Creating a C# function block library

With Visual Studio®, you can program functions, function blocks, function containers and programs in C# which you can subsequently import using the PLCnext Technology engineering software, PLCnext Engineer and use on a PLCnext Technology device.

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04m:06s

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Creating a PLCnext project

Before proceeding, make sure to have the workbench prepared properly.

Then go on:

1. Create a new project
   • On the Visual Studio start-up screen select Create a new project,
     or alternatively in the Visual Studio workbench, from the top menu bar, open File → New → Project….
   •  Type in the search plcnext and double-click the Firmware Library entry appearing in the list
     Hide screenshotClick to show a screenshot

     

   • Type in your Project Name, select a storage location and click Create.
     Hide screenshotClick to show a screenshot

     

2. Enable the System namespace

   See the System namespace topic for this step.

3. Add new code sheets

   With the extension, different code sheet templates are available. All templates are very basic but working examples. They can be compiled and tested right away.

   • To add a new template right click in the Solution Explorer on your desired project.
   • Select Add → New Item….
     
   • Select in the left tree Visual C# Items → PLCnext and then one of the following templates:
     
     • Function
       Template for a C# function to be used in IEC 61131-3 code

       Hide value settingsShow return value settings

       Select a return value in the popped-up dialog:
       
       Return Type:
       For information on the data types in C# programming for PLCnext Technology and their correlations to data types in IEC 61131 or C++ programming, you can pop up the table of supported data types in an overlay window.
       Kind of Return Value:
       By Reference is recommended for complex data types and is mandatory for generic data types (ANY).

     • Function Block

       Template for a C# function block to be used in IEC 61131-3 code.

     • Function Container

       Template for a C# function container to define several IEC functions in on class.

     • Program

       Template for a C# program to be used like an IEC 61131-3 program.
       ↪ A default code sheet for the selected type of element is created.

4. Create the code
   • In the template code sheet, create the code for the function, function block, or function container 
     
   • Observe the comments in the template, and the Known Issues and Constraints section of the online help
     Here you find the online help file:Click to show where to find that

     In Visual Studio, open your C# project and expand the EclrFirmwareLibrary branch in the Solution Explorer in the upper right corner of the screen.

     

   • Create the entire project by pressing F6.
     ↪ A *.pcwlx library is being stored in either the Release or the Debug directory of the project.

Proceed with importing the library into PLCnext Engineer to use your C# function or function block in an automation project.