What is this icon?

[David_Grucza]

I'm going over the example CLD-R tests. This is part of one of the sample questions, and I have no idea what the icon in the for loop is. 

[altenbach · Accepted solution]

It is a feedback node with the delay set to 3 in properties.

[Michael_Munroe · Accepted solution]

It is the Feedback Node and operates like a shift-register inside a for loop (LV Global Variable).  You can right-click and change the direction for convenience.

Feedback Node

[David_Grucza]

Thanks for the answers. I didn’t realize that it was a feedback node. It looks different than I remember. Did NI add functionality in the last 10 years? I never really found a reason to use one, obviously.

[altenbach]

The picture is very old, as we can tell from the boolean constant.

By default it looks different, because the enable terminal is hidden.

[David_Grucza]

Yes, NI hasn’t updated the practice tests in a very long time. I forget when they changed the Boolean constant.

[altenbach]

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@David_Grucza wrote:

I'm going over the example CLD-R tests. This is part of one of the sample questions, and I have no idea what the icon in the for loop is. 

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On a side note, this is just a silly problem akin to a "togue twister", with no practical real-world use. Nobody goes to the extra step of showing the enable terminal, then hardwire it to a TRUE constant. Nobody ever uses a delay of more than one, except maybe on FPGA. Even a CLA would never write code like that. The code can be replaced by a plain array diagram constant having the desired result.

[David_Grucza]

I think most of the motivation behind the CLD-R is to motivate developers to catch up on all of the new features. Many I don't have a need for, but I should still know they are there.