Count number of times an analog input happens?

[Ralph@NES]

Seems that decreasing the 'wait' in the loop helps.

Would there be any benefit to making this into a subvi to run in a larger loop?

[GerdW]

Hi Ralph,

- your loop timing determines the sampling speed. You cannot detect pulses with lower switch time than your sampling time. Fundamental data aquisition knowledge...

- you can put that into a subVI. That doesn't change the behaviour, but makes the (main VI) block diagram nicer

[Ralph@NES]

In use as a subvi, one wouldn't want a while loop, would you?

If not, how do you handle the shift registers...  Make them inputs and outputs of the subvi and run them through the main loop?

[GerdW]

Hi Ralph,

you can do your task without shift registers: use feedback nodes instead 🙂

When you create a subVI you should think/learn about reentrancy and it's (ab-)uses!

[Ralph@NES]

Oh neat.

I'm a hack so all help is appreciated.

[Ralph@NES]

Hmm.

Made it into a sub, trying to run two separate instances and they're behaving oddly.  Just running away and no distinct control.  Do I need to add error in and out to 'sequence' the subvis?

[GerdW]

Hi Ralph,

did you read that last sentence of message #14? It's important and I wrote it for a reason...

You really should know what you're doing when you create programs. RTFM! Learn the basics!

[Ralph@NES]

I took all three courses five years ago and knew everything pretty well then, it's been a couple of years.

If I don't ask, how will I know?

[Ralph@NES]

OK, I set the Execution properties for the sub vi to Reentrant with preallocate for each clone and the functionality seems to be there.

Glad I had this conversation, because I have some VI's with multiple calls of the same vi that are very, very large and I had been using the error handler to sequence the subvi's.  This was causing some major slowness in the operation.  As a result of this conversation, I believe I can go fix things that have been bothering me for years.

The classes didn't really cover reentrancy.  This is all new to me.  Thanks.