By Filipe de Carvalho Moutinho, Luís Filipe Santos Gomes
This ebook describes a model-based improvement strategy for globally-asynchronous locally-synchronous allotted embedded controllers. This method makes use of Petri nets as modeling formalism to create platform and community self sufficient types aiding using layout automation instruments. To help this improvement process, the Petri nets type in use is prolonged with time-domains and asynchronous-channels. The authors’ procedure makes use of versions not just offering a greater realizing of the disbursed controller and bettering the communique one of the stakeholders, but in addition to have the capacity to aid the complete lifecycle, together with the simulation, the verification (using model-checking tools), the implementation (relying on automated code generators), and the deployment of the disbursed controller into particular platforms.
- Uses a graphical and intuitive modeling formalism supported by way of layout automation tools;
- Enables verification, making sure that the dispensed controller used to be properly specified;
- Provides flexibility within the implementation and upkeep levels to accomplish wanted constraints (high functionality, low strength intake, diminished costs), allowing porting to various systems utilizing diverse communique nodes, with no altering the underlying behavioral model.
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Extra resources for Distributed Embedded Controller Development with Petri Nets: Application to Globally-Asynchronous Locally-Synchronous Systems
This means that each transition can be target of a communication channel. cs, a partial function identifying a set of transitions as being channel sources (sources of communication channels): cs W T 0 ! 6) where CS is the set of channel targets. is, a partial function associating transitions with Boolean expressions: is W T 0 ! 7) where BE is the set of Boolean expressions checking input signal values. os, a partial function associating places with assignment expressions: os W P0 ! AE/ is the power set of AE, and AE is the set of assignment expressions assigning the result of mathematical expressions to output signals.
The difference is that they report different events in the source components: • the SimpleAC sends a message whenever its source transition fires; • the AckAC sends a message whenever its source transition fires receives a message; • the NotAC sends a message whenever its source transition fires receives a message but does not fire (because it is disabled). The execution semantics of a Petri net model with asynchronous-channels (such as the one presented in Fig. 5) can be expressed through a Petri net model where the asynchronous-channels were replaced by behaviorally equivalent sub-models (such as the one presented in Fig.
This algorithm, which was implemented in the IOPT-Tools, generates the state-spaces and saves them into hierarchical XML files. To analyze and verify the state-spaces (searching proprieties), standard tools for XML, like XPath and XQuery (W3C 2013) and the IOPT query engine (Pereira et al. 2012a) can be used. The state-spaces support not only the behavioral verification, but can also provide the places bounds, which are the sizes of the memory resources needed to implement the controllers. translatedPN/ The state-space of the model from Fig.