Propagate data point to multiple consumers? I'm probably overcomplicating this.

Please see the attached screencap.
The DAQ assistant in the first case structure is taking a lot of measurements from a local cDAQ chassis. One of those data points (#15) needs to be extracted (hence the select signals) and then merged with the signals from three remote (ethernet connected) chassis.
The issue that I'm having is that the data point, due to the fact that the chassis and consumers aren't running in any specific order or sync, sometimes just isn't there when the consumer loops run and it reads a 0 rather than the value. This causes the test stand to think it lost hydraulic pressure and call for a shutdown.
I'm aware someone will tell me to wire the error from each DAQ assistant to the next, but that creates a massive 6.5 second loop time, which is unacceptable. The chassis have to remain independent to keep execution time down.
I'm looking for a way to 'catch' that #15 data point and hold it for the consumers to use until the next iteration where it is replaced with the new value. I'm not sure if Collector is what I'm looking for, or some sort of data copy, or a register. If this was a PLC I'd know what to do with it.
Thanks in advance.
Still confused after 8 years.
Solved!
Go to Solution.
Attachments:
lostpoints.jpg ‏246 KB

As I see you are using LV in a wrong way. Why don't you run the DAQ tasks in independent while loops? You could use the same Queue, and you can add time stamps to every data package (or also a label to show the source) created in the several Producer loops. In your single Consumer loop you can just decide what to do with the data depending on the label (save to File,etc...).
Other big problem: do not use DAQ Assistant! It is OK for quick testing, but not for real application! These Express VIs initializes and closes your hardware at EVERY while loop iteration.
You should use proper DAQmx VIs: initialize your HW resources BEFORE the while loop, do your DAQ inside the loop, and close HW components when you stop the application.
There are many examples shipped with LabVIEW, have a look how to use DAQmx VIs. Also, this way you avoid the silly dynamic data wires...Much easier to live with Double arrays

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Tohatsu,
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Message Edited by Jhoskins on 01-30-2008 09:17 AM
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