On Fri, 2007-10-26 at 21:04 -0400, Stephen Wille Padnos wrote: > Jon Elson wrote: > > >Kirk Wallace wrote: > > > > > >>There is some discussion on another thread about using Ethernet for EMC > >>I/O. I can see that there is the appeal of plentiful and cheap hardware
... snip > >keep excess net traffic off the segment that has the real-time > >trafic going on.) > > > > > An ethernet segment must be either RT or not RT. If you connect a > non-RTnet device to a hub/switch with RT devices on it, all bets are > off. So, does RTnet use any of the standard Ethernet hardware? If not, do PCI card routers allow you low enough access to the firmware to reconfigure it for RTnet? > I think there were even restrictions on the number of hubs you can > have, and they may say no switches at all. You can't use any old > topology with RTNet. RTNet is a TDMA scheme - each device gets a time ...snip > Yeah - for some reason, everyone and their brother is asking about USB > motion controllers right now. I've just about gotten carpal tunnel > trying to explain why it doesn't work, and yet the questions keep coming. > > Oh well > > - Steve -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe Bridgeport mill conversion pending Zubal lathe conversion pending) ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
