I have been looking at ASi for analogue kit but did not get a very convincing response from chaps here, so what else is there? I want to connect three wire PT100's to a local box which is connected to a network with other boxes back to a PLC or SCADA system via a bus system. The installation and configuration needs to be minimal. I would like to run only a power cable and the comms cable to these 'boxes' which would have to be IP65 or better and work -10degC to 45degC. Location to be on top of a low temp cold store and the probes can be 100mtrs apart at the extreme corners. The master PLC is 100 mtrs away from the store. I know there is Profibus and FF and the like, but associated PLC manufacturers have rack/slot orientated kit which is not robust enough (also not particularly cheap)unless its mounted in an heated enclosure. I'm trying to justify using a bus system instead of hardwiring to help improve installation speed, and reduce wiring errors.