Add multiple simultaneo​us data sources to Continuous Measuremen​t and Logging Template

I am looking at using the  Continuous Measurement and Logging sample project as a starting point for my project.  The template shows the use of a single data source at a single rate.  In my case I have multiple data sources that will arrive at different rates and need to come together and be logged to the same file with the fastest arrival dictating the log entry and the slower data would be their last values.  It is a slow data collecton process ranging from 1 second to around 10 second sample rate.  More of a monitoring application with logging than a data aquisition application. Since the waveform data type is base-t  plus delta-t and my data arrives at varying rates, my first task would be to remove the use of it and define a typedef for my data. I would use a single logging message loop, but what approach can anyone recommend for the aquisition?  I imagine separate aquisition message loop vis for each data source but what about placement?  Placing them all at the top level vs placing them within a the existing aquisition message loop vi? Any other thoughts or recommendation are appreciated.  Thanks in advance!

if you want to sample one channel at 10/s and an other one at 1/second....  How is your file going to look like?  Does this mean that for the slower channel you just want to keep the same value for the other 9 values?
The sampling speeds that you are talking about are really slow.  It would certainly not hurt your hardware to sample eacht channel with the same speed.  And it you really just need one sample every 10 second, you can always decimate you array of values.
For instance :
channel 1 : 1 point per second (sample ratio) => 10 points in 10 seconds
Channel 2 : 1 point per 10 seconds => 10 points per 10 seconds (same sample speed) => decimate array (keep 1+/10 values) => 1 point per 10 seconds
This is going to be the easy way, or you want to start with parallel loops running, but that's "not that simple" anymore
Kind regards,
- Bjorn -
Have fun using LabVIEW... and if you like my answer, please pay me back in Kudo's
LabVIEW 5.1 - LabVIEW 2012

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    Solved!
    Go to Solution.

    Here's what the idle state case within the stop message case looks like:
    We don't hang the CPU handling a constant stream of no-op messages because we only enqueue "Log" messages when we are in the valid logging state (the Idle state here is again a passthrough).
    The worst case scenario is that there are number of Log requests already in the queue when the system stops. Upon recieving the Stop message the state transitions to idle and the remaining Log messages become no-ops due to the state.
    I will look into the feasibility of posting some updated VIs.
    ~Simon

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