> Now the problem is I can't afford an $8000 Ethercat based servo controller. > But I wonder it the same principle can't be applied to any serial multi > drop bus? As long as there is a "master" that users a hardware clock to > shift bits out of a hardware buffer then it should work
Well one would be possible but twenty is not. > I'd prefer Ethercat because every PC, Rasbury Pi and Mac has a built-in > Ethernet port so there is no hardware to buy and install but the slaves are > expensive. Cost of Ethercat chip for hardware should be roughly around $5 + Magnetics + Connector. > Now that we have an "existence proof" I', thinking that > EMC/linuxCNC/MachineKit have partitioned the problem wrong and the result > is that it forces a requirement for hard real time to far up the chain. The problem is well partitioned, there are NML communication between real time and user interface. Problem is it have been forgotten so it force requirement for hard real time to far up the chain. > OK, "wrong" is to strong of a word to fault the original designers. No, they where right and put NML command in between real time and GUI but then it have been forgotten. > They > where working in a world where cheap micro controllers did not exist. Maybe. It might also be they lived in a world without good real time perfomance on computer with GUI. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
