Functional and Operational Solutions for Safety Reconfigurable Embedded Control Systems
The chapter deals with run-time automatic reconfigurations of distributed embedded control systems following component-based approaches. We classify reconfiguration scenarios into four forms: (1) additions-removals of components, (2) modifications of thei
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Abstract The chapter deals with run-time automatic reconfigurations of distributed embedded control systems following component-based approaches. We classify reconfiguration scenarios into four forms: (1) additions-removals of components, (2) modifications of their compositions, (3) modifications of implementations, and finally (4) simple modifications of data. We define a new multi-agent architecture for reconfigurable systems where a Reconfiguration Agent which is modelled by nested state machines is affected to each device of the execution environment to apply local reconfigurations, and a Coordination Agent is proposed for any coordination between devices in order to guarantee safe and coherent distributed reconfigurations. We propose technical solutions to implement the whole agent-based architecture, by defining UML meta-models for agents. In the execution scheme, a task is assumed to be a set of components having some properties independently from any real-time operating system. To guarantee safety reconfigurations of tasks at run-time, we define service and reconfiguration processes for tasks and use the semaphore concept to ensure safety mutual exclusions. We apply the priority ceiling protocol as a method to ensure the scheduling between periodic tasks with precedence and mutual exclusion constraints.
A. Gharbi (B) · M. Khalgui INSAT, Tunis, Tunisia e-mail: [email protected] M. Khalgui e-mail: [email protected] M. A. Khan Sharda University, Gr. Noida, India e-mail: [email protected]
M. A. Khan et al. (eds.), Embedded and Real Time System Development: A Software Engineering Perspective, Studies in Computational Intelligence 520, DOI: 10.1007/978-3-642-40888-5_10, © Springer-Verlag Berlin Heidelberg 2014
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1 Introduction Nowadays, the new generations of distributed embedded control systems are more and more sophisticated since they require new forms of properties such as reconfigurability, reusability, agility, adaptability and fault-tolerance. The first three properties are offered by new advanced component-based technologies, whereas the last two properties are ensured by new technical solutions such as multi-agent architectures. New generations of component-based technologies have recently gained popularity in industrial software engineering since it is possible to reuse already developed and deployed software components from rich libraries. A Control Component is a software unit owning data of the functional scheme of the system. This advantage reduces the time to market and allows minimizations of the design complexity by supporting the system’s software modularity. This chapter deals with run-time automatic reconfigurations of component-based applications by using multi-agent solutions. An agent is assumed to be a software unit allowing the control of the system as well as its environment before applying automatic reconfigurations. The reasons for which reconfigurations may be taken are classified into two categories [33]: (1) corrective reasons: if there is on
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