https://forge.codesys.com/prj/codesys-example/visu-value-chan/home/Home/Recent changes to HomeenMon, 28 Sep 2020 13:24:52 -0000https://forge.codesys.com/prj/codesys-example/visu-value-chan/home/Home/<div class="markdown_content"><pre>--- v1 +++ v2 @@ -1,7 +1,28 @@ -Welcome to your wiki! +[[download url=https://forge.codesys.com/svn/prj,codesys-example,visu-value-chan,code/VisuValueChangeHandler.project label=project]] -This is the default page, edit it as you see fit. To add a new page simply reference it within brackets, e.g.: [SamplePage]. +[TOC] -The wiki uses [Markdown](/prj/codesys-example/visu-value-chan/home/markdown_syntax/) syntax. +# Visu Value Change Handler Example +The sample project records variable value changes that were triggered by user input within the visualization. -[[members limit=20]] +## Product description +All visualization elements that change the value of a variable by user input call the ``IValueChangedListener`` interface. +With this interface, the value changes can be recorded and then processed programmatically. + +**Sample project "VisuValueChangeHandler.project":** + +The function block ``FB_ValueChangedListener`` implements the interface ``IValueChangedListener``. +In the ``PLC_PRG`` program, the function block is registered at ``ValueChangedListenerManager``. When the value of a +visualization element changes, the ``ValueChanged`` method of the ``FB_ValueChangedListener`` function block is called. +In the sample project, all user inputs are written via the visualization to the log file of the device. +The corresponding visualization element can be selected using the input assistant. + +## System requirements and restrictions +|System requirements and restrictions | Info| +| --- | ----------- | +|**Programming System** | CODESYS Development System Version 3.5.14.0 or higher| +|**Runtime System** | CODESYS Control Version 3.5.14.0| +|**Required Accessories** | -| + + +[[project_screenshots]] </pre> </div>mlampMon, 28 Sep 2020 13:24:52 -0000https://forge.codesys.com4d0cffc60e84e775251a464e1d10b10b19a91517https://forge.codesys.com/prj/codesys-example/visu-value-chan/home/Home/<div class="markdown_content"><p>Welcome to your wiki!</p> <p>This is the default page, edit it as you see fit. To add a new page simply reference it within brackets, e.g.: <span>[SamplePage]</span>.</p> <p>The wiki uses <a class="" href="/prj/codesys-example/visu-value-chan/home/markdown_syntax/">Markdown</a> syntax.</p> <h6>Project Members:</h6> <ul class="md-users-list"> <li><a href="/u/ingo/">Ingo</a> (admin)</li><li><a href="/u/mlamp/">mlamp</a> (admin)</li><li><a href="/u/robert/">robert</a> (admin)</li> </ul> </div>mlampMon, 28 Sep 2020 13:20:36 -0000https://forge.codesys.com1a7070b7552196f2ee3980147a6815b805e77cd8