On 9/22/2015 10:47 AM, John Dammeyer wrote: > I Agree! For the same reason seeing windows MACH3 hang and the USB smooth > stepper continue to send out stepping pulses on the Z throwing the machine > alignment out as it pushes against the table. (router bit not turning and > didn't break). > > An ESTOP and limits have to be part of the hardware interface side of the > equation. And there has to be enough intelligence to let the trajectory > planner know what has happened. Even with as simple a feature as a remote > feed hold button. > > One can't just send large blocks of motion information to the target > hardware and then tap feed hold and wait for 30 seconds worth of queued > motion to play out. By the same token the graphic display and trajectory > planner needs to know when the hardware did actually stop so it can rewind > back to that point and start again. So it's a tightly coupled closed loop > control. All currently done on one computer with access to both sets of > data structures for motion commands and motion implementation. > > But the future _is_ separate drive and interface. When I have some time > I'll look further into this.
The machine hardware needs to be smart enough to monitor for communication failures. There should be full duplex communication so that every command either way is answered by an ACK. No response, it shuts down. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ------------------------------------------------------------------------------ Monitor Your Dynamic Infrastructure at Any Scale With Datadog! Get real-time metrics from all of your servers, apps and tools in one place. SourceForge users - Click here to start your Free Trial of Datadog now! http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
