With the actual implementations in many plants and absolutely high reliability, CENTUM CS has been the best seller of the large scale DCS since its first sale in 1993.
Since it was released in 1993, CENTUM CS is widely applied in the plants of oil refinery, petrochemical, chemistry, iron and steel, non-ferrous metal, metal, cement, paper pulp, food and pharmaceutical industries, and power, gas and water supply as well as many other public utilities.
The excellent operability and engineering technique, and the high reliability proved by the abundant actual application results, guaranteed that the CENTUM CS will continue to play an important role in the 21st century.
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|System Configuration Drawing|
Information Command Station (ICS)
A station for operating and monitoring the plant process control.
Console Type ICS
A standard type of ICS with extensive capability and high reliability.
The ICS on the desktop, the main body, CRT and keyboard are separated.
A general-purpose PC used as ICS.
Field Control Station (FCS)
The control unit for plant process control
A remote input and output unit that passes the field signals to FCS control unit via remote buses.
|System Configuration Drawing|
Engineering Work Station (EWS)
A workstation with engineering capabilities used for system configuration and system maintenance.
Bus Converter (ABC)
Bus converters are required if a system contains multiple domains or contains the legacy CENTUM project.
Communication Gateway (ACG)
A communication gateway unit is for linking a supervisory computer to control bus.
V Net Real time control bus for linking FCS, ICS and ABC.
E Net The information LAN of the system for linking ICSs and EWS.
High reliable hardware that guarantee the plant control in stabilized status, the most important goal for plant control.
The FCS inherits the renowned reliability of the entire CENTUM series. Truly the most reliable FCS in the industry.
Since the processor cards perform control calculations, duplexes dual-redundant configuration of these cards is essential to prevent loss of control upon a hardware failure.In addition, two CPUs are paired in each processor card, thus the transient calculation errors can be detected. (This type of duplexes dual-redundant configuration is referred to as "Pair & Spare" configuration.)
In order to meet various requirements, in the FCS lineup, standard type, compact type and migration type FCSs are available for space saving installation, and high-distributed type FCS is also available for decentralized control structure.
|Console Type ICS|
Yokogawa provides three types of ICS to match your needs.
Console Type ICS
The Console type ICS is an operator console designed based on the human engineering with extensive capability and high reliability. It has one CRT or two stacked CRTs which support touch-panel function and eight-loop simultaneous manipulation.
A space-saving type of ICS with extensive capability and high reliability.
The ICS is a general-purpose personal computer with UNIX operating system. It also has space-saving advantage.
|Dedicated Operator keyboard|
The dedicated operator keyboard for PHIS is assembled with the dustproof and drip-proof flat keys, and the keyboard maintains the same functionality as the operator keypad fixed atop the console type ICS
By pursuing the ease of using for the operation and monitoring functions, it creates a reliable operation environment where the operation status of a plant can be exactly reflected.
The widely praised graphic panel, trend panel and other CENTUM series operation panel are provided. The typical operation panels are explained as follows.
|Graphic Panel||Overview Panel|
|Control Panel||Trend Panel|
Up to ten panels can be tiled or cascaded on display. Since the panels with the required information can be promptly switched, the speedy operation and monitoring becomes possible.
By shrinking the size of panels to one fourth, four panels can be displayed on one screen.
The graphic panel 4-time large and 1.5-time large in the screen can be monitored by moving the scroll bars for displaying the desired contents.
Yokogawa Electric Corporation has completed a unique control system project in Arcadia, Florida, which is located in the heart of a beautiful citrus-growing region. Peace River Citrus Products has installed a Yokogawa CENTUM CS 1000 R3 control system to control a proprietary orange juice production process at its citrus processing plant.
The Itoigawa Power Plant was constructed adjacent to a cement plant in Itoigawa City, Niigata Prefecture, and is operated by an IPP that supplies electricity to Tohoku Electric Power, one of Japan's major power companies. The use of a 149 MW coal-fired CFB boiler in this power plant is a first for an IPP in Japan, and this effectively reduces NOx emissions.
