I have a few questions that I could not find any answers for anywhere else(google) Hope you guys can help since I have an assignment Im already done with, but trying to add a little more to it.

*1*What advantage do Field-buses gain by using Ethernet
Ive read about it in a book but its a school book and therefore it doesn't really answer anything important... as usual

*2* I need to set up 3 computers(1 laptop, 2PC/tower) and connect a printer to them and keep it as wireless as possible. I've "bought" 1 Router and 2 USB Adapters(WLAN) to connect to the tower computers. Ive set up all computers with the router and the printer, but I'm trying to understand how the signaling is working out. I believe the computers and the printer send signals to the router and the router returns those signals back to them and if somebody prints something then the router sends a signal from the computer thats printing "something" to the printer and "something" is printer out.
I need to draw a schematic drawing of how it'll all work out, (Attachment), and Im trying to get those extra POINTS so need to know if my thinking of how the signaling is sent and received is wrong or right .



You wouldn't be doing my homework for me, its already done just trying to get some extra points and understanding/knowledge while I'm at it

Thanks in advance

[recovering disk space, attachment deleted by admin]http://en.wikipedia.org/wiki/Fieldbus
Quote

Fieldbus is the name of a family of industrial computer network protocols used for real-time distributed CONTROL, standardized as IEC 61158.

A complex automated industrial system — such as manufacturing assembly line — usually needs an organized hierarchy of controller systems to function. In this hierarchy there is usually a Human Machine Interface (HMI) at the top, where an operator can monitor or operate the system. This is typically linked to a MIDDLE layer of programmable logic CONTROLLERS (PLC) via a non-time-critical communications system (e.g. Ethernet). At the bottom of the control chain is the fieldbus that links the PLCs to the components that actually do the work, such as sensors, actuators, electric motors, console lights, switches, valves and contactors.