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Collection of various C++ sample code for PLCnext Technology controllers.

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# PLCnext Technology - CppExamples

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The [CppExamples](https://github.com/PLCnext/CppExamples) repository is a collection of various sample code for PLCnext Technology controllers. 
It is assumed that the reader has basic know-how of C++ programming and has read the key parts of the [PLCnext Technology Info Center](https://www.plcnext.help/).  
Each example explains one or more topics on how to use C++20 with PLCnext Technology. Explanations are given in the *README.md* document and via comments in the example code. 
Each example holds separate user components which can be instantiated on a *PLCnext Control* device.

This project aims to supply, over time, examples and best practices of PLCnext Technology functions regarding C++20.

**IMPORTANT NOTE: All the examples on this `master` branch of this repository have been updated to work with firmware versions 2025.0 and later. These examples may not compatible with firmware versions earier than 2025.0. Examples for earlier firmware versions are located on the `Pre-2025.0` branch.**

## Table of Contents

|\#| Topic | Content | SourceCode
| ----- | ------ | ------ |------
|[01](Examples/E_Learning_InternalFunctionExtensions/)| [E-Learning: InternalFunctionExtensions](Examples/E_Learning_InternalFunctionExtensions/README.MD)| This describes how to use the Internal Function Extensions.| [SourceCode](Examples/E_Learning_InternalFunctionExtensions/src/)
|[02](Examples/CppDataTypeTest/)| [Data Type Exchange Example](Examples/CppDataTypeTest/README.md)| This example shows how to transfer data from a C++ project to the GDS by declaring *Port variables* in C++. Variables published to the GDS can be accessed by other programs (IEC/C++/Simulink/C#) or the IOs| [SourceCode](Examples/CppDataTypeTest/src/)
|[03](Examples/DynamicPorts/)| [Dynamic GDS ports example](Examples/DynamicPorts/README.md)| This example shows how to create and use dynamic GDS ports on a C++ program.| [SourceCode](Examples/DynamicPorts/src/)
|[04](Examples/ComponentPorts/)| [ComponentPorts](Examples/ComponentPorts/README.md)| This example shows how to initialize ComponentPorts using PLC events like Cold/Warm/Hot-Start similar to ProgramPorts. |[SourceCode](Examples/ComponentPorts/src/)
|[05](Examples/ProgramComponentInteraction/)| [Program Component Interaction](Examples/ProgramComponentInteraction/README.md)| This example shows two *programs* interacting with a *component* by getting or setting variables through reference.| [SourceCode](Examples/ProgramComponentInteraction/src/)
|[06](Examples/ThreadExample/)| [Thread Example](Examples/ThreadExample/README.md)| This describes how to implement Threads in a component of C++ project.| [SourceCode](Examples/ThreadExample/src/)
|[07](Examples/BufferedExchange/)| [BufferedExchange Example](Examples/BufferedExchange/README.md)| This example shows how to communicate larger amounts of data between a Program and a Component and how to process these data using a Thread|[SourceCode](Examples/BufferedExchange/src/)
|[08](Examples/DeviceInterface/)| [Device Interface Example](Examples/DeviceInterface/README.MD)| This example shows how to read and write device settings etc. using the four Device Interface RSC services.| [SourceCode](Examples/DeviceInterface/src/)
|[09](Examples/BrowseVariables/)| [Variable Browsing Example](Examples/BrowseVariables/README.MD)| This example shows how to query the structure of the Global Data Space (GDS) by using the Variable Browse service to read variable metadata.| [SourceCode](Examples/BrowseVariables/src/)
|[10](Examples/DataAccess/)| [Data Access Example](Examples/DataAccess/README.MD)| This example shows how to read and write GDS variables using the Data Access service.| [SourceCode](Examples/DataAccess/src/)
|[11](Examples/Subscriptions/)| [Subscription Example](Examples/Subscriptions/README.MD)| This example shows how to read GDS variables using the Subscription service.| [SourceCode](Examples/Subscriptions/src/)
|[12](Examples/Force/)| [Force Example](Examples/Force/README.MD)| This example shows how GDS variables can be forced using the Force service.| [SourceCode](Examples/Force/src/)
|[13](Examples/NotificationExample/)| [Notification Example](Examples/NotificationExample/README.MD)| This example shows how to use the Notification Manager.| [SourceCode](Examples/NotificationExample/src/)
|[14](Examples/TraceControl/)| [Trace Control Example](Examples/TraceControl/README.MD)| This example shows how to use the Trace Controller service.| [SourceCode](Examples/TraceControl/src/)
|[15](Examples/ProfinetConfig/)| [Profinet Configuration Example](Examples/ProfinetConfig/README.MD)| This example shows how to use the Profinet Configuration service.| [SourceCode](Examples/ProfinetConfig/src/)
|[16](Examples/FileStreamExample/)| [Commons::Io::FileStream Example](Examples/FileStreamExample/README.md)| This Example shows how to use a File Stream to check the binary generation timestamp whenever a Component is reinitialized.|[SourceCode](Examples/FileStreamExample/src/)
|[17](Examples/IncludeOpenSourceLibrary/)| [Include an Open Source Library](Examples/IncludeOpenSourceLibrary/README.md)| This describes how to use a third-party open-source library in a C++ project that is built for PLCnext Control using Eclipse|
|[18](Examples/OpcPlcManager/)| [OPC UA Methods](Examples/OpcPlcManager/README.MD)| This example shows how to use OPC UA methods to execute functions in an ACF component written in C++.| [SourceCode](Examples/OpcPlcManager/src/)
|[19](Examples/NoEngineer/)| [PLM/ESM/GDS Configuration without PLCnext Engineer](Examples/NoEngineer/README.MD)| This example shows how to configure C++ programs to run on a PLC without using PLCnext Engineer.|
|[20](Examples/IoComponentExample/)| [I/O Component Example](Examples/IoComponentExample/README.MD)| In this example, a simple I/O (fieldbus) Component is created and deployed.|

