John Kasunich wrote: >Jon Elson wrote: > > >>John Kasunich wrote: >> >> >> >>>The Pico systems boards (USC and UPC) have opto-22 modules on most of >>>their I/O, which isn't good for encoder signals. >>> >>> >>> >>In fact, they do work. You should be able to go to at least 100,000 >>counts a second through the optocoupler - so it is definitely not the >>limiting factor. >> >> > >I thought opto-22 input modules came in 120V AC and 24V DC flavors? >Encoder outputs are neither. If there is a 5V input module then I stand >corrected. > > > I have Opto-22 compatible OUTPUT positions on all the controller products (the PPMC board set, and the USC and UPC boards.) But, I have been using Fairchild H11A217D optocouplers for the INPUTS. They are not pluggable, and have a built-in isolated ~5 V power supply, so all you need is a contact closure. They were intended for limit and home switches, drive fault and E-stop relays, etc. But, other than the restriction that the driver can only sense them once per servo cycle, the inputs should work for any digital signal, as long as it will pull the input to ext ground. That's one of the catches, that the digital input ground is floating, so you have to tie the ext. ground to the ground for the encoder. And, the floating supply really doesn't have any spare current to power an encoder.
Jon ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
