Research on synchronous control of nodes in distributed network system

The distributed network systems have been used widely in complicated electric drive and Mecatronics control systems. The research on synchronization control of distributed network nodes has been a hot point. This paper focuses on the hot point, synchronization environment and synchronization object are discussed firstly. And then, the concepts of activating and deactivating to the program of network nodes are proposed. In order to solve the problem of isochronous data sampling or isochronous drive output, we propose a novel kind of control idea of synchronization, which include dividing slavepsilas main loop program into several processes and adopting twice trigger signals to activate synchronization control. Besides, we analyze the time characteristics of synchronous executing of nodes. Finally, we make a dissection to the realization method of synchronization control in PROFIBUS-DP master-slave network system, and discuss briefly their conditionality in actual application. By compiling application program according to idea proposed by this paper, high isochronous control demand can be satisfied for distributed nodes in many cases.