Using subVI as control?

[altenbach]

---

@prettypwnie wrote:

And yeah, it's a functional global not a global variable.

---

In addition, "global" implies just that, so once the subVI is preallocate/reentrant, there is nothing "global" about it. Each subVI instance has it's own sandbox. (... which we want in this case, of course!)

Action engines and functional globals are typically non-reentrant so the data can be shared globally.

Semantics. 😄

[prettypwnie]

Yeah, I tend to always say functional global when referring to an uninitialized shift register, but you're right, its a bit misleading to say it's "global" when it has pre-allocated reentrancy.

[altenbach]

---

@altenbach wrote:

You can handle all possible state transitions by creating an array with four elements (the current boolean values and their previous value from a feedback node), converting it to a number (boolean array to number) and wiring the number to a case structure.

---

Here's a quick example. Notice that the logic is now MUCH simpler than yours. 😄

 

(please verify correct operation. It would be easy to implements the logic into a subVI using the references as mentioned already).

[altenbach · Accepted solution]

---

altenbach wrote:
It would be easy to implements the logic into a subVI using the references as mentioned already.

---

Here's an example for that.

[RaymondLo]

@altenbach

Thanks! This does seem much nicer. I am sticking with what I had because it's working and it's a subVI so it doesn't really mess with the main BD, but this is definately a much nicer way to handle the boolean logic and I will keep an approach like this in mind next time I try and do some boolean binding.

Best,

Ray