To find the slope to a section of waveform data

I'm a newb labview is currently working on a program that controls the movement of a cylinder of air through valves and solenoid valves and collects / process generated data. He seems to have understood most of the messages in the forums by reading and watching various example problems but I'm faced with a section of the processesing of data.

Is attached a screenshot that contains the Panel before the VI with a sample of typical data, the schema-block VI main concern and the block diagram of the sub section vi that I fight with. If you look at the data, the blue line is the voltage signal in a pot in the cylinder which gives me the position, the red trace is a reading of a load cell and green is a continuinty measure that indicates when the elements I'm pulling was separated.

I want to be able to do in the processesing data is to determine that the slope of the blue line (the speed of the cylinder) to the instantaneous continuity is lost along with the maximum value of the reading load cell in a window at this time. I have a DAQmx task configured to trigger a signal of 1 in rising edge on the cylinder and collect a sample over 250 points to 5 kHz. The daqmx read in the loop is set up to take a sample waveform when it is available and survey it. The second loop is configured for deque this table of 3 waveforms and post it on a chart, process the data and write the data to a text file.

One of the things I noticed in testing this VI is that data seem to be in a unique dequed of data point at a time (or plotted at least that it is), but I was under the impression that the entire waveform must be dequed as a single item? Regarding the data sub vi process, it seemed to work wthen I was testing a simplified version of this without the wave of search function so I suspect that my problem could be with it. I would really appreciate any comments that you guys could provide. Thank you!

P.S. Please excuse the way I really hokey, the while conditional loop set up, I hope to have something a little more elaborate before you deploy the code.

daBub,

Use the threshold 1 d Array function rather than the search function.  That's what I get to generate a response without looking things up.  The threshold D table 1 is the first place where eon element is less than the threshold and the next element is above it.  That's why you have to reverse the table since you are looking for a falling edge.

Lynn

Tags: NI Software

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