## Getting started

- [C++ programs in PLCnext Technology](https://www.plcnext.help/te/Programming/Cplusplus/Cpp-programming.htm)
- [Required Installations for C++ programming](https://www.plcnext.help/te/Programming/Cplusplus/Cpp_Required_installations.htm)
- [Working with Eclipse](https://www.plcnext.help/te/Programming/Cplusplus/Working_with_Eclipse.htm)

## Compiling an example

There are different ways to build your code:

### Compile the code with the PLCnext Technology Toolchain

1. Install Eclipse IDE, CLI, SDK and Eclipse Add-in (how-to guide: see links in the "Getting started" section above)
1. Clone this repository
1. Navigate to the project you want to test, e.g. `cd Examples/ProgramComponentInteraction` 
1. Execute `plcncli new project -c DummyC -p DummyP && ls -la src && rm src/Dummy*` or `plcncli new acfproject -c DummyC && ls -la src && rm src/Dummy*` for acf projects
1. Execute `plcncli set target --add --name AXCF2152 --version 2024.7` to specify details of the build target
1. Execute `plcncli generate all` to generate intermediate code and Config files
1. Execute `plcncli build` to build the code.
1. Execute `plcncli deploy` to generate a *.pcwlx* file that can be included in PLCnext Engineer

### Compile using the Eclipse Add-in

1. Create a new empty project named like the example you want to test
1. Remove the source files located at `ProjectName/src`
1. Move the source files from the example you want to use into your workspace at `ProjectName/src`
1. Build the project

### Compile using [build.sh](tools/build.sh) script

1. Clone this Repository
1. Modify the [build.sh](tools/build.sh) script to fit your needs
    1. select hardware
    1. select project
    1. rename folder to fit namespace name (e.g. mv Examples/OpcUaMethodExample Examples/OpcPlcManager)
    1. switch between `acfproject` and `project` command if necessary
1. Make sure it is executable for example with ```chmod +x tools/build.sh```
1. Execute the script ```./tools/build.sh``` or  ```sh tools/build.sh ```

## Contributing

You can participate in this project by submitting bugs and feature requests.  
Furthermore you can help us by discussing issues and letting us know where you have problems or where others could struggle.

## Feedback
* Ask a question in the [PLCnext Community Forum](https://www.plcnext-community.net/forum/#/categories)
* Request a new feature or example to be added on [GitHub](CONTRIBUTING.md)
* Vote for [Popular Feature Requests](https://github.com/PLCnext/CppExamples/issues?q=is%3Aopen+is%3Aissue+label%3Afeature-request+sort%3Areactions-%2B1-desc)
* File a bug in [GitHub Issues](https://github.com/PLCnext/CppExamples/issues)

## License

Licensed under the [MIT](/LICENSE) License.

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