PLC Digital Input Module

Product Description

This Siemens SM 321 digital input module is part of the SIMATIC S7-300 series, offering 32 digital inputs for 24V DC signals, ideal for industrial automation applications.

Product Specifications

- Manufacturer: Siemens
- Product Line: SIMATIC S7-300
- Module Type: Digital Input Module SM 321
- Part Number: 6ES7321-1BL00-0AAO
- Number of Inputs: 32
- Input Voltage: 24V DC
- Hardware Version (E-Stand): 4
- ATEX, UL, FM certified for hazardous locations

Product Label Info

Model Code / Product Markings: 6ES7321-1BL00-0AA0

SKU: 2603121016

GTIN-13: 4025515060773

Application

Designed for acquiring binary control signals in manufacturing and process control applications.

Country of Origin

This product is manufactured in Germany.

Method of Application

Seamless integration into S7-300 PLC rack for high-density I/O.

Safety Instructions

For use in hazardous locations, certified by ATEX, UL, and FM.

Availability

Order now from PLC2Day, items in stock and ready for fast worldwide delivery.

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Documentation

• Official datasheet or product page Siemens

Resources

Additional resources and manuals are available upon request. Contact us for details.

Internal & External Links

• All products from Siemens
• Explore similar products in Automation

Frequently Asked Questions

What is the PLC Digital Input Module used for?

This part is typically used in industrial automation environments to acquire binary control signals from sensors and switches.

What are the key advantages of the PLC Digital Input Module?

This module offers high-density I/O, robust design, and seamless integration into S7-300 PLC systems.

Is 6ES7321-1BL00-0AA0 compatible with my system?

If you're using Siemens control systems, especially the S7-300 series, then this model will likely be compatible. Contact us to verify.

Alternatives to 6ES7321-1BL00-0AA0

If you're looking for a similar part, consider exploring other digital input modules within the SIMATIC S7-300 series.

Can I sell my surplus stock to PLC2DAY?

Yes, absolutely. PLC2Day accepts surplus stock and collaborates with companies for surplus recovery and inventory clearance. Contact us for more information.

Need Help?

Call us at +31(0)165 20 11 80 or get in touch online.

Last Update: 12/03/2026

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