Abstract
The introduction of Ethernet makes the distributed network system more flexible and efficient, but it also makes nodes which are far apart from each other unable to work in the same time basis due to the long distance. This is not allowed for the high performance requirements of the system synchronization, such as high-precision multiaxis machining system. This paper presents a high-precision network clock synchronization algorithm, namely, optimal PI clock servo, which imposes a PI controller in order to compensate for the clock drift of each network node. Then a simulation platform established by the toolbox TrueTime is used to verify the stability of the algorithm and compare it with the clock synchronization algorithm of EtherCAT. The results show that the new synchronization algorithm has higher synchronization precision and faster convergence rate.
Highlights
A distributed system is the kind of system that has spatial distribution of processors and performs a certain function by exchanging information through the network system
This paper presents a new frequency compensation algorithm called PI clock servo
The frequency compensation problem is modeled as a control problem and the control theory approach is imposed to design a PI controller
Summary
A distributed system is the kind of system that has spatial distribution of processors and performs a certain function by exchanging information through the network system. Software synchronization algorithms use standard communication network, making the system obtain synchronization by sending synchronization information. Each processor estimates global system time by exchanging clock information via messages and adjusting its own clock . This generally imposes a substantial time overhead on the system and results in loose synchronization, so it cannot provide the same accuracy of synchronization as hardwarebased clock algorithms
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