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Siemens SIMATIC S7-300 SM 321 Digital Input Module - 16DI

Siemens SIMATIC S7-300 SM 321: 16-channel 24V DC Digital Input Module.

● In Stock 12-Mo Warranty Same-Day Dispatch Ships Worldwide 🎖 Veteran-Owned

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ManufacturerSiemens

Part number6ES7321-1BH00-0AA0

Type Digital Input Module

Series SIMATIC S7-300 SM 321

Channels 16 DI

Input Voltage 24V DC

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12-month warranty

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Veteran-owned

CAGE: 9NK75

16 Digital Inputs 24V DC Operation Optically Isolated Channels High Signal Integrity SIMATIC S7-300 Compatible 20-Pin Connector

Product description

The Siemens SIMATIC S7-300 SM 321 digital input module (6ES7321-1BH00-0AA0) provides 16 optically isolated digital inputs for 24V DC signals. This module is a key component of the SIMATIC S7-300 automation system, designed for reliable signal acquisition in industrial control applications.

This module is essential for monitoring the status of digital devices such as switches, pushbuttons, and proximity sensors in industrial automation, process control, and manufacturing environments. The optical isolation ensures signal integrity and protects the PLC from electrical noise and voltage transients.

Stanlo Automation, a veteran-owned distributor, offers the Siemens 6ES7321-1BH00-0AA0 SM 321 digital input module. We provide quality surplus automation components to help you maintain and expand your SIMATIC S7-300 systems cost-effectively. Trust Stanlo for reliable automation parts and expert support.

Technical specifications

Type	Digital Input Module
Series	SIMATIC S7-300 SM 321
Channels	16 DI
Input Voltage	24V DC
Isolation	Optical
Connector	20-pin

Common applications

Industrial Control

Manufacturing Automation

Process Automation

Machine Monitoring

SCADA Systems

PLC Input Signals

Compatible systems

Siemens SIMATIC S7-300 CPUs SIMATIC HMI Panels SCADA Systems

Also known as

Siemens S7-300 DI Module SM 321 16DI 6ES7321-1BH00-0AA0 Input Card

Replaces / compatible with

This module is a direct replacement for existing Siemens SIMATIC S7-300 SM 321 16DI modules (6ES7321-1BH00-0AA0) and is compatible with all SIMATIC S7-300 CPUs.

Technical note

Expert tip

Ensure the 20-pin connector is securely fastened to maintain proper signal integrity and prevent environmental ingress.

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Frequently asked questions

What is the voltage rating and isolation type for the Siemens 6ES7321-1BH00-0AA0 digital input module?

The Siemens 6ES7321-1BH00-0AA0 features 16 digital inputs rated for 24V DC operation and provides optical isolation between the field signals and the PLC backplane.