https://forge.codesys.com/forge/talk/Engineering/thread/3aaf05a954/2020-02-27T13:49:49.350000ZRecent posts to Properties displayed twice with extended function blocks and interfaces2020-02-27T13:49:49.350000Z2020-02-27T13:49:49.350000Ztvmhttps://forge.codesys.com/u/tvm/https://forge.codesys.combde8db6434ee7465186427809fe47b0b527757ec

<div class="markdown_content"><p>Interesting. It turns out that when you clock "Implement Interfaces" on a function block, it automatically creates all properties, including ones from base function blocks. I assumed that that was how it was supposed to be, but it looks like if you do that, you'll get the issue I was having.</p></div>

2020-02-27T13:49:49.215000Z2020-02-27T13:49:49.215000Ztvmhttps://forge.codesys.com/u/tvm/https://forge.codesys.combbd374ef2e116066373d8ea27b411c6df20dc7d4

<div class="markdown_content"><div class="codehilite"><pre><span></span><span class="n">INTERFACE</span> <span class="n">Interface1_ITF</span> <span class="o">//</span><span class="k">contains</span> <span class="n">properties</span><span class="p">:</span> <span class="n">Prop1</span><span class="p">,</span> <span class="n">Prop2</span> <span class="n">INTERFACE</span> <span class="n">Interface2_ITF</span> <span class="o">//</span><span class="k">contains</span> <span class="n">properties</span> <span class="n">Prop3</span><span class="p">,</span> <span class="n">Prop4</span> <span class="k">FUNCTION</span> <span class="n">BLOCK</span> <span class="n">FB_1</span> <span class="n">IMPLEMENTS</span> <span class="n">Interface1_ITF</span> <span class="k">FUNCTION</span> <span class="n">BLOCK</span> <span class="n">FB2</span> <span class="n">EXTENDS</span> <span class="n">FB1</span> <span class="n">IMPLEMENTS</span> <span class="n">Interface2_ITF</span> </pre></div> <p>My question is, when I go online with a project, in FB_2 I will see the properties from the first interface twice<br/> Prop1<br/> Prop2<br/> Prop1<br/> Prop2<br/> Prop3<br/> Prop4</p> <p>I don't understand why. I should see Prop1 and Prop2 because FB_2 is extending FB_1, and I should see Prop3 and Prop4 because it's implementing Interface2_ITF. Why are Prop1 and Prop2 shown twice?</p> <p>thanks</p> <p>Tim</p></div>