logi.CAD 3 is an integrated development environment by logi.cals for programming a wide variety of →PLCs (Programmable Logic Controllers). logi.CAD 3 provides comfortable editors for the IEC programming languages →ST (Structured Text) and →FBD (Function Block Diagram).

Development environment and IEC 61131-3

It is possible to create applications in logi.CAD 3 according to the industry standard IEC 61131-3. In this case, knowledge about this IEC-standard is essential (see glossary item →IEC 61131-3 for links to sources).

This user documentation is valid for logi.CAD 3 version 3.20.0.

Content of this user documentation

Where to start	Details to know
Installation instructions Tutorials The dos and don'ts when working Release notes: Release notes for version Release notes for system libraries	Reference documentation with information about the following →features: Basic user interface Project explorer and application navigator ST-editor interface editor system blocks for the application Testing, debugging and tracing the application Instance-related and PLC-related information and actions within Instances view Browsing to the objects of the application by using the Object Browser view Output of messages (Error Log/Problems) More features might be provided in your used logi.CAD 3product version. editor for PLC-object system data types for the application hardware configuration The following features are not provided in all variants of logi.CAD 3: Page:Creating application in FBD-editor Page:Creating application in LD-editor Page:Creating application in C or C++ Page:Validating an application Page:Teaming up to create applications Page:Accessing hardware IOs via EC-Master and EC-Engineer of Acontis Page:Creating custom library with user blocks Page:Testing single POUs by using the test framework Page:Command line interfaces Page:Local variants for library elements Page:Migration Page:Creating the interface in the interface editor Page:Visualization for application
Good to know	Legal information
IEC-compliance Keyboard shortcuts Troubleshooting and FAQ Glossary	Copyright notes License agreement for IDE Contact information

Getting support and help

If you cannot find the requested information in this user documentation at all, contact the support team of logi.cals.

Up-to-date informationen within online-version

Please check the online-version (provided under http://help.logicals.com/) whether new pieces of information have been added since this user manual (as PDF/HTML/Word) has been published; e.g. the release notes quote new problems or there are new articles in the troubleshooting- or FAQ-section.
The online-version of the release notes for logi.CAD 3 is available under: https://help.logicals.com/lco3docu/latest/user-documentation/de/release-notes-fuer-version – Use the version picker (above the table of contents) to switch to the relevant version of logi.CAD 3.

Typographical conventions

The following conventions are applied within this documentation in the interest of improving readability:

Bold	names of commands, buttons etc. within logi.CAD 3 and/or emphasizing important text passages Example: menu File, button Finish
Italics	variable information in a term Example: logiRTS_Vx.y.z_name.tar.gz → x.y.z and name are examples of variable information.
`Monospace`	files/folders, user input or output of logi.CAD 3 Example: ST-Code `up : BOOL;`
→term	reference to glossary item Example: →target system Usually, the reference is given at first occurrence of the term in the article.

Hints in this documentation are presented as follows:

Title of a warning

This is a warning that the reader/user must know/observe for fault prevention and/or detection. This hint is used for restrictions, limitations, deviations or similar.

Title of a note

This is a note that the reader/user should be aware of. This hint is used for important information. Knowing the note helps to avoid problems during an operation.

In addition, the symbol is used to indicate important information. The symbol is usually used in paragraphs, bulleted lists and/or numbered lists.

Title of an information

This is a piece of information that the reader/user should know. This hint is used for helpful information that helps the user to understand the operation (e.g. of a function).

In addition, the symbol is used to indicate helpful information. The symbol is usually used in paragraphs, bulleted lists and/or numbered lists.

Good to know

This is a piece of background information about the current function or information pointing out additional functions/features in the context of the current function. Usually. such a piece of information appears at the end of a description or after a bulleted or numbered list.

References in the PDF file are enhanced by the text "(→P#)" with # being the number of the page where the appertaining description starts.
Example: Tutorials