What are the disadvantages of a centralized single system?
In a single computer system, if there is a problem with the computer, it affects the whole greenhouse range. Also, wiring of sensors can become complex. Either all the wiring must be brought to the central computer, or brought to concentrators that send and receive signals from the central control. A single central location can be distant from some zones, and therefore less convenient. Furthermore, for a large range, a powerful enough computer may actually be more expensive than multiple smaller computers.
