DI 32 × 24V DC SIMATIC S7 300 PLC 6ES7321-1BL00-0AA0 SM 321

SIMATIC S7-300 PLC 6ES7321-1BL00-0AA0 SM 321, DI 32×24V DC

I. Product Description:

The SIMATIC 6ES7321-1BL00-0AA0 is a high-density digital input module in the SIMATIC SIMATIC S7-300 series; its full model number is SM 321, DI 32×24V DC. It is used to acquire 24V DC signals from field devices such as pushbuttons, switches, and proximity switches into the PLC system. With 32 input points, it is suitable for control applications requiring the connection of a large number of digital signals

Rated voltage: 24 V DC

Powered by a 24 V DC load power supply; draws a maximum of 15 mA from the 5 V backplane bus; typical power consumption: 6.5 W

Requires a 40-pin front connector for wiring

Supports two-wire sensors (BERO); maximum allowable static current: 1.5 mA

II. Product Specifications:

SIMATIC 6ES7321-1BL00-0AA0｜SIMATIC S7-300 SM 321 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: -3 to 5 V DC;
Signal "1" Input Voltage: 15 to 30 V DC;
Input Current at Signal "1": Approximately 7 mA;
Input Delay: Approximately 1.2 to 4.8 ms;
Input Frequency: Up to 100 Hz;
Channel Grouping: 32 inputs arranged in 4 groups of 8 channels;
Electrical Isolation: Inputs electrically isolated from the backplane bus;
Hardware Interrupts: Supported according to configured parameters;
Diagnostic Functions: Module diagnostics supported;
Status Indication: LED status indication for individual input channels;
Power Supply: 24 V DC;
Backplane Bus Current Consumption: Approximately 30 mA at 5 V DC;
Typical Power Loss: Approximately 5.5 W;
Front Connector: 40-pin front connector;
Engineering Software: STEP 7 / TIA Portal;
Configuration: Parameterizable through the STEP 7 engineering environment;
System Compatibility: SIMATIC S7-300 automation systems;
Mounting: Installation on the S7-300 mounting rail;
Protection Rating: IP20;
Operating Temperature: 0 to 60 °C;
Storage / Transport Temperature: -40 to 70 °C;
Maximum Cable Length: Up to 600 m for shielded cables and up to 1,000 m for unshielded cables, depending on signal conditions;
Dimensions (W × H × D): Approximately 40 × 125 × 120 mm;
Net Weight: Approximately 260 g;
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 S7-300 

III. Technical Parameters:

SIMATIC S7-300, digital input SM 321, isolated 32 DI, 24 V DC, 1x 40-pole

IV. Industries Served:

SIMATIC 6ES7321-1BL00-0AA0 S7-300 Most Common Applications. In packaging machinery, material handling systems, assembly line automation, machine tool control, and robotic systems, this module is used to acquire signals such as position, count, and speed feedback from various sensors (e.g., proximity switches, photoelectric switches).

In water treatment and wastewater treatment plants, building automation (such as lighting system management), and energy management systems, this module is commonly used to monitor equipment status and process variables.

It is also frequently found as a component of production control systems in industries such as automotive manufacturing, food and beverage, and building materials production (e.g., aerated concrete block production).

V. Why choose us?

Pricing: We source directly from China’s Tier 1 channels, eliminating all middleman markups. This means you get competitive prices close to factory cost, and we pass those savings on to you as profit or budget flexibility for your projects.

Inventory and Lead Times: Don’t let stockouts slow down your project. We always maintain ample inventory for best-selling and frequently purchased models such as the S7-300, S7-1200, S7-1500, SIMATIC HMI, and G120. The moment you place your order, the goods are already ready in our warehouse. Within 1–3 business days, you’ll receive an international express tracking number. Whether your factory is located in the Middle East, Southeast Asia, or across Europe and the Americas, our global logistics network helps you save valuable time.

Business Scope: From precision manufacturing in Europe to oil and gas fields in the Middle East, and electronics assembly lines in Southeast Asia, our products and solutions have withstood the test of demanding operating conditions worldwide. We deeply understand the unique characteristics of each market, and this global experience is your guarantee for successful project implementation.

VI. FAQ:

1,How to buy the product?

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

WhatsAPP: +8619731602085

WeChat: Susan20241118

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. 

6,If there is a problem, how to return or exchange the goods?

Customized products cannot be returned unless there is a quality issue, and customized products cannot be canceled.

We only support returns on new and original products. Therefore, this rarely happens.

If a customer requests a return or exchange of a standard product or one of our in-stock products without a valid reason, the customer shall be responsible for all costs incurred for the return or exchange.

Contact information for returns and exchanges:

F-mail: contact@szlyzn.com