AEs/Single/data queues the value element references

I'll have my CLD exam in December, and I'm just trying to 'inflate' as much as info that I can of course of the forum, alongside the preparation of the material...

I also started to read "nuggets" pleasant and interesting too, and I hope I can get clarification for some of my issues that have emerged. (Sorry if I have a question is too noobish, trying to practice for the CLD beside my regular daily workload, and I am a little slow thinker in the night )

I use often FGVs (and ActionEngines) in my applications, and for some "surfing and learning' on the discussion forum, OR I found this post:

http://goo.GL/Cz1d0p

People here recommended that the OP could use screws of wrapper which method has 2 benefits, explained here:

"Wrap".

http://goo.GL/J4vEIE

My 1st question:

I'm not really sure of what means a VI wrapper? Is this a Subvi, where the certain Subvi AE is called dynamically? I couldn't find examples showing how do (I read the entire post, but the subsequent discussion was more about OBJECT oriented programming...)

2nd question:

In the second post of nugget of community, there are a few closing notes, one of them: "AEs do not need a while loop." I thought AEs must also use a shift uninitialized register to store information (such as FGVs), and I need a while loop to have the shift register... Isn't it?

question 3:

I fall into the usual dangerous trap, jumping through different related posts, and try to understand everything at the same time but I wonder if there is a kind of basic example, which shows the three solutions (ActionEngines, SingleElementQueue, refs value data) for the same task?

Thanks a lot for the explanation!

PS: Sorry for using google URL shortened, but the forum of the site gives me error (Please enter a valid url) when I try to paste the normal URL...

Martins wrote:

question 3:

I fall into the usual dangerous trap, jumping through different related posts, and try to understand everything at the same time but I wonder if there is a kind of basic example, which shows the three solutions (ActionEngines, SingleElementQueue, refs value data) for the same task?

The single line of the element should not be used anymore.  Its purpose has been simplified with the value of data reference.  The concept between the two is exactly the same (reference to a single piece of memory that is locked when read until edited and rewritten in it).  The DVR uses only the Structure of the elements in Place to include the action-Edit-reading where the SEQ relied on the writer is smart enough to actually write data in the queue.

I like the Action engines.  They are simple and keep everything in one place.  Read you from a register of offset (or feedback node), do whatever it takes with it and rewrite in the shift register (or feedback node).  The fact that it is inside a non-reentrant VI acts as your lock.

I personally only used once a DVR in a real project and it is only to take care of some composition in my-oriented configuration object (several necessary items to refer to another shared object).  Otherwise, he has been driving Action all the way for me.

Tags: NI Software

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