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Siemens SIMATIC S7-300 6ES7321-1FF81-0AA0 Digital Input Module

Name: Siemens 6ES7321-1FF81-0AA0
Brand: Siemens
SKU: 6ES7321-1FF81-0AA0
Availability: InStock

Siemens SIMATIC S7-300 8-Channel Digital Input Module for 120V/230V AC.

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ManufacturerSiemens

Part number6ES7321-1FF81-0AA0

Module Type Digital Input SM 321

Manufacturer Siemens

Series SIMATIC S7-300

Inputs 8 DI

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8 Digital Inputs Optically Isolated Expanded Temperature Range SIMATIC S7-300 Compatible AC Voltage Input Reliable Signal Acquisition

Product description

The Siemens 6ES7321-1FF81-0AA0 is a SIMATIC S7-300 Digital Input Module (SM 321) featuring 8 optically isolated digital inputs. It operates with 120V/230V AC and is designed for an expanded temperature range, making it suitable for demanding environments. The module uses a 20-pin connector for easy integration into Siemens S7-300 automation systems.

This module is ideal for industrial automation applications requiring reliable digital signal acquisition, such as monitoring status from switches, sensors, and control panels in manufacturing, processing plants, and building management systems. Its robust design and expanded temperature range ensure performance in challenging conditions.

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Technical specifications

Module Type	Digital Input SM 321
Manufacturer	Siemens
Series	SIMATIC S7-300
Inputs	8 DI
Voltage	120V/230V AC
Isolation	Optically Isolated
Temperature Range	Expanded
Connector	20-pin

Common applications

Industrial Automation

Manufacturing

Process Control

Building Management

Machine Control

Data Acquisition

Compatible systems

Siemens SIMATIC S7-300 PLCs

Also known as

Siemens SM 321 Input Module S7-300 Digital Input Card 6ES7321-1FF81-0AA0 Module

Replaces / compatible with

This module is a direct replacement for other Siemens SM 321 modules with similar specifications within the SIMATIC S7-300 series.

Technical note

Expert tip

Ensure proper wiring and grounding to maintain optical isolation integrity, especially in high-noise industrial environments.

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Frequently asked questions

What voltage is required for the Siemens 6ES7321-1FF81-0AA0 Digital Input Module?

The Siemens 6ES7321-1FF81-0AA0 Digital Input Module is designed to accept 120V/230V AC input signals. Ensure your connected devices operate within this voltage range for proper functionality.