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Implementing State-Machine Logic  File Size 10.45K | Date Added August, 21, 2000 You can you use and modify any of these worksheets with the Vissim 7 trial

A State Machine, as its name implies, has different 'states'. Depending on the state that the system is in, certain functions are carried out and other functions are denied. You can visualise being in a particular state as being in a certain room in a house. In the dining room you can eat (if you have food) but you can't wash the dishes. To wash the dishes you must be in the kitchen. The rules for eating in the dining room (=the Eating State, say) include being in the kitchen to cook the food then bringing it to the dining room. The example shows a system with just 4 states and 2 types of event. The events are the conditions which cause the changes of state. State machines are a very useful way of describing the way in which systems work. For example, a digital watch can be described in such a way. The design of control systems can often benefit from the State Machine approach. Virtually any type of condition can be incorporated into the model which, with VisSim can include the dynamics of the system itself

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