Reactions & Delays
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Time-triggered control systems are an important control paradigm. Eventtriggered controllers focus on correct responses to appropriate events, which are assumed to be detected perfectly, which simplifies their design and analysis but makes them hard to implement. Time-triggered controllers, instead, focus on reacting to changes within certain reaction delays. Implementations become more straightforward using controllers that repeatedly execute within a certain maximum time period, or execute periodically with at least a certain frequency. While time-triggered control models can be easier to develop than event-triggered control models, the additional effects of reaction delays complicate the control logic and safety arguments.