Ray Henry wrote: > Hi Eric > > I've tried all sorts of things with this problem of unknown pin > condition during PC start and stop and came to the personal conclusion > that there is nothing short of a charge pump that I can be absolutely > certain of. > I went to great lengths in my boards to prevent this kind of problem. The outputs can only be enabled when the E-stop circuit is in the OK mode. There is a watchdog timer that command an E-stop if the computer is not updating the board continuously. And, there is a power-on reset that puts it in E-stop.
When EMC starts up, it begins writing new velocity commands (of zero when it is not yet in "machine-on" state) to the board. That satisfies the watchdog timer, so then EMC can call for it to come out of E-stop. Jon ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
