With the deepening of my country’s reform and opening up, foreign manufacturers are optimistic about China’s market, establishing their offices in China, and even setting up their Asia-Pacific headquarters in China. Domestic enterprises have introduced foreign technologies one after another, thus promoting the establishment of a number of technology-introducing enterprises and joint ventures, and driving the technological development of my country’s programmable logic controller industry. The good news is that since the early 1990s, due to the continuous deepening of the application of programmable logic controllers, there has been a climax of independent research and development of programmable logic controllers in China. Although most of them are small programmable logic controllers, the batches are not large. However, its function, quality and reliability have been significantly improved. Representative products such as Nanjing Jiahua’s JH200 have 12 to 120 I/O points, with high-speed counter and analog functions; Hangzhou Xinjian’s D20P, its I/O O is 12/8 points, and the I/O of D100 can be expanded from 40 points to 120 points; Lanzhou Quanzhi’s RD100 and RD200, the former I/O is 9/4 points, 2 points are analog input, the latter I/O is From 20 to 40 o’clock, the extended functions include encoder speed measurement, thermocouple temperature measurement and analog I/O, 32 RD200s can be networked and real-time communication with PC. At the same time, medium and large-scale programmable logic controllers have also begun to appear in China. The STI2000 of the Shanghai Shipping Institute of the Ministry of Communications has 256 I/O points, and the I/O points can reach 4096 points when multiple units are networked; The Hollias-PLC programmable controller developed and produced by the company, among which the typical products are digital I/O up to 1024 points, analog I/O up to 256 points, built-in TCP/IP communication interface, easy access to the management network, Equipped with PROFIBUS-DP field bus master station, slave station and remote I/O, and launched InterControl G3 small programmable controller system with partners. In the case of strong foreign products, these products have the ability to compete with similar foreign products, which fully shows that the development of domestic programmable controllers has entered a new stage.
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