> For the complete documentation index, see [llms.txt](https://support.powerio.com/hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.powerio.com/hub/codesys-hvac/en/hvac-csv-library/beschreibung.md).

# Description

{% columns %}
{% column width="25%" %}

<figure><img src="/files/b24f2d00dfe380be8f4cce79c74d16b878418784" alt="" width="100"><figcaption></figcaption></figure>
{% endcolumn %}

{% column width="75%" %}
The HVACCSV Library enables the recording and storage of data in CSV files. This allows measured values, process data, and other information to be logged on a time-controlled basis and saved as CSV files for further analysis.
{% endcolumn %}
{% endcolumns %}

***

So that you can get started right away, we offer the library as a download. A license is not required for use. If you need further support, please do not hesitate to contact us.

<a href="/spaces/ltcbXgy6Y2teLoU01eGk/pages/21aa59001b001bf730908a85ef784fee3bd98a8a" class="button primary" data-icon="up-right-from-square">Download</a> <a href="https://store.codesys.com/de/hvac-building-process-automation-sl.html" class="button secondary" data-icon="seal">Purchase license</a> <a href="https://www.powerio.com/de/kontakt" class="button secondary" data-icon="question">Get support</a>

{% hint style="info" %}
**Licensing:**

Without purchase of a license (only *Download*) the library runs for **30 minutes as an unrestricted trial version**. For productive use a Single License (SL) / single-device license is required per controller.\
For instructions on installing licenses, please visit the page [Product Licensing](/hub/codesys-hvac/en/overview/licensing.md).
{% endhint %}

### Overview

{% columns %}
{% column width="91.66666666666666%" %}

<figure><img src="/files/358e077ef1c207fe8341c684a4e4885bd7b13c1b" alt=""><figcaption></figcaption></figure>

<p align="center"><em>Time-controlled data logging in CSV files with configurable recording and storage intervals.</em></p>
{% endcolumn %}

{% column width="8.333333333333343%" %}

{% endcolumn %}
{% endcolumns %}

***

### Description

With this library, you can log process data directly from CODESYS into CSV files. The library offers flexible configuration options for recording and storage intervals as well as various helper functions for data formatting.

The main components are:

* Time-controlled data logging in CSV files
* Conversion of timestamps into different string formats
* Automatic generation of file names with timestamp
* Processing of column and row data
* Rounding of floating-point numbers to defined decimal places

***

### Details

| **Documentation version**      | <code class="expression">space.vars.HVACCSV\_Library\_latest</code>                                          |
| ------------------------------ | ------------------------------------------------------------------------------------------------------------ |
| **Placeholder**                | `HVACCSV`                                                                                                    |
| **Available in CODESYS Store** | *No*                                                                                                         |
| **Programming system**         | *CODESYS V3.5.17.2 or higher*                                                                                |
| **Runtime system**             | *CODESYS Control V4.2.0.0 or higher*                                                                         |
| **Licensing**                  | *Single License (single device license)*                                                                     |
| **License**                    | [HVAC Building Automation Package SL](https://store.codesys.com/de/hvac-building-process-automation-sl.html) |

***


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://support.powerio.com/hub/codesys-hvac/en/hvac-csv-library/beschreibung.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.