Siemens SIMATIC S7-300 Digital Input Module SM 321

Product Description

This Siemens SIMATIC S7-300 Digital Input Module SM 321 is a robust module designed to expand the capabilities of your S7-300 PLC system by providing 16 optically isolated digital inputs. It operates on a standard 24V DC voltage, making it suitable for connecting a wide range of industrial sensors, switches, and other digital signal sources.

Product Specifications

Manufacturer: Siemens

Product Series: SIMATIC S7-300

Module Type: Digital Input Module SM 321

Part Number: 6ES7321-1BH02-0AA0

Number of Inputs: 16

Input Voltage: 24V DC

Isolation: Optically Isolated

Hardware Version (E-Stand): 5

Certifications: Includes ATEX for use in hazardous environments (II 3 G Ex nA II T4)

Product Label Info

Model Code / Product Markings: 6ES7321-1BH02-0AA0

Application

This module is suitable for various automation tasks in manufacturing and process control environments.

Country of Origin

This product is manufactured in Germany.

Method of Application

Follow standard installation procedures for PLC modules and ensure proper integration with your S7-300 system.

Safety Instructions

Handle this module according to standard industrial safety guidelines. Ensure proper grounding and voltage compatibility.

Availability

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

Need urgent and express delivery, sourcing, or repairs? Contact us now.

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 Siemens SIMATIC S7-300 Digital Input Module SM 321 used for?

This module is typically used in manufacturing and process control environments to expand the capabilities of S7-300 PLC systems.

What are the key advantages of Siemens SIMATIC S7-300 Digital Input Module SM 321?

It provides 16 optically isolated digital inputs, reliable performance, and compatibility with a wide range of industrial sensors.

Is 6ES7321-1BH02-0AA0 compatible with my system?

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

Alternatives to 6ES7321-1BH02-0AA0

If you're looking for a similar part, consider exploring other Siemens modules with compatible functionalities.

Can I sell my surplus stock to PLC2DAY?

Yes, absolutely. Contact us for more information on surplus stock recovery and resale options.

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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