Introduction to the DCS and its architecture

3. 1 DCS is the definition of DCS distributed control system ( 分布式控制系统) Short, also known as distributed control system, which is developed by the loop instrument control system, is in the computer, communication, control, and CRT technology on the basis of rapid development. 3. 2 DCS development since the 1960 s, as the production engineering more and more complicated, the birth of computer centralized monitoring and control system of centralized control. Centralized control is convenient for monitoring, operation and management, as well as the risk highly concentrated, once the system failure, the effects on the device and the risk is very big. With the birth of the microprocessor, for the opening of new control system has created the extremely advantageous conditions. In 1975, along with the computer, communication, control and CRT 4 c technology unceasing development and perfection, for the first time the United States honeywell to the global launch of the TDC - distributed control system 2000, since the birth of the first set of DCS, the DCS system has gone through three stages of development. From 1975 to 1980 as the start-up stage. At this time due to the limitation of hardware and software technology, the DCS system performance is not very perfect, the hardware structure is not very mature. From 1981 to 1987 for the second phase. Fault tolerance during this period, redundancy technology is mature, system reliability is high, the performance is very superior, all kinds of control functions is very rich. In the stage of DCS from the simple industrial process automation control to the production and management automation development. This generation of DCS main LAN ( 局域网) Technology, introducing the function of DCS network greatly strengthened. Since 1987 for the third stage of development. Each manufacturer USES the international organization for standardization ( iso) Open systems interconnection ( osi） Structure based on manufacturing automation protocol ( 地图) To solve the problem of different models of interconnection. DCS system on hardware use more advanced CPU and redundant technology, storage capacity and communication speed is greatly improved, in the light of the general operating system software. DCS in this phase of the organic combination of scheduling control, supervision and management, realize the automation management of various kinds of production and management information. 3. Characteristics and functions of the DCS (3 1) The main characteristics of DCS. DCS has the following main features: separation of control and display; The network communication technology; A complete open system; High reliability; Have a comprehensive and professional; Realize the man-machine dialogue technique; Flexible system extension; Management ability. ( 2) The main function of DCS. DCS system can be a very good complete industrial continuous control, loop control instrument, DCS years of practice showed that its in the field of continuous control has become a mature technology and perfect control system, at the same time, the friendly man-machine interface, based on the reliability of redundant technology, powerful network function, a single database, flexible configuration, etc by the vast number of users praise. 3. 4 DCS development trend of the DCS has the extremely important status in the field of continuous control, so far, for DCS has much dispute over the question of future development, but the following a few questions most know that DCS is an urgent need to solve the problem; ( 1) Openness. About openness, this problem is a lot of factors which restrict the development of the DCS, DCS each manufacturer for their own network protocol and system software to take strict security measures, if other factory which creates a PLC or other control equipment can not be very good seamless access to DCS control system, often need to go through complex protocol conversion, the communication rate and communication ability is not ideal, such as honeywell TPS system and the ab 5 series PLC communication requires both for communication via a serial port and ancillary equipment developed to do this, but when large amounts of communication, the real time is greatly reduced, this problem is hindered the application of DCS and competitiveness. Some DCS manufacturers have realized the seriousness of the problem, the current manufacturer of honeywell PKS control system adopted controlnet communications network, abandoned the traditional LCN network, and takes the form of the server structure, make its openness is greatly enhanced. Apart from communication problems, the operating system, database, man-machine interface, control strategy configuration, etc. , there are open questions, so as technology advances, the openness of the DCS to strengthen gradually, but also should play its characteristics, make the distributed computer control system, liberated from the traditional DCS, the DCS layer and cips system scheduling, management, policy makers, Assist decision-makers) Seamless connection, to upload information about DCS, the real-time database, historical database is Shared by the above three layers, avoid duplication of database construction, build the platform for advanced control and optimization, and the top of a relational database to share data, integrated control truly. ( 2) The price. About the price, of course, should from the cost performance, and the user of the product life cycle according to the requirements of the actual production equipment control to the selection of DCS, engineering cost, maintenance cost and so on comprehensive consideration. More important is the PLC controller systems, industrial control system ( ipc） Is famous for its price is cheap, so the situation facing the DCS vendor in this respect is very serious, DCS in the future should be to reduce the development cost, reduce maintenance costs, remote diagnosis and maintenance work harder and perfect service system and cope with competition in the PLC controller and ipc.
Most people who see a in operation for the first time are amazed at how well the plc controller price is managed.
No, this isn't a wonder product and it won't be likely to change your life but it will give your programmable control systems a kick and bring the extraordinary to the every day. give it a shot at Coolmay PLC.
Unlike the plc controller price, the is more flexibly used in accasions where programmable control systems .
Did I make the right decision? Am I saving money? Would I do it this way again? Yes, yes and yes if you choose to visit Coolmay PLC and make your enquiry.