On Wed, 19 Aug 2009 16:57:43 -0400, you wrote: >>PC is dual boot with Windows XP, ran Mach3 at 35kHz Kernel speed and >>it's capable of seeing the index pulse and giving an accurate rpm >>reading to 1000 rpm! I find it odd that Mach can use it but EMC can't >>above 200 rpm? Any ideas? >> >> >It's probably related to the fact that you are running EMC2 at the >equivalent of a 16 kHz kernel. (unless you changed your base period >from 62500)
If it's approx half the Mach kernel value, I'd expect it to be able to see nearer 500 rpm, not just 200? Worst latency I've managed to get doing several things at once and running a GL screensaver in a window is 12uS. Pulse diagram for drives shows a 1uS rise and fall time and a minimum duration of 2.5uS, direction must lead the rise by 2.5uS or greater. I'll try dropping the base period some after I've fitted the other encoder and repeat the test. The 62500 figure came from stepconf. Steve Blackmore -- ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
