You are here:
Siemens 6ES7221-1BH32-0XB0 SIMATIC S7-1200 Digital Input SM 1221
The Siemens 6ES7221-1BH32-0XB0 is a SIMATIC S7-1200 SM 1221 digital input module with 16 digital inputs for acquiring standard 24 V DC switching signals from field devices. It provides twice the input density of the 8-channel variant while maintaining the same compact S7-1200 module concept, making it suitable for machines and control systems with a larger number of discrete signals. The module supports sink/source inputs, parameterizable input delays, diagnostic alarms, and LED input-status indication for reliable industrial signal monitoring.
Looking for a Quote? Contact Us Now
Categories: PLC I/O Modules
Description
The Siemens SIMATIC S7-1200 SM 1221, DI 16×24 V DC provides 16 digital inputs for acquiring standard 24 V DC binary signals from sensors, switches, push buttons, and other field devices. With 16 input channels, the module offers a higher-density solution for automation systems that require a larger number of discrete signals to be monitored by the PLC. The inputs use the IEC 61131 Type 1 characteristic and provide reliable recognition of digital ON and OFF states within the specified voltage and current ranges. Parameterizable input delays allow the response of the inputs to be adapted to different machine signals and switching conditions.
The module integrates into the SIMATIC S7-1200 system as a digital input expansion module and provides 16 inputs arranged in four groups of four. LED indication allows the status of individual inputs to be monitored directly at the module, while diagnostic functionality supports dependable system operation. It supports shielded field cables up to 500 m, making it suitable for installations where field devices are located at greater distances from the control panel. The higher channel density makes the module particularly suitable for machine automation, production lines, conveyor systems, process equipment, control panels, machine-state monitoring, alarm and interlock circuits, and other industrial applications requiring multiple 24 V DC digital inputs.
QTech Safety is a leading supplier of Siemens 6ES7221-1BH32-0XB0 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 6ES7221-1BH32-0XB0 SIMATIC S7-1200 Digital Input SM 1221
- SIMATIC S7-1200 SM 1221 digital input module.
- Provides 16 digital inputs.
- Designed for 24 V DC input signals.
- Supports sink/source input configuration.
- Inputs arranged in 4 groups of 4.
- IEC 61131 Type 1 input characteristic.
- Parameterizable input delay.
- Supports multiple selectable input-delay times.
- Interrupt inputs available.
- Diagnostic alarm functionality.
- LED indication for input status.
- Supports shielded cables up to 500 m.
- Higher input density for larger automation systems.
- Suitable for sensors, switches, push buttons, and machine-status signals.
Technical Specifications of Siemens 6ES7221-1BH32-0XB0
- Product Type: SM 1221, DI 16×24 V DC
- Product Family: SIMATIC S7-1200 SM 1221 digital input modules
- Article Number: 6ES7221-1BH32-0XB0
- Number of Digital Inputs: 16
- 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: 4 groups of 4
- Simultaneously Controllable Inputs: 16
- 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: 130 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. 210 g
- Certifications/Approvals: CE, CSA, UL, cULus, FM, RCM, KC, Marine, CCC-Ex
Applications
The Siemens 6ES7221-1BH32-0XB0 SIMATIC S7-1200 Digital Input SM 1221 is commonly used in:
- Monitoring multiple industrial sensors
- Push-button and switch monitoring
- Machine-state and position detection
- Digital alarm and interlock signals
- Conveyor and production-line automation
- Industrial control panels
- Machine and equipment automation
- Expanding digital input capacity in SIMATIC 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)
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.
