> So does SAS and now SATA. The distances are not the same by default but > could be extended when needed. You and Marc Bodmer both talk about > expensive Ethernet industrial controllers. Who's going to buy "3/6 Axis > DC Servo controller (~900Eur)" for hobby or small shop use? > > It would be way less expensive to buy DIO, ADC, or DAC PCI card with > small PC box next to the CNC machine when PP is not available anymore. > > I thought that EMC is mainly for small installations with an occasional > large one. When you start talking about PLCs, SERCOS PCI-Board, etc. > that's another ball game. Nothing against it, just that a lot of people > will be left out. >
I did not mean everybody should just go and buy those not so inexpensive 900Euro Axis controllers. Just wanted to show that there acutally exist some devices. And compared to the really expensive industrial devices this is actually not so much. I agree it's too much for hobby use, I would only buy it if there is no alternative. But neverthless it's an interesting device. More interesting than this 900Euro thing are the bus connection chips and controllers i have in my list. And they are actually not so expensive. This would allow to do some interesting and inexpensive stuff. I am not starting to talk about PLC. EMC does a good job in taking over this part. Even in industry plcs are disappearing more and more. Their job is taken over by SoftPLCs on the CNC PC - same as with EMC long ago. Most DIO/DAC/ADC PCI boards I know are way more expensive or at least not cheaper than those 900Euro, and then you still have no power stage and motor control yet. Both of these Buses can be driven by Software Masters. This means you can use any standard Ethernet controllers on the host as with RTNET. And there even exist Opensource Masters for EtherCAT. So you don't need PCI Boards. Since Ethernet controllers are in EVERY mainboard nowadays this is the same situation as with SATA. Many even have 2 controllers onboard. There is no additional HW on the host pc side. The SATA idea is an interesting one. I think it's just not very practical. And it is really impossible to buy anything anywhere. ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
