Consistent sensor values on a real-time ethernet network

2016 ◽  
Author(s):  
Daniel Hallmans ◽  
Kristian Sandstrom ◽  
Thomas Nolte ◽  
Stig Larsson
Keyword(s):  
Real Time ◽  
Ethernet Network

Trust Measurement Model for Industrial Control Ethernet Network

2011 ◽  
Vol 268-270 ◽  
pp. 1568-1573 ◽  
Author(s):  
Sen Xin Zhou ◽  
Jiang Hong Han ◽  
Hao Tang
Keyword(s):  
Real Time ◽  
Computer Network ◽  
Evaluation Model ◽  
Measurement Model ◽  
Industrial Applications ◽  
Industrial Control ◽  
Control Command ◽  
Network Operation ◽  
Ethernet Network ◽  
Improved Performance

The application of fieldbus has been limited due to the high cost of hardware and the difficulty in interfacing with multivendor products. In order to solve these problems, the computer network technology, especially Ethernet, is being adopted by the industrial automation field. The key technical obstacle for Ethernet for industrial applications is that its nondeterministic behavior makes it inadequate for real-time applications, where the frames containing real-time information, such as control command and alarm signal, have to be delivered within a certain time limit. Recently, the development of switched Ethernet shows a very promising prospect for industrial applications due to the elimination of uncertainties in the network operation that leads to the dramatically improved performance. We propose a trust evaluation model for industrial control ethernet network . Our study shows the importance and necessity of applying theoretical analyses to understand the complex characteristics of trusted industrial control ethernet networks.

scholarly journals Performance evaluation of embedded ethernet and Controller Area Network (CAN) in real time control communication system

2019 ◽  
Vol 8 (1) ◽  
pp. 36
Author(s):  
Ching Chia Leong ◽  
Mohamad Khairi Ishak
Keyword(s):  
Real Time ◽  
Network Models ◽  
Controller Area Network ◽  
Performance Criteria ◽  
Automotive Application ◽  
Media Access Control ◽  
Control Network ◽  
Area Network ◽  
Average Delay ◽  
Ethernet Network

<span lang="EN-US">Real-time communication is important in control network. In real-time communication, message need to be delivered from source to destination within specification. Embedded Ethernet and Controller Area Network (CAN) protocol can be used in control network to achieve hard real-time communication. For embedded Ethernet protocol, Carrier Sense Multiple Access with Collision Detection (CSMA/CD) is the media access control (MAC) used to control data transmission between nodes in network. Back-off algorithm in CSMA/CD is used to handle packet collisions and retransmission. For CAN protocol, it is communication protocol developed mainly for automotive application. It has priority arbitration to handle collisions and retransmission. In this project, embedded Ethernet network models and CAN network models are developed and simulated in MATLAB Simulink software. Several back-off algorithms, which are Binary Exponential Backoff (BEB), Linear Back-off Algorithm, Exponential-Linear back-off Algorithm and Logarithm Back-off Algorithm are proposed and implemented into Embedded Ethernet network model to evaluate the performance. Both embedded Ethernet and CAN network models are extended to 3 nodes, 10 nodes, and 15 nodes to evaluate performance at different network condition. The performance criteria evaluated and discussed are average delay and jitter of packets. The results show that in network with high number of nodes, Linear Back-off Algorithm and Exponential-Linear back-off Algorithm shows improvement in packets delay and jitter. For CAN network, the packet jitter is relatively low.</span>

Real-time electroholography using a single spatial light modulator and a cluster of graphics-processing units connected by a gigabit Ethernet network

2020 ◽  
Vol 18 (2) ◽  
pp. 020902
Author(s):  
Hiromi Sannomiya ◽  
Naoki Takada ◽  
Tomoya Sakaguchi ◽  
Hirotaka Nakayama ◽  
Minoru Oikawa ◽  
...  
Keyword(s):  
Real Time ◽  
Graphics Processing Units ◽  
Spatial Light Modulator ◽  
Light Modulator ◽  
Gigabit Ethernet ◽  
Ethernet Network ◽  
Graphics Processing

Some Recent Results in Quiescent Prominence Spectrometry

1979 ◽  
Vol 44 ◽  
pp. 41-47
Author(s):  
Donald A. Landman
Keyword(s):  
Real Time ◽  
Computer System ◽  
Spectral Response ◽  
Absolute Intensity ◽  
Solar Observatory ◽  
Target Size ◽  
Small Target ◽  
Signal Averaging ◽  
Quiescent Prominence

This paper describes some recent results of our quiescent prominence spectrometry program at the Mees Solar Observatory on Haleakala. The observations were made with the 25 cm coronagraph/coudé spectrograph system using a silicon vidicon detector. This detector consists of 500 contiguous channels covering approximately 6 or 80 Å, depending on the grating used. The instrument is interfaced to the Observatory’s PDP 11/45 computer system, and has the important advantages of wide spectral response, linearity and signal-averaging with real-time display. Its principal drawback is the relatively small target size. For the present work, the aperture was about 3″ × 5″. Absolute intensity calibrations were made by measuring quiet regions near sun center.

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