On 11/01/2012 12:25 PM, Stuart Stevenson wrote: > Gentlemen, > What is ferror used for in motion or any calculation? I thought it was > only for human feedback during the tuning phase. It is used to stop motion when the error is excessive. On my machines, it causes an E-stop. > > PID error and ferror are not two different things? Well, I think that's the crux of Peter's complaint, is that they should not be different, but his claim is that the ARE different. If you want to demand tight tolerance for following of the commanded path, then you really need the PID to be striving to minimize the same thing that is used to stop the system when it doesn't.
I have not explored this very deeply, but I think Peter may be on to something, and I believe I have seen the same problem but I didn't find where it was coming from. Jon ------------------------------------------------------------------------------ LogMeIn Central: Instant, anywhere, Remote PC access and management. Stay in control, update software, and manage PCs from one command center Diagnose problems and improve visibility into emerging IT issues Automate, monitor and manage. Do more in less time with Central http://p.sf.net/sfu/logmein12331_d2d _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
