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Siemens 6ES7221-1BF32-0XB0 SIMATIC S7-1200 Digital Input SM 1221
The Siemens 6ES7221-1BF32-0XB0 is a SIMATIC S7-1200 SM 1221 digital input module with 8 digital inputs for acquiring standard 24 V DC switching signals. It is designed to expand the digital input capacity of S7-1200 controllers and supports both sink and source wiring, making it suitable for sensors, switches, push buttons, and other binary field devices. The module provides parameterizable input delays and diagnostic functions for dependable signal acquisition in industrial automation applications.
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Categories: PLC I/O Modules
Description
The Siemens SIMATIC S7-1200 SM 1221, DI 8×24 V DC provides 8 digital inputs for acquiring and processing standard 24 V DC switching signals from field devices. The module is designed for connection to digital sensors, push buttons, switches, limit switches, proximity sensors, and other binary devices used in industrial automation systems. Its inputs follow the IEC 61131 Type 1 characteristic and support defined signal thresholds for reliable detection of ON and OFF states. The input delay can be parameterized over several selectable values, allowing the module to be adapted to different switching speeds and signal conditions in machine-control applications.
The module provides a compact method of expanding the digital input capability of a SIMATIC S7-1200 controller and is suitable for applications where additional field signals need to be acquired without changing the main CPU. Its 8 inputs are arranged in two groups of four and include LED status indication for convenient monitoring of input states. The module supports long field wiring, with shielded cable lengths of up to 500 m, and provides diagnostic functionality for dependable operation. Its compact design and straightforward integration make it suitable for machine automation, control panels, conveyor systems, production equipment, equipment-status monitoring, alarms, interlocks, and general industrial digital signal acquisition.
QTech Safety is a leading supplier of Siemens 6ES7221-1BF32-0XB0 SIMATIC S7-1200 Digital Input SM 1221 in Ireland, offering competitive prices and fast worldwide shipping across United Kingdom (UK), Germany, France, Italy, Spain, United States USA, Canada, Mexico, and Western Australia (Perth). Buy Siemens PLC I/O Modules from one of Ireland’s most trusted industrial safety equipment suppliers.
Features of Siemens 6ES7221-1BF32-0XB0 SIMATIC S7-1200 Digital Input SM 1221
- SIMATIC S7-1200 SM 1221 digital input module.
- Provides 8 digital inputs.
- Designed for 24 V DC input signals.
- Supports sink/source input configuration.
- Inputs arranged in 2 groups of 4.
- IEC 61131 Type 1 input characteristic.
- Parameterizable input delay.
- Supports multiple selectable input-delay times.
- Diagnostic alarm functionality.
- LED indication for input status.
- Supports shielded cables up to 500 m.
- Compact S7-1200 expansion module.
- Suitable for sensors, switches, push buttons, and machine-status signals.
Technical Specifications of Siemens 6ES7221-1BF32-0XB0
- Product Type: SM 1221, DI 8×24 V DC
- Product Family: SIMATIC S7-1200 SM 1221 digital input modules
- Article Number: 6ES7221-1BF32-0XB0
- Number of Digital Inputs: 8
- Rated Input Voltage: 24 V DC
- Permissible Supply Voltage: 20.4–28.8 V DC
- Signal 0 Input Voltage: 5 V DC at 1 mA
- Signal 1 Input Voltage: 15 V DC at 2.5 mA
- Signal 0 Permissible Quiescent Current: 1 mA max.
- Signal 1 Input Current: 2.5 mA min.; 4 mA typ.
- Input Characteristic: IEC 61131 Type 1
- Input Groups: 2 groups of 4
- Simultaneously Controllable Inputs: 8
- Standard Input Delay: Parameterizable, 0.2–12.8 ms
- Interrupt Inputs: Yes
- Input-Status Indication: Yes
- Diagnostic Alarm: Yes
- Shielded Cable Length: 500 m max.
- Unshielded Cable Length: 300 m max.
- Backplane Bus Current: 105 mA max.
- Supply Voltage: 24 V DC
- Isolation: Yes
- Degree of Protection: IP20
- Operating Temperature: −20°C to +60°C
- Storage/Transport Temperature: −40°C to +70°C
- Relative Humidity: Up to 95% at 25°C, non-condensing
- Required Front Connector: Yes
- Dimensions (W × H × D): 45 × 100 × 75 mm
- Weight: Approx. 170 g
- Certifications/Approvals: CE, CSA, UL, cULus, FM, RCM, KC, Marine, CCC-Ex
Applications
The Siemens 6ES7221-1BF32-0XB0 SIMATIC S7-1200 Digital Input SM 1221 is commonly used in:
- Industrial sensor monitoring
- Push-button and switch monitoring
- Machine-status detection
- Limit and position-switch applications
- Digital alarm and interlock signals
- Conveyor and production-line automation
- Control panels and machine automation
- Expanding digital input capacity in S7-1200 systems
Why Choose QTech Safety?
At QTech Safety, we’re more than just a safety supplier we’re your trusted partner in workplace protection and compliance.
Here’s why companies across UK and Ireland (EU) choose us for safety products and training:
- Comprehensive Range of Safety Equipment:
From gas detection and PPE to industrial safety tools, we offer one of the widest selections of trusted brands all at competitive Irish market prices. - Test & Measurement Instruments You Can Trust:
We supply a wide range of test and measurement instruments from the most leading and trusted brands, including industrial sensors, multimeters, oscilloscopes, accelerometers, proximity sensors, and other advanced measurement tools to support accurate diagnostics, condition monitoring, calibration, and maintenance applications. - Expert Health & Safety Training:
We provide professional health and safety training programmes designed to help your workforce stay compliant and confident on the job. - Fast, Reliable Delivery Worldwide:
Whether you’re in Texas United States or Perth Western Australia, our fast delivery service ensures you get your safety equipment quickly and efficiently. - Trusted by European Businesses:
We’re proud to support industries across Europe (UK) with certified safety solutions, expert advice, and responsive customer service.
We Ship Worldwide
At QTech Safety, we supply industrial sensors and instrumentation across Ireland, offering fast and reliable worldwide delivery. Through strong global logistics partnerships, we ensure efficient shipping and professional support for customers in Europe, North America, and Australia.
🡆 Europe (United Kingdom, Ireland, Germany, France, Italy, Spain, and the rest of European Union)
🡆 Australia (Western Australia WA, Queensland QLD, and New South Wales NSW)
🡆 North America (United States, Canada, Mexico)
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