# SIMATIC ET 200SP Distributed I/O system

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|Document:|Distributed I/O system (11/2023, English)||||
|Type of topic:|Action|

  

Replacing an I/O module

  

#### Introduction

When an I/O module is installed for the first time, a part of the coding element clicks into the BaseUnit. When you replace an I/O module with the same type of module, the correct coding element is already present in the BaseUnit.

#### Requirement

Refer to section [Application planning](https://support.industry.siemens.com/cs/mdm/58649293?c=158604469259&lc=en-de&dl=en).

#### Replacing an I/O module

You have already removed the I/O module.

To replace an I/O module, follow these steps:

1. Remove the coding element (part) from the underside of the new I/O module.
2. Insert the new I/O module (same module type) into the BaseUnit until you hear it click into place.
3. Mark the new I/O module (labeling strip, equipment labeling plate).

  

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