This information is part of the Modelica Standard Library maintained by the Modelica Association.

Basic definitions of a discrete block of library Blocks.Discrete. The output(s) will only change at events, but are not formally a discrete variable(s) in Modelica. The input(s) will be sampled, and can thus be continuous variable(s).

Important: If you connect several discrete blocks you should normally ensure that samplePeriod (and startTime) are exactly identical for all blocks, since otherwise the output from one block will be transformed into a continuous signal and sampled, which can cause a variable delay of up to one sample period leading to unexpected results.

Modelica 3.3 introduced synchronous operators that avoid the need to manually propagate samplePeriod to each block.

samplePeriod	Value: Type: Time (s) Description: Sample period of component
startTime	Value: 0 Type: Time (s) Description: First sample time instant

sampleTrigger	Type: Boolean Description: True, if sample time instant
firstTrigger	Type: Boolean Description: Rising edge signals first sample instant