This block creates a Boolean, continuous time, trigger signal whenever the clock of the input signal is active.
A particular use-case in which that block might be useful is the combination of "old-style" sampled blocks (i.e., "unclocked" discrete control functions implemented using equations between "when trigger then" clauses) with clocked blocks.
The following
example samples a sine signal with a periodic clock of 20 ms
period. After that a continuous time Boolean trigger signal is
generated at every clock tick of that sampled signal. The generated
signal is used as trigger signal for an "old-style" TriggeredSampler
block from the Modelica.Blocks.Discrete package:
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Note, that it is clearly visible in the plot that the "old-style" discrete variables have an implicit zero-order hold semantics, while the new clocked variables are only active whenever their associated clock ticks. Just compare variable sample.y (clocked) with triggeredSampler.y (unclocked) to observe the difference.