM 1221, DI 8×24 V DC is a compact and reliable digital input expansion module designed for seamless integration into SIMATIC PLC systems. It provides 8 digital input channels, optimized for acquiring 24 V DC signals from field devices such as sensors, limit switches, and pushbuttons in industrial automation environments.
Compliant with IEC 61131-2 Type 1 input characteristics, the module ensures stable and accurate signal detection even under demanding operating conditions. It operates with a rated supply voltage of 24 V DC and supports a wide permissible range from 20.4 V to 28.8 V, making it suitable for standard industrial power networks.
The SM 1221 features a compact 45 mm-wide design, requires a front connector for secure wiring, and offers integrated sensor supply voltage via the header, simplifying installation and reducing external components. With low power loss and robust construction, it is ideal for machine building, factory automation, and control cabinet applications.
Our Services
1. Orders are shipped within 3 business days after payment confirmation, with all items fully inspected to ensure quality and reliability.
2. We offer competitive pricing, particularly on discontinued and hard-to-find parts, often beating original manufacturer prices without compromising quality.
3. All products are 100% genuine and brand new, sourced from trusted suppliers and backed by a 1-year quality guarantee for complete peace of mind.
FAQ
The SM 1221 is a digital input expansion module for SIMATIC PLC systems, designed to reliably acquire 24 V DC digital signals from field devices such as sensors, switches, and pushbuttons.
This module offers 8 digital input channels, grouped in sets of 2, enabling flexible signal wiring and organization.
The module is designed for 24 V DC digital signals, fully compliant with IEC 61131-2, Type 1 input characteristics.
The module draws up to 105 mA from the 5 V DC backplane bus, with a maximum of 4 mA per input channel from the load voltage L+ (without load).
The SM 1221 has a compact design measuring 45 × 100 × 75 mm and weighs approximately 170 g, allowing easy installation in control cabinets.
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Contact Sales Felicia for quotation and more info:
Mobile: +86 18030132586
Email: cn@mooreplc.com
Whatsapp(Wechat): +86 18030132586
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