Siemens SIMATIC S7-300 SM 321 Digital Input Module

Siemens SIMATIC S7-300 SM 321, 8 DI, 120/230V AC Digital Input Module.

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ManufacturerSiemens

Part number6ES7321-1FF00-0AA0

Module Type Digital Input (DI)

Series SIMATIC S7-300 SM 321

Inputs 8

Voltage 120V AC / 230V AC

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12-month warranty

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Veteran-owned

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8 Digital Inputs 120/230V AC Signal Compatibility Optically Isolated Inputs SIMATIC S7-300 System Robust Design Reliable Performance

Product description

The Siemens SIMATIC S7-300 SM 321 module (6ES7321-1FF00-0AA0) is a digital input module designed for the SIMATIC S7-300 PLC system. It provides 8 optically isolated digital inputs that accept 120V AC or 230V AC signals. The module features a 20-pin connector for easy and secure wiring.

This input module is widely used in industrial control applications requiring direct interface with AC control signals from devices such as pushbuttons, limit switches, and sensors. It is a crucial component for building robust automation solutions in sectors like manufacturing, material handling, and process control.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 6ES7321-1FF00-0AA0. Secure reliable components for your automation needs and benefit from our expertise and commitment to quality.

Technical specifications

Module Type	Digital Input (DI)
Series	SIMATIC S7-300 SM 321
Inputs	8
Voltage	120V AC / 230V AC
Isolation	Optically Isolated
Connector	20-pin

Common applications

Machine Control

Process Automation

Manufacturing

Material Handling

Industrial Control Systems

Factory Automation

Compatible systems

Siemens SIMATIC S7-300 PLC Systems

Also known as

Siemens SM 321 DI Module S7-300 8 DI Module 6ES73211FF000AA0

Replaces / compatible with

This module is part of the SIMATIC S7-300 I/O offering and is designed to work within that platform.

Technical note

Expert tip

Ensure the AC input voltage is within the specified 120V AC / 230V AC range and that proper grounding is maintained for optimal performance and safety.

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Frequently asked questions

What voltage levels can the Siemens 6ES7321-1FF00-0AA0 digital input module accept?

The Siemens 6ES7321-1FF00-0AA0 module can accept both 120V AC and 230V AC signals, providing flexibility for various industrial applications.