Entering the 21st century, programmable logic controllers still maintain a strong momentum of development and continue to expand their application fields, such as configuring flexible manufacturing systems (FMS) and computer integrated manufacturing systems (CIMS) for users. At present, programmable logic controllers are mainly expanded in two directions: one is the integrated control system, which has broken through the original concept of programmable logic controllers, closely combining factory production process control with information management systems, and even upward The technical foundation is prepared for MES and ERP system. This development trend will make the difficult ERP system have a solid technical foundation, which will bring about a revolution in industrial control and realize an electronic information factory in the true sense; The second is the emergence of micro-programmable controllers, the size of which is the size of a palm, the functions can cover the control functions of a single device and the entire workshop, and have networking functions. This miniaturized programmable controller enables the control system to extend its reach. to every corner of the factory. With the acceleration of the process of world economic integration, developed countries have paid more attention to the protection of the intellectual property rights of programmable logic controllers at the same time as technology development, and large international programmable logic controller manufacturers have joined the programmable logic controller The International Organization for Standardization, they use many technical standards to establish technical protection barriers that are in their economic interests.Development of Programmable Logic Controller in my country
The development of programmable logic controllers in China is different from the development in the international Introduce application, digestive transplantation, joint venture production to wide application. It can be roughly divided into the following three stages:
The primary understanding stage of programmable logic controllers (late 1970s to early 1980s)
The development of programmable logic controllers in the world first aroused great interest in the domestic engineering and technical circles. Therefore, my country’s understanding of programmable logic controllers began with the introduction of complete sets of equipment in the late 1970s and early 1980s. At that time, Shanghai Baosteel has introduced more than 200 programmable controllers of more than a dozen models in a number of projects in the first phase of the project. These programmable controllers are used in the entire steel smelting and processing production lines from raw material docks to blast furnaces, steel rolling, and steel pipes, replacing traditional relay logic systems, and partially replacing analog control and small DDC systems. Following the Baosteel Phase I project, most of the equipment and production lines introduced by many domestic manufacturers are equipped with programmable logic controllers, which are used in various fields such as power stations, petrochemicals, automobile manufacturing, ports and wharfs. It was during the introduction of complete sets of equipment that we opened our eyes to understand the programmable logic controller, which also promoted the development of programmable logic controllers in our country.
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