SM 1221 SIMATIC S7 1200 PLC 6ES7221-1BF32-0XB0 SM 1221 DI 8x24 V DC

SIMATIC S7-1200 PLC 6ES7221-1BF32-0XB0 SM 1221 DI 8x24 V DC

I. Product Description:

The SIMATIC 6ES7221-1BF32-0XB0 is a digital input expansion module for the SIMATIC SIMATIC S7-1200 series; its full model number is SM 1221 DI 8x24 V DC. It is used to add additional digital input points to the S7-1200 PLC for acquiring 24 V DC signals from field devices such as pushbuttons, switches, and proximity switches

It features 8 digital input channels.

The rated voltage is 24 V DC.

The input delay time can be set in 4-channel groups within a range of 0.2 ms to 12.8 ms.

The isolation voltage between the input channels and the backplane bus is 500 V AC (sustained for 1 minute).

The maximum current is 105 mA, with a typical power consumption of 1.5 W. Each active input channel also draws an additional 4 mA of current from the 24 V load power supply.

II. Product Specifications:

SIMATIC 6ES7221-1BF32-0XB0｜SIMATIC S7-1200 SM 1221 Digital Input Module

Permitted Input Voltage Range: 20.4 to 28.8 V DC;
Input Type: Sink/source;
Input Characteristic: IEC 61131-2 Type 1;
Signal "0" Input Voltage: -30 to 5 V DC;
Signal "1" Input Voltage: 15 to 30 V DC;
Input Current at Signal "1": Approximately 4 mA;
Input Delay: Approximately 3.2 ms;
High-Speed Inputs: Supported;
High-Speed Counter Functions: Supported according to CPU and system configuration;
Input Frequency: Up to 100 kHz for compatible high-speed functions;
Digital Input Channels: 16;
Channel Grouping: Inputs arranged in groups for system integration;
Electrical Isolation: Inputs electrically isolated from the backplane bus;
Hardware Interrupts: Supported;
Diagnostic Functions: Module and input diagnostics supported;
Status Indication: LED indication for input status;
Power Supply: 24 V DC supplied through the S7-1200 system;
Backplane Bus Current Consumption: Approximately 80 mA at 5 V DC;
Typical Power Loss: Approximately 1.5 W;
Engineering Software: STEP 7 / TIA Portal;
Configuration: Parameterizable through the TIA Portal engineering environment;
System Compatibility: SIMATIC S7-1200 automation systems;
Mounting: Direct mounting to the right side of a compatible S7-1200 CPU or signal module;
Protection Rating: IP20;
Operating Temperature: -20 to 60 °C;
Storage / Transport Temperature: -40 to 70 °C;
Maximum Relative Humidity: 95% at 25 °C, non-condensing;
Maximum Cable Length: Up to 500 m for shielded cables and up to 300 m for unshielded cables;
Dimensions (W × H × D): Approximately 45 × 100 × 75 mm;
Net Weight: Approximately 0.148 kg;
Typical Applications: Digital sensor signal acquisition, switch monitoring, proximity sensor interfaces, machine automation, conveyor systems, packaging equipment, production lines, and industrial automation systems based on the SIMATIC S7-1200 

III. Technical Parameters:

SIMATIC S7-1200, Digital input SM 1221, 8 DI, 24 V DC, Sink/Source

IV. Industries Served:

SIMATIC 6ES7221-1BF32-0XB0 is designed to flexibly expand the number of digital input points for the S7-1200 PLC system.

Applications include light industrial machinery, packaging machinery, assembly machinery, machine tools, and lifting and transport equipment.

It is used in manufacturing workshops and conveyor systems in industries such as packaging, food, and automotive to acquire the on/off status of field devices.

V. Customer Case Studies:

Customer Industry: Automated Manufacturing Plants

Products Purchased: SIMATIC ET 200SP Series, SIMATIC S7-1200 Series, SIMATIC S7-1500 Series,

Contract Value: 800,000+

1,Addressing the pain points of cross-border transactions for clients in Belarus, we leveraged the localized payment channels and practical experience we’ve accumulated over many years of deep engagement in the Russian-speaking region. This enabled us to successfully overcome the limitations of conventional cross-border payment channels, efficiently complete the entire closed-loop payment process, and ensure the smooth execution of this transaction.

2,Previously, this client had been unable to source products directly from the Chinese market due to cross-border settlement obstacles. During this collaboration, the client not only highly commended the genuine quality and supply efficiency of the SIMATIC industrial automation products delivered but also, based on the smooth collaboration and mutual trust between both parties, formally signed a long-term strategic cooperation agreement, laying a solid foundation for continued, stable bulk procurement in the future.

VI. FAQ:

1,How to buy the product?

Contact our sales professionals online. A variety of contact options are available:

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E-mail: contact@szlyzn.com

Or click on the Contact Us page, enter your name, email, phone number and specific request, submit it to our customer service and we will contact you within 24 hours. 

2,Are the products all genuine? Is the quality guaranteed?

Our products are 100% guaranteed quality, 100% guaranteed authentic, regular channel, you can buy with confidence. Each product can be checked for authenticity, all from major genuine brands, if you have any questions, please feel free to contact our after-sales service. 

3. What should I do if I can't find what I want?

You can do an exact/fuzzy search based on the product model or brand. If you still can't find it, you can feedback the model number or brand of the desired product to our sales staff. 

4. How is the product delivered? Is it safe?

Various delivery methods and regular delivery channels, we will make different packages for different products and strictly guarantee the safety of the products.

Ground, air and sea transportation

DHL/FedEx/UPS/EMS/SF Express/TNT/Depon Express... 

5. What are the payment methods?

01: Alipay payment: choose Alipay payment, the system will automatically generate the payment QR code, the customer opens the Alipay on the cell phone and scans the code to pay.

02: Online online banking: support more than 200 banks and financial institutions such as Industrial and Commercial Bank of China, Agricultural Bank of China, Bank of China, Construction Bank, Bank of Communications, Postal Savings Bank, etc., support credit card, savings card, CBI card, to fully meet the customer's payment needs.

03: Offline Payment: After choosing offline payment, customers can pay the payment to our corporate account through transfer, remittance and other offline payment methods. The account number can be viewed on the order payment page. The offline transfer amount and the order settlement amount must be the same.