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A recent trend in networked control systems is to interconnect the
distributed elements by means of a multipoint broadcast network,
instead of using the traditional point-to-point links. Within
industrial communication systems, industrial networks are specially
intended for the interconnection of process controllers, sensors,
and actuators, at the lower levels of the factory automation
hierarchy. It is known that time constraints are more stringent as
we go down in the automation hierarchy. In this book, we consider
the application of networked control system in its industrial
environment. Some factors such as message cycle delay, the access
and queuing delays, the transmission time (frame
length/transmission rate), and the protocol processing time all
have effects on control performance.
A recent trend in distributed systems is to interconnect the
distributed elements by means of a multipoint broadcast network.
Within industrial communication systems, fieldbus networks are
especially intended for the interconnection of process controllers,
sensors, and actuators, at the lower levels of the factory
automation hierarchy. This book provides a comprehensive study on
how to use networks to support industrial communication
application. Four parts are roughly included in this book: 1)
Fundamentals in communications and networking technologies with
their developments. 2) Applications of communications and
networking technologies in industry with improvements. 3) Security
for communications and networking technologies in industry. 4)
Trends for communications and networking technologies in the
future. Fundamental theories on communications and networking are
introduced in this book. A hierarchy and construction of networks
for use in industry and some application instances are also
presented. sSome improvement to the application with and networks
are also given. Security problems in networking technologies in
industry are especially addressed in detail, dealing with related
methodologies. Trends for communications and networking
technologies in the future areis analyzed and predicted in the last
part of this book.
Since the beginning of the 1980s, configuration software has
developed and evolved. It should be said that configuration
software, as a kind of application software, rose with the
development of personal computers. The development of configuration
software is closely related to the development of the industrial
control system. With the rapid development of modern industries,
the production process continues to expand in scale, and its
complexity is increasing. The process of industrial production is
now being transformed from labour intensive, equipment intensive,
and information intensive to a more knowledge intensive fashion.
Configuration software as a product appeared in the early 80s, and
was widely used in the late 80s. But before the mid-90s, the
configuration software application was not universal. With the
applications of industrial control systems widely used around the
world, in the face of larger and more complex control systems,
users have become gradually more aware of original host computer
programming. This mode is time-consuming. The loss outweighs the
gains. At the same time, MIS (management information systems) and
CIMS (computer integrated manufacturing systems), and a large
number of applications require an industrial site for enterprise
production, management, and decision-making to provide more
detailed and in-depth data in order to optimize the production and
operation of enterprises in all aspects.
This book provides comprehensive research on the communication
performance of a real time industrial fieldbus. Several important
topics were investigated, such as how to ensure the transmission of
real-time messages within a maximum bound time along the industrial
fieldbus mentioned in this book. Profibus, FF, WorldFIP and CAN are
all well-proved solutions for real-time communication systems,
based on a simplified timed token (TT) protocol and bus scheduling.
The following subjects dealing with the real-time communication
performance of an industrial fieldbus were investigated and studied
in this book. Features: 1) Concept and essentiality of timed-token
MAC protocol with the effect of its parameter in real-time
characteristics; 2) MAC mechanism in Profibus, timing analysis,
optimization of acyclic bandwidth allocation, and the approaches to
guarantee the real-time behaviour of the Profibus protocol; 3)
Principles of acyclic data communication, and analysis of the delay
performance of time-critical and time-available data in FF fieldbus
data link layer token-passing service; 4) Communication models in
WorldFIP network, Producer/Distributor/Consumer concept, response
time analysis for sporadic traffic and investigation of the
worst-case response time issues; 5) Communication mechanism in CAN
fieldbus with its performance analysis and evaluation in real-time
applications. The academic level of this book is relatively high
and professional. It is suitable as a reference for university
graduates, lecturers and researchers.
This book intends to focus on network protocol and communication in
the area of information and industrial control. Various research on
sub-layer protocols including Data Link Layer (DLL), Application
Layer (AL) and User Layer (UL) in instrumentation network and
TCP/IP, Web based protocol for industrial and informatic network
and control problems involving network communication, along with
the design of corresponding system are presented explicitly. The
main objective of this book is to provide information on some
latest research on some mainstream network protocols used in
industry, including fundamental concepts and principles, latest
technological developments, and as the main part, theoretical and
practical research results ever accomplished.
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