Proceedings ArticleDOI
Enhancements to the time synchronization standard IEEE-1588 for a system of cascaded bridges
Jurgen Jasperneite,K. Shehab,Karl Weber +2 more
- pp 239-244
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TLDR
In this paper, a bypass clock instead of the boundary clock is proposed as an enhancement of the IEEE-1588 standard for bridged networks, where the local clock adjustment can be modeled by a corresponding control loop.Abstract:
The IEEE-1588 standard for a high precision time synchronization now exists since 2002. For using this standard in bridged networks a so-called boundary clock is defined, where the local clock adjustment can be modeled by a corresponding control loop. At the field level of industrial automation systems, the line topology is very important. By using Ethernet at the field level, the resulting chain of bridges leads to a cascade of control loops and may lead to instabilities and deviations of the distributed clocks, which are not acceptable. For this application a bypass clock instead of the boundary clock is proposed as an enhancement of the IEEE-1588 standard. The effectiveness of this extension to be evaluated by simulation technique.read more
Citations
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Proceedings ArticleDOI
Investigation of Industrial Environmental Influences on Clock Sources and their Effect on the Synchronization Accuracy of IEEE 1588
TL;DR: The objective is to derive coherences and rules for the implementation of functional components of the synchronization procedure for the Industrial Ethernet system PROFINET from exemplary measurements at a crystal oscillator with different temperature and mechanical loads.
Proceedings ArticleDOI
Application of IEEE 1588 to the measurement of synchrophasors in electric power systems
TL;DR: This paper investigates the possibility of using the PTP (Precision Time Protocol) defined in the Standard IEEE 1588 for applications in electric power system, with reference to one of the most challenging measurement problems, i.e. the measurement of synchrophasors.
Patent
Robot coordinated control method and system
Yoshiki Hashimoto,Ohya Tomoki +1 more
TL;DR: In this article, a reference signal is transmitted from one of a plurality of robot control devices connected by communication connecting device to the other robot control device, and the timing of generation of an operation basic period signal in each of the other robotic control devices is synchronized with the timing in the one of the plurality of robots.
Patent
Portable Articulated Arm Coordinate Measuring Machine Having Integrated Software Controls
TL;DR: In this paper, the authors present a method for performing a diagnostic or calibration procedure on a portable articulated arm coordinate measurement machine (AACMM), which includes a manually positionable articulated arm portion having opposed first and second ends, the arm portion including a plurality of connected arm segments, each of the arm segments including at least one position transducers for producing position signals.
Book ChapterDOI
Industrial Communication Protocols
TL;DR: The chapter presents the main wired and wireless industrial protocols used in industrial automation, manufacturing, and process control applications and the concept of virtual automation networks is presented.
References
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The omnet++ discrete event simulation system
TL;DR: OMNeT++ is fully programmable and modular, and it was designed from the ground up to support modeling very large networks built from reusable model components.
Journal ArticleDOI
Internet time synchronization: the network time protocol
TL;DR: The NTP synchronization system is described, along with performance data which show that timekeeping accuracy throughout most portions of the Internet can be ordinarily maintained to within a few milliseconds, even in cases of failure or disruption of clocks, time servers, or networks.
Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems
Kang B. Lee,J Eldson +1 more
TL;DR: A protocol is provided in this standard that enables precise synchronization of clocks in measurement and control systems implemented with technologies such as network communication, local computing, and distributed objects.
Proceedings ArticleDOI
IEEE 1588 standard for a precision clock synchronization protocol for networked measurement and control systems
J C. Eidson,Kang B. Lee +1 more
TL;DR: This paper discusses the major features and design objectives of the IEEE-1588 standard, designed to serve the clock synchronization needs of industrial systems, and recent performance results of prototype implementations of this standard in an Ethernet environment are presented.
Journal ArticleDOI
Precision synchronization of computer network clocks
TL;DR: In this article, the authors describe a series of incremental improvements in system hardware and software which result in significantly better accuracy and stability, especially in primary time servers directly synchronized to radio or satellite time services.