The dashboard has different states. The measurement values and the states of the respective devices can be either valid or unknown. The device itself can also be in various states, such as Calibration Mode. It may also indicate that the measuring device has an error.
There are 3 different states of the dashboard itself: green, yellow and red.

The states are shown in the circles and not in the fields of the parameters. Green indicates that everything is running smoothly, while yellow means maintenance and a foreseeable issue. Red signifies that the system has encountered an error, or the parameter is not given.