Peter C. Wallace <p...@...> writes: > HostMot 5I20 encoder counter. With digital filtering turned on, the maximum > rate is limited to around 4 MHz. Thread rate should be unimportant as well, > especially with the original HostMot since its encoder counters are 32 bits > wide. Have you checked that the A and B signals are still in quadrature at > high speed? (needs a dual trace scope). Is the quadrature filtering enabled? > (it should be). Also it might be good to look at the quadrature signals at > the FPGA card.
Thanks for weighing in Peter. Whenever you speak, I have to put on my thinking cap for a while... What you are pointing out seems to imply that you are concerned about noise in the lines. It looks like I am going to physically connect some test pigtails to the 5i20 in the controller so I can scope what is happening in the signal lines there. I have had glitches on the limit switch inputs that stop the machine in the middle of a cut. Putting a debounce filter on the limit inputs has helped here... but it does suggest that there is a larger noise issue underlying some, if not all, of my problems. If you don't mind, I would like to ask a few things to help clarify things in my mind. How do I check to make sure that quadrature filtering is turned on? Is this a "config modparam" statement that goes in the ini file? Can you give an example? More info re: my system. The 3 machine joint encoders are single ended TTL and so I have the default jumpers in place on the 7i33. But, the 4th (spindle) encoder is a differential/RS422 model, so I have the jumper in the "UP" position for this one. I am aware of the "pre-revision D" alert that suggests removing the resistor sips in the 5i20. How do I ascertain which rev. 5i20 I have without pulling the card out of the computer? Thanks! Tom ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
