SoftMotion "Buffer Update" VI refuses to take more points?

Hi all

I'm on LabVIEW 2012, trying to figure out the example "Servo Drive (9505). Here's what I did:

  1. Copied the 'continuous Contour Move.vi axis' in a new
  2. Set up a SoftMotion (simulated axis), using default properties/settings
  3. Set up a Table SoftMotion (slimming, 1 axis, empty buffer)
  4. Adjust the example VI to use my Table axis, and he ran

Judging from the code, I expect the program of a sinusoid of output continuously until I hit the stop button. However, he stopped after 2 cycles.

Level curves given in the example are an array of 20 points, so I thought that a buffer of 100 points table was a lot.

I placed a waveform graph to control the output of 'space available' VI "check for space". This was the result:

  1. For the first iteration, the available space was 80
  2. For the second iteration, it jumped to 60
  3. After that, it gradually climbed linearly to ~ 99, then dropped to 0
  4. He climbed up to ~ 1 the next iteration, and the stopped program

What is going on? Should space not 20 or less all the time (since the code attempts to write 20 points in each iteration buffer)?

Mystery solved in a different thread: http://forums.ni.com/t5/Motion-Control-and-Motor-Drives/SoftMotion-Express-VIs-vs-Function-Blocks/td...

I thought that 'Points of update' will run if "Run" is true, but this isn't how it works. Instead, it is triggered by a rising edge to 'run '. In my example, "Run" is always true, so there is no rising edge.

Tags: NI Software

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