@ Gene your link but there are a lot of other ... I means that powerlink -> B&R become part of ABB .... so abb become manufactorer of plc and powerlink device (abb have poverlink on yours drive actully). https://technology.ihs.com/591442/will-br-acquisition-give-abb-a-boost-in-industrial-automation
for 10Gb ethernet please see cc-link ie ...... bkt 2017-09-12 2:09 GMT+02:00 Gene Heskett <ghesk...@shentel.net>: > On Monday 11 September 2017 19:23:37 Chris Albertson wrote: > > > Why not SPI speeds over a long cable? Gigabit Ether net is a good > > example. It is built into almost all computers and can be 1GHz over > > 100 meters of cheap unshielded wire. > > > > They use only a few basic tricks, none of which add much to the cost > > > > 10/8 encoding to guarantee a minimum number of bit transitions even if > > the data is a long string of zeroes. > > Clock mixed with data so the receiver clock can be cheap non-precision > > Differential to resister common mode noise > > galvanic isolation to prevent ground loops > > > > There is also 10GHz Ethernet but it is not built into common consumer > > equipment but even 10G data rates are easy to pushover 100 feet using > > just RJ45 jacks > > > > The trick is to NOT think about how hard it is to push 10Gbps over a > > wire. But to think how easy it is to build a microwave data link when > > you can use wire in place of a clear air path. No need for antennas > > and you can use way ultra-low power. > > > > even for the case of SPI, think in terms is radio transmission lines > > and the job becomes easier. > > > > On Mon, Sep 11, 2017 at 9:54 AM, Nicklas Karlsson < > > > > nicklas.karlsso...@gmail.com> wrote: > > > > On Monday 11 September 2017 07:16:00 theman whosoldtheworld wrote: > > > > > why not powerlink ie? > > > > > > > > Wikipedia description shows some promise. SPI speeds over a longer > > > > cable, maybe. > > > > > > No SPI over long cable. For long cable RS422 will work, there is a > > > tradeoff between cable length and speed. > > > > Or for mind boggling distances, how about a g-line? Virtually zero losses > over a mile or 3 using common steel wire, single strand? No real reason > it cannot be bidi by using 2 non-harmonically related carrier > frequencies. > > 2 secrets to both low loss and low cost since the wire's ohmic losses > aren't a major concern, its nothing but a waveguide with no external > walls. The other is that when it goes past a supporting pole, it must be > tight so the the included angle where its attached to the supporting > insulator is less than 5 degrees, as a certain amount of the waveform > energy will be radiated and lost as it continues in a straight line, > leaving the confines of the field established by the central wire. > > This central wire exits from the center of a flat conductive panel that > is 1 or more wavelengths in radius. And re-enters the rx end in a > similar structure. > > Or with small dishes and "gunn" diodes, which are innately bidirectional, > the wire can be dispensed with. We have a remote broadcast linkage > lashup running at 23 gigahertz, using 12" dishes on both ends, that has, > when our satellite truck is on location up to several miles, I think 22 > is the record, which has saved the station its cost in satellite time > not rented many times over. If we can clear line of site see the > studio's 255 foot STL towers top beacon we fire it up and cancel the > satellite time. Our unit isn't bidirectional, but thats a matter of > changing out its video circuitry on both ends. Power output is 60 > milliwatts. > > If the sheckles can be found, distance vs bandwidth is a solveable > problem. In this case the g-lines initial construction costs for > planting all the support poles, and the cost of the gunn diode > assemblies, both up front costs, are at best, still discouraging. > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > ------------------------------------------------------------ > ------------------ > 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 > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
