Initializing a variable once on the RT side of a RIO

[rscott9399]

Having trouble initializing a flip flop VI i wrote

It starts up in whatever state it wants. 

 

How can i force a particular state?

Its just an SR latch

 

Thanks in advance 

 

[infinitenothing]

Initialization behavior is well defined in the settings of the feedback node.

https://zone.ni.com/reference/en-XX/help/371361L-01/lvconcepts/block_diagram_feedback/

I'm not sure what you mean by force. Are you trying to make it into a d latch?

[rscott9399]

Hi there, Thanks 

So when i wrote the VI i notices it automatically populated a feedback node

If i tried to delete it , i could not compile. 

So the feedback node is my answer but need to understand how to use it. 

I know my Q output to initialize to false and my Q not to be high

I will read the link you sent me. Thank you

 

[rscott9399]

My only other issue is, I am triggering my Latch reset with a falling edge trigger.

 

The clock that is running the latch is only running at the speed of a while loop. 

It is causing me to miss the falling edge sometimes. Do you have any suggestions

Thanks

Setting the Feedback node like this to false did not work

I need to find a way to guarantee it

 

Edited May 16, 2019 by rscott9399

[infinitenothing]

If you don't want to use a feedback node, another option is using a local variable (see example below)

It sounds like you're trying to process losslessly. If that's the case, you usually need some sort of buffer. In this example, I use the event queue as my buffer.