The operator of a plant is only interested in the essentials – for example when operating an oven – you want to bake a cake. The operator does not care about unnecessary numbers and redundant information. And exactly in accordance with this need, we build our operating systems: The display only shows information that is really needed. Superfluous is simply omitted.
On the screen, the operator only finds the essentials, no more ballast: a qualitative representation, instead of a quantitative helps to operate the machine quickly and easily.
And that looks like this: