Create different arrays via a trigger from an AI

[ChrissyC]

Hi,

I'm trying to figure out how to implement a trigger into my program. I basically want this to happen:

Psuedocode:

if (AI2 = 3V)

        write data from AI1 to graph 1

if (AI2 = 4V)

        write data from AI1 to graph2

else

        do not write data to anywhere

I had thought of a case structure, but realised that not all of the outputs would be wired.

The problem with my VI is that the DAQ is reading from 50 channels  - would it be easier to try and create two separate arrays in the producer loop and then read from them separately in the consumer loop

OR to create a single array in the producer loop and then try to split the data in the consumer loop?

or is there a better way altogether?

Here's the VI as i'm working on it. I've stripped out a lot of the program that does other things (LED control, Digital input recording etc.)

[CharlieRodway]

Hi,

I would avoid processing the measurements into two seperate arrays within the producer loop, as this may impact on the timing of your measurements.

I haven't been able to open your VI (I still haven't installed LabVIEW 9 yet!) but I've knocked up a quick example of how you could queue a single array in the producer and split it out in the consumer:

Hope this helps,

Charlie

[Broken_Arrow]

Why can't the graphs be put inside two different cases which are triggered when one = 3 and the other = 4?   What outputs are you talking about?

Secondly, why graph a straight line?

[CharlieRodway]

Hi Broken Arrow,

Yep, just realised my mistake - I was originally building arrays in the consumer to add to graphs, but then changed to charts.

Corrected:

Thanks,

Charlie

[ChrissyC]

Cheers for the help Charlie, sorry but i thought that who ever would look at the post would also see the VI! 

Below are the consumer and producer loops of my VI. Originally i needed to produce 2 graphs in the word report which contained data from 2 separate AIs.

Now i want to use the integer value of the middle array (which goes to the max/min in the picture) to send only one array (the top one) to either graph 1 or graph 2 in the report. (the bottom array will now not be used at all).

Thanks for any help you can give,

Chris

[CharlieRodway]

Hi Chris,

I think I'm beginning to understand your dilemma now...

If you wire the top array through the case structure to either graph 1 or 2, then the output to the other graph will be unwired.  Is this correct?

I'm not sure you can achieve what you want with on-the-fly reporting.