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ABSTRACT This system experimentally verifies that a multiple client–server architecture based on switched Ethernet can be used as a real-time communication standard for possible applications in factory automation, by observing the effects of packet delays, network congestion, and packet loss on the performance of a networked control system (NCS). The NCS experimental setup used in this research involves real-time feedback control of multiple plants connected to one or more controllers over the network. A multi-client–multi server (MC–MS) architecture on a local area network (LAN) was developed using user datagram protocol as the communication protocol. In the single-client–single-server (SC–SS) system, as the Ethernet link utilization increased over 82%, the average packet delays and steady-state error of a dc motor speed-control system increased by 2231% and 304%, respectively
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SWITCHED ETHERNET-BASED REAL-TIME NETWORKED
CONTROL SYSTEM WITH MULTIPLE-CLIENT–SERVER
ARCHITECTURE
ABSTRACT
This system experimentally verifies that a multiple client–server architecture
based on switched Ethernet can be used as a real-time communication standard for
possible applications in factory automation, by observing the effects of packet delays,
network congestion, and packet loss on the performance of a networked control system
(NCS). The NCS experimental setup used in this research involves real-time feedback
control of multiple plants connected to one or more controllers over the network. A
multi-client–multi server (MC–MS) architecture on a local area network (LAN) was
developed using user datagram protocol as the communication protocol. In the single-
client–single-server (SC–SS) system, as the Ethernet link utilization increased over 82%,
the average packet delays and steady-state error of a dc motor speed-control system
increased by 2231% and 304%, respectively. As the link utilization increased beyond the
threshold, employing an additional server in the NCS reduced average packet delays
and also overcame the negative effects of Ethernet’s flow control mechanism. The MC–
MS architecture is tested with artificially generated random packet loss. The standard
deviation of steady-state error (SSE) at 80%utilizationwith packet loss is found to be
70.2% less than SC–SS and 200% less than multi-client–single server architecture. The
MC–MS architecture remained stable till 70% of control or measurement packet loss.
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Office Address: No 4 / Flat No 3D, Sai Kiran Apts, First Main Road, Kasturba Nagar, Chennai-20 web: www.zebros.in e mail : [email protected] mob: 99400 98300,9500075001
DESCRIPTIONS
In this system, a similar switched Ethernet network is used. Although previous
researchers, found a switched network to be more effective than conventional Ethernet,
in this system we present an in-depth experimental analysis by comparing three types
of switched network architecture under varying network load and packet loss
conditions. It is found that MC–MS architecture performed better with the lowest
packet delays and standard deviation of SSE.
The performance of a network is measured in various factors such as average
delay, throughput, channel capacity, stability, and fairness. It is important to
differentiate these performance measures with respect to different types of networks.
For example, in a real-time system, average delay and network load may be the most
important performance measures whereas in a non-real-time system, throughput and
channel capacity may be more important.
The performance measures studied in this research are average delay (Tav), and
Ethernet link utilization. It is worthwhile to clarify that in a switched Ethernet network,
the load on the network translates to the communication load on the link between a
client, switch and a server. This network load is amply accounted through the Ethernet
link-utilization parameter. Throughput is defined as the amount of bandwidth available
for a network application during a given time and this is complementary to the
measured link utilization.
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The Institute of Electrical and Electronics Engineers or IEEE (read eye-triple-e) is Incorporated in the State of New York, United States. It was formed in 1963 by the merger of the Institute of Radio Engineers (IRE, founded 1912) and the American Institute of Electrical Engineers (AIEE, founded 1884). A membership organization comprised of engineers, scientists and students that sets standards for computers and communications. It is a nonprofit organization with more than 365,000 members in around 150 countries.
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0th Review 1st Review
Abstract Existing System Disadvantages Proposed System Advantages Objective System Requirements System Architecture
Literature Survey Module List Module Description Data Flow Diagram Level DFD Module Wise DFD Problem Definition Review Document Explanation
2nd Review 3rd Review
Use case Diagram Class Diagram Collaboration Diagram Sequence Diagram Activity Diagram Testing & test cases Partial Code Screenshot for First two
module Review Document Explanation
Conclusion References Future Enhancement 65% code (Executable Format) Required Software Review Document Explanation
Final Review
Complete Code with Enhancement
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