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Siemens SIMATIC S7-200 EM 221 8DI Digital Input Module

Name: Siemens 6ES7221-1EF00-0XA0
Brand: Siemens
SKU: 6ES7221-1EF00-0XA0
Availability: InStock

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ManufacturerSiemens

Part number6ES7221-1EF00-0XA0

Series SIMATIC S7-200

Module Type EM 221 Digital Input Module

Inputs 8 Digital Inputs (8DI)

Input Voltage 120 V AC

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8 Digital Inputs 120V AC Input Voltage Optically Isolated Inputs For S7-21X CPU SIMATIC S7-200 Series Expansion Module

Product description

The Siemens SIMATIC S7-200 EM 221 (6ES7221-1EF00-0XA0) is a digital input expansion module designed for the SIMATIC S7-21X series CPUs. This module provides 8 optically isolated digital inputs (8DI) that operate at 120V AC, ensuring clear separation between the field devices and the control system.

This module is specifically intended for use with S7-21X CPUs only. Its optically isolated design enhances noise immunity and protects the CPU from voltage spikes. The EM 221 module is a cost-effective solution for expanding the input capabilities of your S7-200 automation system.

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Technical specifications

Series	SIMATIC S7-200
Module Type	EM 221 Digital Input Module
Inputs	8 Digital Inputs (8DI)
Input Voltage	120 V AC
Isolation	Optically Isolated
Compatibility	S7-21X CPU Only

Common applications

Industrial Control Systems

Machine Automation

Process Monitoring

Data Acquisition

Building Automation

Factory Automation

Compatible systems

Siemens SIMATIC S7-212 CPU Siemens SIMATIC S7-214 CPU Siemens SIMATIC S7-215 CPU

Also known as

Siemens SIMATIC S7-200 EM 221 6ES7221-1EF00-0XA0 Siemens S7-200 Digital Input

Replaces / compatible with

This module is an expansion unit for the SIMATIC S7-21X series CPUs. While not a direct replacement for other part numbers, it is critical for expanding S7-21X input capacity.

Technical note

Expert tip

Ensure the 6ES7221-1EF00-0XA0 module is correctly wired and that the input voltage does not exceed the specified 120V AC to prevent damage and ensure reliable operation.

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Frequently asked questions

What is the input voltage and isolation type for the Siemens EM 221 module 6ES7221-1EF00-0XA0?

The Siemens SIMATIC S7-200 EM 221 module (6ES7221-1EF00-0XA0) features 8 digital inputs operating at 120V AC. These inputs are optically isolated, providing enhanced protection and signal integrity.