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Modeling Tasks Synchronization in the Fault-Tolerant Cyber-Physical Systems

The model of tasks interaction in a Cyber-Physical System (CPS) is developed and discussed in the paper. To achieve fault-tolerant behavior the intermediate synchronization objects are used for decoupling interacting tasks. Synchronization protocol is modeled as guarded actions with help of Temporal Logic of Actions (TLA). The guard is a logical condition which includes not only software specifications, but physical properties of a CPS. Different temporal semantics (non-waiting, waiting and waiting timeout) of tasks synchronization in a CPS are introduced. The effect of synchronization in the case of different time semantics of tasks actions is analyzed. Keywords-Cyber-physical system, tasks synchronization, faulttolerant behavior, temporal logic of actions.