The most common areas of application for black boxes are:
- Device connection points in a black box:
One or more functions should not be realized with an existing symbol, but rather realized using a black box with device connection points, and logic information should also be able to be represented (e.g., for displaying internal circuitry).
This is the case in the so-called "Black box". This type of representation is often used for devices whose content / function is unknown or whose content / function should not be made known.
- Symbols without a DT in the black box (connection point view):
One or more functions should not be realized with a symbol, but rather with a black box containing one or more symbols. The connection points are not (or not only) represented using device connection points, but rather using symbols. Logic information must also be able to be taken into account here.
- Symbols without a DT in the black box (nesting):
Various devices should be combined into a group (unit). It should also be possible to build several such units inside each other, i.e., to nest them. Such units can either be purchased as finished units, or they are self-made. Some companies have planned many standard functions in finished modules, that can then, for example, be manufactured by trained personnel in series production.
Since nesting is not always desired, it can be switched off for particular function groups (e.g., all devices, only for terminals).
See also