Nishi Nippon Environment Energy Co., Inc. was founded in 1990 with the concept of a full, safe and comfortable urban life by harmonizing the global environment with energy-savings. Also, as a total energy industry corporation, which is promoting the efficient use of heat energy for the region, it is developing a broad business on the theme of civic improvement in the 21st century by preparing a stable city infrastructure.
Based in Japan's Nagano Prefecture, Miyota Co., Ltd. is a developer and manufacturer of precision-processed electronic components whose principal business lines are wristwatches, quartz crystal oscillators, and electronic video components such as LCD backlights and microdisplays.
The construction of Tuas Power Station started in the mid 1990s. The plant has steadily grown to be a significant player in the competitive Singaporean electricity market. Stage One of Tuas Power Station is equipped with the country's largest steam generators which are capable of producing 600 MW each.
PetroChina Guangxi Petrochemical Company has completed construction of a combined refinery and petrochemical production complex in Qinzhou, a port city in China's Guangxi Autonomous Region. With a 10 million ton per year capacity, the refinery is one of China's largest, and is truly world class, using a highly advanced hydrogenation process, with the main process technologies coming from the USA and France.
The 2008 Frost & Sullivan Asia Pacific Company of the Year Award for Distributed Control System (DCS) market is presented to Yokogawa. Yokogawa is the market leader with a dominant market share in the Asia Pacific market.
For the liquefied natural gas (LNG) industry, which has witnessed healthy growth and large project investments over the last few years, Asia is right at the center of the action. Whenever any sector booms in the economy, as is the case with the liquefied natural gas (LNG) production-transport-gasification distribution network the world over, there is a concomitant growth in the demand for automation solutions.
As a world's leading supplier of instruments and control systems for industrial process automation, Yokogawa has committed itself to the development of advanced solutions and products in three focused areas – measurement technologies, industrial automation and control, and information technologies.
Martin te Lintelo, Yokogawa Europe B.V., The Netherlands, discusses high level control system design for LNG receiving terminals. As demand for LNG increases worldwide, players face seemingly conflicting challenges. On one hand, they must expand capacity in different regions, make the business and production as agile and adaptive as possible, and improve operational efficiency.
Environmental friendliness (E) must be assessed in today's product design in addition to the conventional design considerations of quality (Q), cost (C), and lead time (D). Hence, the product design system must be urgently restructured in order to minimize the environmental impact of a product throughout its life-cycle from purchase of the materials and parts, through manufacturing and distribution, to use and disposal.
The manuals of control systems such as a DCS provide a vast amount of information depending on their multi-functionality and functional integration. A conventional large-scale control system our company offers comes with more than 10,000 pages of paper documents.
To improve efficiency and quality in the DCS application coding and inspection phases for an entire CENTUM CS system, engineering tools have been developed, along with the training required to operate these tools. In consideration of the time needed for development, the need for adequate operability, the basis of standard CS software architecture, and the use of freeware (e.g., Perl2 and Tcl/Tk3), we began development of these engineering tools with the objectives to reduce development costs and increase efficiency.
A fieldbus is a bidirectional, multidrop, digital communication system developed to replace the conventional 4-20 mA communication lines that connect intelligent field devices with a control system. Fieldbus is continually reviewed in an effort to standardize the fieldbus specifications to comply with the specifications of the IEC and ISA.1
The development of communications technologies has formed a system structure known as the communication network. This network has not only established itself in the industrial world but also in the general household. The recent spread of technologies such as the Internet has been quite spectacular.
One of Yokogawa's corporate philosophies is to contribute to society through broad-ranging activities in the areas of measurement, control, and information. To achieve this philosophy in the control industry, Yokogawa launched CENTUM, the world's first distributed control system (DCS), in 1975.
