Error 200303 - coordination of DAQ devices

I ran into a problem with my .vi where I think several physical channels or my limited understanding of the call loops.

I've only been using LabVIEW since on November, and most of what I've learned is blunt force knowledge, so hopefully you can see what is happening in my code. Basically, I read in two encoder to measure the movement of a machine. At the same time, I want the .vi to 'watching' the encoder to understand when the device is moved from a specific distance (say 1 mm) and then read in a sample from a continuous string of tensions (I simplified the code for that matter) so that we have a measure for this point.

Previously, I had the encoders the two reading in via the DAQ Assistant and the measure of distance and the measure of angle in the code were both working. I changed using the DAQ subVIs because I thought that I needed so that I could remove another instance of the physical channel for Encoder 1 (considered as a local variable in the file). I then added the loop timed to try to tinker with it to use it as the moment the measurement. I'm sure you can figure out how I've got that put in place.

I'm not sure that this approach works, but it was my best bet. I get an error that I looked and seems to deal with the fact that the cards of the M Series DAQ cannot make calendar, but I'm not entirely sure what it means. Can someone give me please a more detailed explanation on what is happening? Don't forget, I did do that, but I want to know how it really works.

Thank you



I guess I don't know why you use a loop timed for that.

If I understand you correctly, you want to allow the encoder (the counter) reach a certain number, then read in an analog voltage.  Why not just watch the meter until you reach your number and then use a case either read your blood pressure (counter is the exact number) or no (counter isn't exact number)?

A bit like this:

Also, have you looked at counter provided with LabVIEW examples?  (Help for the...) Find examples... Material input and output... DAQmx... Counter measures... Position) there are some examples that show how to read a post of an encoder quadrature you might find interesting.

As for your problems with your original code, my best guess why you can't make your counter, work with your task of timed loop tasks are because you have two counters configured as inputs (so you can count the edges), but then you try to use one of them as an output (i.e. a source for your timing loop) at the same time.  I'm sure that's not possible.  A meter must be either an input or output... it can not be both.

I hope this helps.

Tags: NI Software

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