Method for time synchronization in communication network for industrial automation system, involves estimating frequency ratio of reference cycle frequency to internal cycle frequency of node

摘要

The method involves performing time synchronization for a portion of a node (SLn) such that a first cycle counting state (Cin) is estimated for a second cycle counting state based on an estimation procedure. A controlled cycle counting state (CT) is determined from the estimated counting state with a linear-quadratic regulator (LQR), based on a controlled system (PL), which comprises a compensation factor as a control variable (CV). Frequency ratio of a reference cycle frequency to an internal cycle frequency of the node is estimated, where the controlled state represents synchronized time. An independent claim is also included for a communication network comprising nodes.