The discrete event (DE) domain in Ptolemy provides a general environment for time-oriented simulations of systems such as queueing networks, communication networks, and high-level models of computer architectures. In this domain, each Particle represents an event that corresponds to a change of the system state. The DE schedulers process events in chronological order. Since the time interval between events is generally not fixed, each particle has an associated time stamp. Time stamps are generated by the block producing the particle based on the time stamps of the input particles and the latency of the block.
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