I posted earlier to EMC developers but it seems to have disappeared. I have been thinking about a new protocol. Ethercat are a perfect real time network there data is inserted while packet is pass thru, actually it is very similar to cascaded shift registers although CRC is also added. I have not studied protocol yet but this kind of network it should be possible to put node sourcing/sending data at any node or vary number of nodes with exactly the same message circulating the network. It would however be possible to achieve something similar for data sent from linuxcnc if multicast is used although only for outputs.
I would propose to put axis position control at motor controller, advantages: 1. Motion control would be reduced towards youtube style real time demand since positions could be sent beforehand and buffered. 2. Position control could be sent to all nodes with one multicast message. 3. If interpolation is used it would be possible to reduce number of messages. 4. Divide outputs between several nodes would only affect real time performance for hopefully slow feedback. Problem would still be the same with inputs although I think most of them have less demand on response time. Nicklas Karlsson ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785111&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
