Programmable controller technology currently eight development trend

Programmable controller was born shortly shows its important position in industrial control, such as Japan, Germany, France and other countries have developed into their respective PLC controller. PLC technology with the development of computer and microelectronics technology and rapid development, from the original one for 8-bit machine development. As the microprocessor CPU and miniature computer technology in the application of PLC, PLC has formed the modern sense. PLC products have now use the 16-bit and 32-bit high-performance processor, and implements the multiprocessor multi-channel processing, lead to further the application of PLC communication technology. Nowadays, programmable controller technology has more mature. At present, there are more than 200 manufacturers in the world, programmable controller products are well-known manufacturers with Germany's Siemens, the United States Rockwell ( AB) , general motors ( GE) , Japan's mitsubishi, omron, France schneider, etc. The general development trendency of the programmable controller is to high integration, small volume, large capacity, high speed, easy to use and develop in the direction of high performance. Specific performance in the following respects: ( 1) To develop in the direction of miniaturization, specialty and low cost in the early 1980 s, small PLC on price is higher than that of small system use relay control device. With the development of microelectronics technology, the new device drastically improve function and lower the price, make the PLC has compact structure, function, increasing the original large and medium-sized PLC functions that it transplanted into small PLC, such as analog processing, data communication and the function of the complex instructions, etc. , but prices are falling, a true alternative to relay control system products. ( 2) To the large capacity, high speed direction large-scale PLC controller using multiple microprocessor system, some use 32-bit microprocessor, multitasking operating at the same time, improve the processing speed, especially to strengthen the process control and data processing function. In addition, the storage capacity is greatly increased. ( 3) With close links to the computer, from the function of PLC can not only complete the logic operation, and the complex operation function of the computer also has been further use in the PLC, structurally, computer hardware and technology are increasingly applied to PLC; From the point of view of language, is no longer a simple use of PLC ladder diagram language, and can be used a variety of languages, such as a computer assembly language statement list, and even can be directly by computer programming in a high-level language; In the aspect of communications, PLC controller and computer and information transmission can be directly connected. ( 4) The diversification of development diversification development of programmable controller is embodied in three aspects: product type, programming languages and application field. ( 5) The expansion of the modular PLC module has been developing rapidly. Explicit, specialty of complex functions are done by specialized modules. Host only through communication equipment command to the module and the test condition, which makes the PLC system function further strengthened, further simplify control system design. ( 6) Network and communication ability between computer and PLC and PLC networking and communication ability, the use of industrial network can effectively save resources, reduce costs, improve system reliability and flexibility, the application of the network has a tendency to generalization. ( 7) Diversification and standardization production PLC products each manufacturer are in great efforts to develop their own new products, in order to occupy a larger share of the market. So products to develop in the direction of diversification, Europe, America, Japan appeared a variety of genres. At the same time, in order to promote the process of technology standardization. Some international organizations, such as the international electrotechnical commission ( IEC) Continually set new standards for the development of PLC, such as the various types of products for generalized or definition, or set a direction for the future development of the PLC or framework. ( 8) Software industry has developed rapidly with the development of the programmable controller hardware technology, software industry developing very rapidly, it makes the system more simple, greatly facilitate the development of PLC system and operation personnel.
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