Discrete signals with a finite number of value ranges for the signal parameter where each value range is assigned as a whole to a specific item of information.
Digital signals can also have multiple parameters (DIN 19 226).
In control technology digital signals are only used with two value ranges (binary signals). A digital signal comprises several parallel binary signals (Figure D 27 a) that combined signify a specific character, or a series of chronological binary signals (serial, b).
In control technology digital signals are either discrete and continuous timeor discreteand discrete timebinary signals.
Figure D 27: Digital signal representation a) parallel, b) serial