Parallel loops & data logging

[Epictitus]

Hi all,

I am new to labview and to this forum. If my questions have been answered before, or if there is a better spot to post them, please let me know.

I am logging some load bridges and displacement values to calculate density changes with increasing normal loads. Normal load values are then sent to a PLC via modbus for control purposes. I have some questions around speeding it up and parallel loops in particular. In the concept image below, would my logging loop and processing loop run in parallel or am I killing that functionality with Loop 1?

Full .vi is attached (missing some sub vi's) if that helps clearing things up.

Thanks for your input!

[RTSLVU]

That wont work because a Queue can have many Enqueue but only have one Dequeue.

You basically have a race condition because once you dequeue an element from the queue it's gone.

So the first loop to dequeue gets it but the other loop will never see it.

[Epictitus]

Thanks for the pointer. I am currently enqueueing in the logging loop and dequeueing in the processing loop. That part works fine, am I missing anything there? Mostly I am not sure if my loops can run in parallel, and if not how to create parallel loops that can be called multiple times.

[thols]

These are pretty basic and generic questions. If you post your actual code we can give more specific answers. 

Whenever I need to send data between parallel loops, I nowadays do something like this. More on Channel wires here.

[RTSLVU]

---

@Epictitus wrote:

Thanks for the pointer. I am currently enqueueing in the logging loop and dequeuing in the processing loop. That part works fine, am I missing anything there? Mostly I am not sure if my loops can run in parallel, and if not how to create parallel loops that can be called multiple times.

---

Well... In your concept it looked like you were splitting a Queue and sending it to two Consumer loops. That won't work because of the reason I gave.

I have found that I can combine my processing, logging, and display into one loop. Who cares if the logging gets behind?

I took a quick peak at your  code and I think your architecture is not good and adding more parallel loops is not going to fix it.