jeffteel

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About jeffteel

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  • Birthday March 08

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  1. Hey Ken,

    You posted about 10 years ago about a solution for interfacing with a Sartorius scale in four rungs, but the sample code is gone. Any chance you still have it? This would be unbelievably helpful.

    Thanks!

     

  2. S-Curve Position Control or PID

    jeffteel replied to stud_wallz's topic in Allen Bradley / Rockwell Automation

    The easiest way I know of to do an S-Curve is to implement a simple function like this: f(t) = (3-2(t/a))*(t/a)^2 * 100 t = time a = accel (total ramp time in seconds) So for example, if the total ramp time you're looking for is 30 seconds, you would implement this function by using 30 for a, and you could just use a timer that counts up to 30 for t. Plug it into Excel and graph it. You'll see that it's a nice S-Curve that goes from 0 to 100 with an input of 0 to 30. Actually, just take a look at the attached spreadsheet, and it shows this more clearly. S-Curve.xls