"Larry W4CSC" wrote in message
...
"Doug Dotson" dougdotson@NOSPAMcablespeedNOSPAMcom wrote in news:Bqidnb-
:
Ethernet has not done well on the factory floor or the automotive
industry because its behaviour is not deterministic for real-time
use. Some efforts have gone into making it better for hard realtime
apps, but other protocols are better suited.
Doug
s/v Callista
It hasn't "done well" in cars for the same reason it hasn't been done in
boats.....proprietary obsolescence!
Nonsense. In cars, CAN is used. For CAN, highly integrated chips are
available for, for instance, a mirror controller: a single chip with CAN
interface and high power outputs to drive the motor. All protocol stuff is
inside this chip. Such simple solutions do not exist with ethernet.
I've never been on the factory floor and never intend to go, either.
And on factory floors, there's a lot of FieldBus, Modbus etc, all serial
RS-485. At the toplevels where timing is not critical, ethernet is used for
collecting data to be displayed and for transport of other non-time critical
data.
Do factories put up with this proprietary bull****, too?
No. Modbus and Fieldbus are well documented protocols, open to anyone who
wants to use it.
Meindert