They essentially define the needed interfaces to processes or objects. Use case diagrams (UCDs) define system behavior through the interactions of actors and processes. If the run time in the RUNNING state is exceeded, then the device also goes to the IDLE state. If a STOP event is received, then it goes to the IDLE state independent of the current state. On a RESUME event the device goes back to RUNNING. When pausing is complete the device enters the PAUSED state. The device may be paused and when performing pausing logic, or waiting for the physical device to respond, it is in the PAUSING state. It starts in the IDLE state and when it receives a START event it will go to the RUNNING state. The following diagram illustrates a simple nested state model for a device. In control systems, there can also be logic that is repetitively executed while in a state. Each event in a state model defines the actions that are to occur when the event happens. Guard conditions define Boolean checks that prevent an event from causing a state change, and are also used to simplify state model designs. Variable values support looping of state/event values, allowing different actions depending on the loop value. Nested states are commonly used in specifications to reduce state model complexity and make them easier to understand. Nested states support complex state models, where one event may cause a transition from multiple states.
UML state models are extended to include nested states, variable values associated with states, and guard conditions. State models define the internal behavior of objects that can be implemented in procedures, function blocks, or any other type of code. UML state models are an extended version of finite state models, which are diagrams containing states and events. State Models in UML are used to define internal logic. System behavior is defined through Use Case Diagrams and Sequence Diagrams. Last month’s column described two parts of UML that deal with structural information class models and object models. The structural models can be used to generate databases, function block libraries, messages, IEC 61131-3 structured text STRUCT definitions, C# classes or C++ classes. UML defines a standard language for each of these elements.
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