2013/9/2 Anders Wallin <anders.e.e.wal...@gmail.com> > > > Hi Anders. > > > > > > This is one link to the LinuxCNC wiki : EtherCAT LinuxCNC > > > Wiki<http://wiki.linuxcnc.org/cgi-bin/wiki.pl?EtherCatDriver> > > > . > > > > > > Alex > > > > Thanks for your comments and the link. > > Modbus TCP is attractive because it seems to use standard Ethernet NICs as > well as work with standard Ethernet switches. > > EtherCAT on the other hand seems to require special proprietary ASICs or > NIC-chips? I am also guessing that to maintain low latency an EtherCAT > switch is much more intelligent&expensive than a standard Ethernet switch. > > Anders > > What exactly do you want to do? Run a GUI from a remote machine or make an IP-based pendant, or?.. I've been working a lot with TCP based systems and you can never be sure that deliverance is under a certain time, it can be less then 2 ms most of the time but all of a sudden you get a re-transmit/broken package/broadcast and the TCP layer is delaying your message with 40 ms. You can be fast over time, but with no guarantee for each packet.
Once upon a time I had a customer who made chairs for the control tower in saw mills, the chair included all buttons, displays and joysticks need to run the entire process line. It was all Ethernet based and no interrupting/broadcasting computers were allowed on the network, it was purely dedicated for the controller communication. The emergency button could actually have a delay of many ms, but that was still OK. If you can manage the risc of having a delay and can handle it, you're good to go. Don't ask, just do it. :) ------------------------------------------------------------------------------ Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58040911&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
