FMEA in the Development of Layered Mode Sample Clauses

FMEA in the Development of Layered Mode. Rich Control Systems In our work on ensuring mode consistency of AOCS we have relied on the mode logic that has been defined a priori. However, often mode logic has to be defined by the system developers. To facilitate this process we proposed a structured approach to defining fault tolerance part of mode logic, e.g. backward mode transitions. Embedded control systems typical for space sector are often developed in a layered fashion, which provides the designers with a convenient mechanism for structuring the system behaviour according to the identified architectural layers. Each software component in layered mode-rich systems can be viewed as a mode manager. Let us assume that the scenario defines how to bring a system from the non-operational mode to the most advanced mode. Such a forward mode transition scenario is usually given in the system requirements document. The implementation of the mode transition scenario can be interrupted either by transitional errors (i.e., errors that appear during a mode transition step) or unit usability errors (i.e., errors that occur when a unit performs below its required level). When the mode manager (MM) chooses a new target mode, it initiates the corresponding mode transitions in the lower layer unit managers (UMs). If an error is detected, the corresponding unit manager assesses the error and either initiates error recovery by itself or propagates the error to MM. MM, in its turn, makes a decision how to handle such an error. This decision usually involves rolling back to some less advanced (i.e., degraded) mode. To systematically define the rollback procedures for each mode, we proposed to conduct Failure Modes and Effects Analysis (FMEA). FMEA is a well-known inductive safety analysis technique. For each system function or component, it defines possible failure modes, local and system effects, as well as detection and recovery procedures. The information is collected in a table form. The traditional FMEA allows us to discover and structure failure modes of components. We propose to conduct FMEA of each operational mode. Therefore, we tailor FMEA to fit our purposes. In our work [RD20] (see also [RD16] and [RD19]) we have proposed a systematic approach to deriving the fault tolerance part of a mode logic using FMEA. Also, we have formalised the required conditions of mode consistency and demonstrated how to ensure them while developing a system by refinement in Event-B. Verification by theorem proving and stepwis...
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