Description of project : 30 button every one is sepearate by 10 metre the LCD display name of presed button. this is my schema what you think ? i wait for your comment with lused
The question is so vague that only guesses are possible.
My guess is that he's presented (a few of) his requirements, and wants people to provide solutions for him.
As he hasn't given any constraints on cost, performance or other such essential details, it's impossible to judge whether the FDDI ring with HTTP client nodes is appropriate or not...
Let's see if Marlap Lamb the Ace Professional Guesser can crack this one...
10m is not long distances. It's just a question of bandwidth. How short pulses must be possible to detect.
But it is important that the wires are twisted, and there should be the usual EMI filtering and overvoltage protection.
Unless all 30 are in 1 long line - giving a total of 300m...
And that is one of the problems with the OP post. Too little information, so no use speculating.