A communication system for connecting stations in the system plays an important role in a distributed control system (DCS). The communication system determines the superiority or inferiority of the entire control system. In DCS communication as represented by CENTUM, a token-passing system and dual bus have been developed.
The phenomenon of the current era, coined the information age, involves a global trend toward digital technology and open architecture. Field devices are no exception to this trend.
As controlled objects have become more complex, plant operation schemes more concentrated, and plant operators fewer in number, the degree of engineering for a distributed control system (DCS) has both multiplied and diversified. Despite this, systems are required to be configured in a shorter time while engineering results are required to be of higher quality.
The number of work steps involved in engineering a batch process tends to become extremely large compared to continuously controlled processes, if the work is automated using a DCS. This is due to the nature of batch processes and the plants that handle these processes.
Recipe management software refers to the computer software used to manage product names and their corresponding recipes and set the recipe data in the control system in order to control the operations of a plant in which multiple materials are blended to manufacture a number of different products.
The development of the CENTUM CS 1000 distributed control system for small- and medium-scale plants was based on two basic design principles: 1) to have the same architecture as the CENTUM CS and 2) with the objective of becoming a global product.
As for a controller used in a distributed control system (DCS) shown in Figure 1, covering as many applications as possible with a single controller will bring cost reduction effects such as easy engineering and a small controller installation area. Therefore, the controller is required to process large amounts of data more quickly.
The power generation facility in a pulp and paper plant is comprised of units, each of which is composed of a boiler, a turbine, a generator, and auxiliary equipment, and these pieces of equipment were traditionally controlled on a unit/equipment basis. This paper presents an application of CENTUM, Yokogawa's distributed control system (DCS) that integrates the independent control systems of such power generation facilities to achieve labor saving through operations via CRT display and keyboard.
In order to run 24 hours a day in large-scale plants, such as an oil-refinery or others, a distributed control station (DCS) requires high reliability. In the CENTUM DCS from Yokogawa Electric Corporation, high reliability of each device and a network (bus) connecting devices have been realized by using techniques such as a dual CPU, dual I/O, and a dual communication bus since sales began in 1975.
FCSs, the control stations in a CENTUM CS system, have already demonstrated that they are highly reliable, effective and maintainable. These advantages are the result of such features as the dual-redundant hardware configuration, the online modification of application data, and so on.
Industrial automation (IA) systems and products, which utilize measurement, control and information technologies, are used across the world as fundamental infrastructure for achieving safe, stable and highly efficient plant operation. In order to keep the systems and products effective throughout the plant lifecycle, customers need to periodically check their effectiveness and take prompt action if any problem is identified.
Report functions in process control are often positioned as part of the logger functions. However, plant operation data in a batch process should be not only logged regularly but also acquired and managed for each batch execution. The report function for logging plant operations in a batch process mainly comprises a function to print out plant operation data collected for each batch execution, and there are various approaches available to implement this function.
Since their conception in 1975, distributed control systems (hereinafter, referred to as DCSs) have been changed drastically in accordance with the rapid advancements in computer technology. In terms of hardware technology, the development of microprocessors, memory devices, and communication devices has been significant in regard to both quality and quantity.
For a transfer system in a plant, such as a transfer between tanks in a brewery, the transfer of pellets in a pneumatic transport system, or the transfer of oil at an offsite location, it is necessary to monitor the open/close status of valves or the on/off status of motors or blowers in reference to the transfer pattern (a combination of the transfer source(s) and destination(s), route, etc.).
Due to emerging competitors from the rapidly growing countries such as India and China and the global economic downturn triggered by the Lehman shock, many companies in the process industries are struggling to survive the severe global competition.
The operation and monitoring functions of a plant control system are important means of understanding the condition of the plant and how it operates. Traditionally, user needs for the system focused on such features as increased operability and durability. As a result, these functions were developed for a dedicated machine in the form of dedicated human-machine interface software.
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