On Wed, Jul 13, 2016, at 03:57 PM, Leonardo Marsaglia wrote: > Hello Jon. > > Well, the encoders that are already installed on one of our machines are > labelled with the Index pulse. The thing is I can't read the pulse with > halscope for example. > > I just tried to use the home using only index pulse and apparently the > index pulse is working because the axis latches until it stops and it turns > always a single turn more or less eyeballing it. > > The strange thing is I that I can't trigger the scope with the index pulse > on LinuxCNC, and also I can't measure the index on my other encoders. I > guess I should try to wire them to a LinuxCNC pc and make home manually to > see if they work ok.
In your original posting you said you couldn't detect the index pulse with a digital scope at 20nS. Now you say you can't detect it with Halscope. Those are two completely different things. As Peter said, if you are using hardware encoder counters (Mesa, PPMC, or any other), Halscope is very unlikely to see the actual index pulse. But that doesn't matter. If you want to look at things with Halscope look at the index-enable HAL signal. It will be set true by the motion controller when the homing sequence starts to look for an index, and then set false by the hardware encoder driver when the index is detected. If index-enable goes true and then never goes false, that points toward the index signal from the encoder not making it to the hardware encoder counter. That is when you dig out the real scope and look at the real signal on a real wire. > > > > 2016-07-13 14:29 GMT-03:00 Jon Elson <[email protected]>: > > > On 07/13/2016 08:56 AM, Leonardo Marsaglia wrote: > > > Hello to all. > > > > > > We just tested some Heindenhain encoders and as happened with other > > > encoders we can't sense the index pulse. We tried to detect it with a 20 > > > nano seconds period on a digital scope but nothing happens. All the other > > > pulses are working perfect except the index one. > > > > > > I have to mention that this happened with other encoders too, but since > > we > > > didn't need to use them with index pulse on the other machines we just > > let > > > it that way and didn't worry about it. > > > > > > > > Well, if the scope does not trigger on it, and it triggers > > fine on the A and B, then it just isn't there! > > Now, of course, the index will only happen once per rev, so > > you have to make a full turn to see the pulse. > > Are you SURE these encoders actually have the index pulse? > > > > Jon > > > > > > ------------------------------------------------------------------------------ > > What NetFlow Analyzer can do for you? Monitors network bandwidth and > > traffic > > patterns at an interface-level. Reveals which users, apps, and protocols > > are > > consuming the most bandwidth. Provides multi-vendor support for NetFlow, > > J-Flow, sFlow and other flows. Make informed decisions using capacity > > planning > > reports.http://sdm.link/zohodev2dev > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > -- > *Leonardo Marsaglia*. > ------------------------------------------------------------------------------ > What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic > patterns at an interface-level. Reveals which users, apps, and protocols are > consuming the most bandwidth. Provides multi-vendor support for NetFlow, > J-Flow, sFlow and other flows. Make informed decisions using capacity planning > reports.http://sdm.link/zohodev2dev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users -- John Kasunich [email protected] ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports.http://sdm.link/zohodev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
