Events for modeling of Human-System Interaction with IOPT Petri net

In this paper, a set of event types for humansysteminteraction modeling is presented, and its usage withIOPT nets (Input-Output Place-Transition Petri nets)models is illustrated. Currently, a non-autonomous eventbased on the computation of the change with respect to aspecific threshold of input signals values on two consecutiveexecution steps is defined for IOPT models. Other types ofevents are proposed, allowing the definition of an event notonly based on a threshold in the signal value, but also as achange on the variation of the signal. The concept of delayedevents considers two values in different time steps (otherthan consecutive steps). This concept can be applied toprevious types of events. The concept of composed events isalso introduced, in order to create events dependent on twoor more events on the same signal, at the same time step aswell as at different time steps. Finally, an example is used toillustrate the concepts presented.