State Machines Sample Clauses

State Machines. 46 6.2.4 Flow of Events . . . . . . . . . . . . . . . . . . . . . . 47 7 Evidence Consolidation 49 7.1 Reuse issues 49 7.2 Impact on the System Development Process 50 7.3 Known Strengths and Weaknesses of Tools 51 7.4 General Modelling Language and System Concepts 52 8 Conclusions 53 Bibliography 56 Chapter 1 Introduction‌ The DEPLOY workpackage WP1 deals with the deployment of formal engi- neering methods (principally Event-B) in the Automotive Sector. The work package is lead by Xxxxxx Xxxxx XxxX in close cooperation with the follow- ing partners: • ˚Abo Akademi • University of Newcastle • University of Southampton • University of Du¨sseldorf • ETH Zu¨rich • CETIC Our main objectives in WP1 are threefold: (i) the deployment and de- tailed assessment of formal engineering methods in the context of automotive system development, (ii) the development of a methodology that is specific and applicable for automotive systems, (iii) the development of concepts for adaptation of our development process in order to efficiently use the method- ology. Our objectives in detail are: • Provide evidence that refinement-based formal engineering methods are applicable to Bosch systems. The key priorities for Bosch are: – Structured development of system requirements and systematic construction and validation of formal models from requirements – Effective reuse and evolution of formal models and analysis
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State Machines. The desired dynamic behaviour of a component can be described by a state machine if a direct assignment specification of the outputs of the component is too complicated. For the specification of the SSE we used state machines in a similar way but in a simpler form than defined by the RSML specifica- tion language [LHHR94]. For our purposes a state machine consists of states connected by transitions. States have a unique name and a descriptive com- ment that describes the state. Transitions define how to get from one state to another. A transition is guarded by one or more conditions and may or may not have an associated transition action. A state machine of a component is modelled as an internal or output variable with an enumerated set as a type. Each state of the state machine is represented as a member of this enumerated set. Example: In the following we show the state machine for the engine coordinator an external component of the SSE which coordinates the engine. The state machine of the engine coordinator has the following states: • ENG OFF • ENG CRANKING • ENG RUNNING • ENG STOPPING We modelled the states as an enumerated set with the values ENG OFF, ENG CRANKING, ENG RUNNING, and ENG STOPPING. A state vari- able Engine State with the enumerated set as a type has been used to model the state machine itself.
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State Machines. ‌ Overview For enhanced deployment, i.e., the modelling of the SSE, we plan to use the new Event-B statemachine plugin (see [wik]). This plugin allows the modeller to graphically draw a state machine using boxes representing states and arrows representing transitions between these states. The plugin also supports hierarchical state machines and Event-B refinement. The graphical state machine can be translated into Event-B. Each state is hereby modelled as a separate boolean variable named by the state which is set to TRUE when the state is entered and set to FALSE when the state is exited.
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State Machines. The contractor shall use a state machine that uses either a type-defined enumerated type control, queue, or event structure to manage states where appropriate.
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