Says it can support up to 16 via the use of extra Hubs.
But still two cable runs minimum would be great.
Just kinda brainstorming. but i was thinking of using the normal 8pin (or whatever the e-stop remote connector is) on the end of a cat5 cable. and pair that cable with the cable for the USB extender with some type of wireloom / tape.
At the end have the USB extender and some type of breakout box for estops. that way i can estop each box from one button and still only run "one" wire (actualy two attached to eachother)
"This is not "work". It's a disease, addiction and passion. Only slightly cheaper than cocaine, but similar effects."
-dnar