Programmable logic controller is a digital operation operating electronic system, specially designed for theindustrydesigned for application in the environment.It uses a programmable memory, which stores instructions for performing logic operations, sequence control, timing, counting and arithmetic operations, and controls various types of digital or analog input and output.mechanicalequipment or production process.
The birth of PLC controller can be traced back to the 1960s. When General Motors was adjusting the factory production line, it found that the relay and contactor control system were difficult to modify, bulky, noisy, inconvenient to maintain and had poor reliability, so it proposed the famous “General Ten” bidding indicators.
In 1969, the American Digital Equipment Corporation developed the first programmable controller (PDP-14), and after trial on the production line of General Motors, the effect was remarkable; in 1971, Japan developed the first programmable controller (DCS). -8); In 1973, Germany developed the first programmable controller; in 1974, my country began to develop programmable controllers; in 1977, my country promoted PLC in the field of industrial applications.
It can be said that in the middle and late 1970s, it entered a stage of PLC practical development. The characteristics of higher computing speed, ultra-small size, more reliable industrial anti-jamming design, analog operation, PID function and extremely high cost performance of PLC have established its position in modern industry.
According to incomplete statistics, there are currently about 200 manufacturers of PLC and its network in the world, with more than 400 varieties of PLC products. Whether it is in the output or sales volume of industrial control devices, PLC products have long ranked first, and the market demand for PLC is still rising. Taking the market situation since the 1990s as an example, the global PLC sales have reached 10 billion US dollars, and the annual growth rate has been maintained at about 15%.
In contrast, the research and application of PLC in my country began in the mid-1970s. In 1974, the PLC was developed, but due to the production level and device, it was not popularized and applied; in 1977, a programmable controller with a microprocessor MC14500 as the core was successfully developed, and it began to be applied to industrial production control.
In the late 1970s and early 1980s, due to the import of foreign complete sets of special equipment, my country also introduced a lot of foreign PLC products, and in the subsequent transformation of traditional equipment and the design of new equipment, the application of PLC has been increased year by year. good effect.
While actively introducing foreign PLC production lines, many scientific research units and high-tech enterprises are learning and absorbing experience, secondary development of foreign PLC products, and competing to develop, develop and produce some of our own PLC products.such as Beijing KaidianautomationK3 series PLC independently developed and designed by Technology Co., Ltd., and XC series PLC designed and produced by Wuxi Xinjie Technology Electronics Co., Ltd.
After years of development, domestic PLC manufacturers have gradually risen, but the domestic PLC application market is still dominated by foreign products. But fortunately, local enterprises still have great competitive advantages when developing PLC business, such as: demand advantage, product customization advantage, cost advantage, service advantage, response speed advantage, etc. Therefore, how to make good use of these advantages, vigorously develop “Made in China”, and promote domestic PLCs to the world is a problem that the industry needs to consider carefully. It is foreseeable that the prospect of the domestic PLC industry is worth looking forward to.
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