On 02/28/2011 07:37 AM, Mark Wendt wrote: > On 02/28/2011 08:19 AM, Dave wrote: >> Siemens DriveCliq works the same way. Everything is point to point. >> No external hubs or switches. >> I think the controller I was using recently had 6 or 8 Ethernet jacks. >> The drive module had 3, one for the connection to the controller and two >> for encoder connections. >> I think the line module (Ac to DC smart power supply) had 3 Ethernet >> jacks. Hooking everything up was very quick. >> >> Dave > > Looking again at the Sercos3 implementation, each "host" requires at > least a two-port network interace. That's how they implement either the > "Line", "Ring" or other network topology. Each "host" has to process > the data and then pass it on to the next host in a host 2+n topology. > > The "Ring" topology looks to be the most efficient, since two channels > are being used to move the data around the circuit, and the second > channel offers a bit of redundancy of the primary channel goes down. > > For environments that have multiple machines, this could be an issue > with multiple, long network cables going from the master controller to > the slave boxes. With that in mind though, it's kind of hard to imagine > multiple instances of EMC2 running on one controller PC controlling > different machines. For a single control PC sending data to a single > control box, this shouldn't really be an issue. > > Interesting also how the protocol utilizes multiple length packets (or > as they call them, Telegrams), anywhere from 84 bytes to 1538 bytes in > length. > > Mark
Sounds like standard ethernet frames. I would imagine they would use standard frames because ethernet hardware is expecting that. http://en.wikipedia.org/wiki/Ethernet_frame Moses ------------------------------------------------------------------------------ Free Software Download: Index, Search & Analyze Logs and other IT data in Real-Time with Splunk. Collect, index and harness all the fast moving IT data generated by your applications, servers and devices whether physical, virtual or in the cloud. Deliver compliance at lower cost and gain new business insights. http://p.sf.net/sfu/splunk-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
