https://forge.codesys.com/forge/talk/Engineering/thread/8df077d933/2020-02-27T13:49:12.809000ZRecent posts to Pass a varible value from FB_A to class FB_B2020-02-27T13:49:12.809000Z2020-02-27T13:49:12.809000ZdrChiavohttps://forge.codesys.com/u/drchiavo/https://forge.codesys.com448f381bc492df80bf65290a75ee32fbc07fde23

<div class="markdown_content"><p>I see! Now is working properly.</p> <p>The problem was that the program (PRG) was missing before the instance.</p> <div class="codehilite"><pre><span></span><span class="err"> </span><span class="n">var_b1</span> <span class="p">:</span><span class="o">=</span> <span class="n">PRG_COM</span><span class="p">.</span><span class="n">InstanceA</span><span class="p">.</span><span class="n">var_a1</span><span class="p">;</span> </pre></div> <p>Thanks</p></div>

2020-02-27T13:49:12.703000Z2020-02-27T13:49:12.703000ZRolandWagnerhttps://forge.codesys.com/u/rowa/https://forge.codesys.com04bd1439b56faaff30995ded549c5561287ac64f

<div class="markdown_content"><p>It works well on my project... <br/> Please try the attached Project...</p> <p>Now I see: you have two different instances of the same FB_A.<br/> Replace the call in FB_B by this:</p> <div class="codehilite"><pre><span></span><span class="n">var_b1</span> <span class="p">:</span><span class="o">=</span> <span class="n">InstanceA</span><span class="p">.</span><span class="n">var_a1</span><span class="p">;</span> </pre></div> <p><img alt="IMG: FB_Vars.png" rel="nofollow" src="https://forum.codesys.com//download/file.php?id=1564"/></p> <p><a class="" href="https://forum.codesys.com//download/file.php?id=1565" rel="nofollow">FB_Vars.project <span><span>[133.29 KiB]</span></span></a></p></div>

2020-02-27T13:49:12.612000Z2020-02-27T13:49:12.612000ZdrChiavohttps://forge.codesys.com/u/drchiavo/https://forge.codesys.com10d7dd73f58028025835e9c105f286dad4fc96ec

<div class="markdown_content"><p>Hello,<br/> thanks for your answer. I tried already but is not working. I made a screenshot.</p> <p><img alt="IMG: Result.PNG" rel="nofollow" src="https://forum.codesys.com//download/file.php?id=1560"/></p></div>

2020-02-27T13:49:12.258000Z2020-02-27T13:49:12.258000ZRolandWagnerhttps://forge.codesys.com/u/rowa/https://forge.codesys.com09aab516b03cc5efba3f83bd8f985ed9e0ad6249

<div class="markdown_content"><p>There are several ways to do so. The easiest way would be to declare var_a1 as output of FB_A:</p> <div class="codehilite"><pre><span></span><span class="nt">PROGRAM</span> <span class="nt">PLC_PRG</span> <span class="nt">VAR</span> <span class="nt">InstanceA</span><span class="p">:</span><span class="nd">FB_A</span><span class="o">;</span> <span class="nt">InstanceB</span><span class="p">:</span><span class="nd">FB_B</span><span class="o">;</span> <span class="nt">END_VAR</span> <span class="nt">InstanceA</span><span class="o">();</span> <span class="nt">InstanceB</span><span class="o">();</span> <span class="o">...</span> <span class="nt">FUNCTION_BLOCK</span> <span class="nt">FB_A</span> <span class="nt">VAR_OUTPUT</span> <span class="nt">var_a1</span><span class="p">:</span><span class="nd">INT</span><span class="o">;</span> <span class="nt">END_VAR</span> <span class="nt">var_a1</span> <span class="o">:=</span> <span class="nt">2</span><span class="o">;</span> <span class="nt">FUNCTION_BLOCK</span> <span class="nt">FB_B</span> <span class="nt">VAR</span> <span class="nt">var_b1</span><span class="p">:</span><span class="nd">INT</span><span class="o">;</span> <span class="nt">END_VAR</span> <span class="nt">var_b1</span> <span class="o">:=</span> <span class="nt">InstanceA</span><span class="p">.</span><span class="nc">var_a1</span><span class="o">;</span> </pre></div> </div>

2020-02-27T13:49:12.173000Z2020-02-27T13:49:12.173000ZdrChiavohttps://forge.codesys.com/u/drchiavo/https://forge.codesys.com569211b648021dd834e2e8da682a1626aeef4727

<div class="markdown_content"><p>Hello,</p> <p>How can I pass a variable value from a FB_A to FB_B. </p> <p>FB_A</p> <p>var_a1 := 2;</p> <p>FB_B</p> <p>var_b1 := var_a1; ?? </p> <p>Is it possible? If yes, how?<br/> Thanks</p></div>