Leslie, If you are using this under florescent lights you will pick-up a lot of noise on a four foot cable. If the cable is shielded it shouldn't pick up much noise though. Is the cable shielded? LennyWayne
Leslie Newell wrote: > Hi Peter, > > If it is edge sensitive then as you say, inverting the signal has little > effect. I was going by your previous statement where you said it was > dependent on the state. After doing more tests, noise looks to be a > possible culprit. It seems odd that I have a relatively bad noise > problem on the index while A and B are fine. They all run down the same > screened cable. I ran some tests and the other axis also very > occasionally misses. Neither axis loses position while running so A and > B don't seem to be affected. > > From your docs, A and B are filtered. Does Z have the same filtering? > The 7i29 has a relatively long ribbon (about 4') so it may be that it is > picking up noise. I will first add some common mode chokes to the 7i29 > motor outputs (works well for Geckos and Rutex drives). If that has no > effect I'll try moving the encoders to the 7i33. That would entail a lot > of rerouting and remaking cables so it would be a last resort. > > By the way, when the encoder inputs are set up for complementary > signals, what happens if one wire becomes disconnected? Is there a fault > signal? > > Les > > > >> The hardware works (just tested SV12 encoder 5). There may not be much >> apparent difference between inverted or non-inverted index because they are >> both edge triggered. It looks like the driver does not set the ABGateIndex >> bit >> so what I said about index happening all the time with the wrong index >> polarity would not happen, just the home position might change by a count or >> 2 >> depending in index width (assuming a normal rotary encoder short index). >> >> If swapping the leads solves your problem, it might be electrical >> troubles. The current driver not setting ABGateindex means a narrow index >> pulse would work regardless of polarity though the home position would >> change slightly depending on whether the rising or falling edge generates >> the index event (since an edge is always needed) >> >> >> > > ------------------------------------------------------------------------------ > Enter the BlackBerry Developer Challenge > This is your chance to win up to $100,000 in prizes! For a limited time, > vendors submitting new applications to BlackBerry App World(TM) will have > the opportunity to enter the BlackBerry Developer Challenge. See full prize > details at: http://p.sf.net/sfu/Challenge > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
