On Fri, 25 Jul 2014, Marius Liebenberg wrote: > Date: Fri, 25 Jul 2014 21:07:31 +0200 > From: Marius Liebenberg <[email protected]> > Reply-To: "Enhanced Machine Controller (EMC)" > <[email protected]> > To: [email protected] > Subject: Re: [Emc-users] Stepper driven A axis with servos > > > On 2014-07-25 20:47, andy pugh wrote: >> On 25 July 2014 19:38, Marius Liebenberg <[email protected]> wrote: >>> I just noticed that when using mesa drivers the ECMOT is loaded without >>> the base thread specified but with the parport setup, the base thread is >>> specified. Does that mean that no base thread is loaded if it is not >>> specified? >> Yes, exactly that. >> >> But with the right firmware you will be able to connect the stepper >> drive to the 7i37, and not bother with the BoB. >> (looking at the firmwares there are none for 7i48 + stepper, but that >> doesn't mean that there can't be) > As I recall the IO on those cards (7i37) are not directly mapped but > have a serial interface. If I understood Peter right he mentioned once > that the IO will not handle stepper clock speeds. I think I did try and > failed at that.
The 7I37 outputs are probably a bit slow for controlling a step drive above a few KHz (and also require a external power supply since they are just switches) You should be able to drive the step/dir signals directly from the FPGA output (they can source /sink 24 mA) But you have to make sure you dont accidentally connect them to voltages >5 or < -0.5 > > -- > > Regards /Groete > > Marius D. Liebenberg > +27 82 698 3251 > +27 12 743 6064 > QQ 1767394877 > > > ------------------------------------------------------------------------------ > Want fast and easy access to all the code in your enterprise? Index and > search up to 200,000 lines of code with a free copy of Black Duck > Code Sight - the same software that powers the world's largest code > search on Ohloh, the Black Duck Open Hub! Try it now. > http://p.sf.net/sfu/bds > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Want fast and easy access to all the code in your enterprise? Index and search up to 200,000 lines of code with a free copy of Black Duck Code Sight - the same software that powers the world's largest code search on Ohloh, the Black Duck Open Hub! Try it now. http://p.sf.net/sfu/bds _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
