https://forge.codesys.com/forge/talk/Engineering/thread/9b8e58453e/2020-02-27T14:34:42.119000ZRecent posts to VAR_OUT Variable2020-02-27T14:34:42.119000Z2020-02-27T14:34:42.119000ZAnonymoushttps://forge.codesys.com/u/*anonymous/https://forge.codesys.com19661d1bdd7173b47e49c6350c0316026f69cf2d

<div class="markdown_content"><p><em>Originally created by:</em> scott_cunningham</p> <p>It could be - depending on if there is other code that sets the variable. In general, VAR_OUT simply means it's a variable that can be read outside of the POU and cannot be written. It certainly can be assigned as an input to some internal code.</p> <p>Here is a post I just made that uses a VAR_OUT (Output) as an input to a FB (PulseTimer) inside my POU: l <a class="" href="http://forum.codesys.com/viewtopic.php?f=2&amp;t=6856&amp;p=14739&amp;lan=en" rel="nofollow">viewtopic.php?f=2&amp;t=6856#p14739</a> l </p> <p>VAR_INPUT = variable the POU can use that is set externally (i.e. TON(EN:=TRUE) ... EN is an input variable)<br/> VAR_OUTPUT = variable the POU can use and set that is visible externally (i.e. TON(Q =&gt; Done) ... Q is an output variable)<br/> VAR_IN_OUT = variable the POU can use and set that also can be set externally (so both the POU and user code can change it)<br/> VAR = internal variable to the POU that is NOT visible externally (only visible in debug mode)</p></div>

2020-02-27T14:34:41.634000Z2020-02-27T14:34:41.634000Zsuibafhttps://forge.codesys.com/u/suibaf/https://forge.codesys.com434704d8bba4dadcb1228d78e658aa28c50bdb69

<div class="markdown_content"><p>I have to say: I have copied this code. My question is conceptual.<br/> What is your opinion? sReceive is VAR_OUT variable?<br/> Thank you very much.</p></div>

2020-02-27T14:34:40.201000Z2020-02-27T14:34:40.201000ZAnonymoushttps://forge.codesys.com/u/*anonymous/https://forge.codesys.comf3ff4073cd268b75a7095f1513144a31383bf920

<div class="markdown_content"><p><em>Originally created by:</em> scott_cunningham</p> <p>If you used the auto declare functionality, the cursor starts in the variable type and you can accidentally change it from VAR to VAR_IN or VAR_OUT. I have done this a few times myself. Just change it to the required type you need.</p></div>

2020-02-27T14:34:39.674000Z2020-02-27T14:34:39.674000Zsuibafhttps://forge.codesys.com/u/suibaf/https://forge.codesys.com08d375d32d99408a2eaab50a84200d64d8f77480

<div class="markdown_content"><p>Hi as you can see,</p> <p>the variable sReceive in fbUdpR is a input variable. Why in declare section is a VAR_OUT variable?<br/> Best Regards</p> <p><img alt="IMG: ScreenShot.jpg" rel="nofollow" src="https://forum.codesys.com//download/file.php?id=1793"/></p></div>