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1 Overview The United States since the launch of the twentieth century sixties programmable logic controller (ProgrammableLogicController, PLC ) Since the control device to replace traditional relay, PLC received a rapid development, is widely used around the world. Meanwhile, PLC function is also improved. With computer technology, signal processing, control technology, the continuous development of network technology and user demand continues to increase, PLC in the switch based on the amount of processing to increase the analog processing and motion control functions. PLC today no longer limited to logic control, motion control, process control and other fields also play an important role.
As the first choice for discrete control, PLC in the eighties to the nineties the twentieth century has been rapid development of the worldwide annual growth rate to maintain PLC 20% to 30%. With the continuous improvement of factory automation and PLC market base continues to expand capacity in recent years, the growth of PLC in the slowdown in industrial countries. However, in China and other developing countries, rapid growth of PLC. Comprehensive information, PLC's 2004 Global Sell Income of 100 billion dollars, in the automation space with a very important position.
Since the seventies of last century since the introduction of PLC, PLC application in China for 30 years. The introduction of early, because PLC is expensive, mainly for the introduction of PLC Metallurgy , Electric power, automated production lines and other major equipment and systems. Over the past 10 years, with the PLC continue to lower prices and growing user demand, more and more began to use small devices to control PLC, PLC application in China increased rapidly. With China's rapid economic development and continuous improvement based on level of automation, the next period of time PLC in China will maintain rapid growth.
PLC products in the importing process, China has organized the relevant units of digestion and absorption of key technologies PLC, PLC to attempt the localization.
However, due to various factors, PLC has not made the formation of industrial scale, China's market over 95% of PLC products from foreign companies.
Came from just one so far, PLC has shown great vitality and rapid growth. In recent years, the media and through PLC DCS (DistributedControlSystem, distributed control system) who will have more vitality and the PLC will be IPC (IndustrialPC, industrial PC), embedded controllers, FCS (FieldbusControlSystem, Fieldbus Control System) to replace discussion. With the computer technology and control technology continues to evolve, PLC and DCS are constantly absorbing the advantages of each other, so in some high-end PLC applications DCS PLC functions and features closer. However, I believe, DCS with DCS traditional applications, PLC have the traditional PLC applications, both of whom in the next 5 years who will not be replaced, but the advantages of mutual absorption of each other, gradually moving toward integration in the end. The developed over time, DCS and PLC functionality closer to high end, what their name does not matter, the traditional vendors may call DCS DCS, PLC manufacturers may call it the traditional PLC, may also be called FCS, PAC (ProgrammableAutomationController, programmable automation controller) or Other Name. Either PLC or DCS, the mainstream products on the market using field bus technology, although they are not in the strict sense of the FCS, but it is also to some extent that they are the FCS, in fact there are many companies that do . Because FCS with DCS, PLC's relationship is not the focus of this discussion, in this little narrative. I am a professional writer from China Manufacturers, which contains a great deal of information about air compressor hose fittings , 1 4 brass fittings, welcome to visit!
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