Figures 2 and 3 show the control circuit of a medium-size commercial ice machine. Notice that the microprocessor has replaced a lot of the hard wiring that used to be inside a machine of this nature.
This type of technology is often referred to as “clean technology.” In fact, 10 years ago, there would have been so many wires going in and out of controls that the entire control circuitry would have looked like a plate of spaghetti.