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skogsgurra: Today I was looking around and I found that GE's Fanuc GENIUS I/O is rated at 7500 feet, and about 6000 feet with a direct burried Belden twisted cable. Not sure but I think it uses some form of RS485. Looks intriguing, but not sure of cost yet. Will take a look at what Echelon...

ScottyUK: Thanks so much for your input. Was hoping that fiber would not be necessary. I was hoping that possibly Profibus DP would be OK (at 9kb it lists that each segment can be 1200 meters, but maybe this only works in the lab and not the real world). Itsmoked: Also, appreciate your...

The largest load will be the operating of small linear actuator motors (<1.5A load) and only one will operate at a time. The rest of the IO will be indicating lights, and sensing of the position of the equipment with either limit switches or prox sensors.

Thanks for your input. But, let me clarify a few items: I wanted the term Fieldbus to be generic for the various fieldbus now available (Profibus DP, Ethernet, Remote I/O, etc.). In looking over some of the available Fieldbus remote IOs available, to obtain the distance I need, fiber may be...

I am looking for a cost effective solution for a small amount of remote IO (aprox 12 IO) at each of about 16 locations. The furthest remote IO location will be about 3500 feet from the master control point. The locations are out doors, and interconnecting wiring needs to be direct buried...