PROGRAM SLOWS DOWN WHEN IT ENTERS A BUSINESS STRUCTURE

OK, so here is the problem I have do this output pid controller is between 0-100 in this program, I'm just trying to make it work so I made a function to compare that when the controller output is 0 and the constant 0 I'm starting a business loop which transform the output for a second and turn off for a second.   When I go into the structure of the case, the rest of my program slows down

I don't know why, I tried to do a while loop and a structure outside my main loop but I can't get my signal of my statement to compare to enter the second loop where I get my output to bike in 1 second intervals

This is the VI please help

I'm still learning how to use labview in passing

Thank you

Gary

Gary,

The next thing you want to learn more about LabVIEW dataflow. This is the fundamental paradigm of LV and explain your slowdown problems.

The basic concept of data flow is any node (node = function, Subvi, structure) can begin to run when the data is present on all its entries and no data will be present at its outputs to execution comopletes of knot.

How will this affect your VI? The real deal has a wait 1000 ms (actually two, one in each case of the internal structure of the housing = redundant code). The structure of the case will not complete execution until the wait ends. And the while loop does not complete its repetition until the end of the structure of the case. The result: at the exit of the PID.vi = 0, the loop runs at 1 second per iteration.

What is the solution? Continue execution of the loop at intervals of 100 ms. sure in the structure of matter (true case) and another register to shift of how number of intervals of 100 ms is passed. When the count reaches ten, toggle the output line.  Do not use the 1000 ms of waiting.

All the code in your internal structure is not necessary. Connect the output remains directly to the digital Arduino write VI.

Be careful with the comparison to zero with floating point data. If the calculation which produces data has round off errors you could get a value such as 0.573E - 15, but which is not equal to zero. It is better to compare to a small range of values above and below zero.

Right to left wiring is much easier to follow in trying to understand what makes a program. Using the tool to clean occasionally will help (although he eventually frustrate you also).

Lynn

Tags: NI Software

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