Ok hopefully I can make this a little clearer
The unit is a 6" touch screen with 12 discrete (on off) inputs and outputs.
cutrrently this is all I have for I/O
What this means to y'all is that you can create logic for things such as
auto top off or your lights to turn on and off or for pumps to stop/start
and then have a grapical representation of this on the screen
eg you can run 2 floats in to the unit and create logic so that an output turns on when the bottom float trips and off when the top float trips and then if you use a 24vdc realay you could turn on and off a top up pump
You can also turn things on and off from the screen.
There is a company called sensorpulse that makes modules that allow you to convert 2 discrete inputs in to an analog input but I haven't had chance to play with this.
This isn't a plug and play aquarium thing but once ya get it running the geek factor will be waaaay up there
the programming logic is ladder logic and I could give anyone a hand with getting started programming.