On 1 March 2017 at 19:55, Kirk Wallace <kwall...@wallacecompany.com> wrote:
> On 03/01/2017 04:42 AM, Roland Jollivet wrote: > > I had always assumed that machine MPG's generated one state change per > > click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, > and > > saw that it was also 4-states per click. Obviously, one 'pulse'/detent > > > > Does anyone know the rationale behind this? > > I don't know, but in my opinion ... > there are four pulses per quadrature cycle and the pulses have to follow > a proper sequence for forward and reverse rotation. This can produce a > more reliable input for each detent location because a proper set of > pulses are needed. If there is any electrical or mechanical noise > (detent close to a pulse, machine vibration) and we use only valid > cycles, rather than raw pulses, we will have a more robust input. It is > sort of like using parity checking on data words and maybe hysteresis > (more than one pulse to change a state either way). > > I did think of that, but figured if you were getting spurious inputs, you would need to repair your machine. I presume then, that if you feed a binary increment into LCNC, instead of a quadrature increment, it would show an error state? ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
