Everyone who learns electronics knows that PLC is a very important device and a relatively difficult technology. It is a digital computing operation electronic system specially designed for application in an industrial environment. It is a realization of industrial automation and the Internet of Things. The foundation of control has very broad application prospects in the future.
Application characteristics and development trends of PLC technology in industrial control and Internet of Things
PLC technology originated in the United States. The first application of PLC to General Motors in the United States. In the 1960s, when they adjusted the factory production line, they found that the relay and contactor control systems were difficult to modify, bulky, noisy, inconvenient to maintain, and reliable. Poor sex. Subsequently, the American Digital Equipment Company developed the first programmable controller, and the trial effect was remarkable on the production line of General Motors. After that, PLC technology was carried forward in Japan and Europe, and programmable controllers were successfully developed in Japan and Germany. In 1974, my country also began to study programmable controllers, and they were widely used in various fields.
PLC was the first to replace mechanical switch devices, and then the function of PLC gradually replaced the relay control board. Modern PLC has more functions, and its use extends from single process control to control and monitoring of the entire manufacturing system.
Application of PLC technology in industrial automation, Internet of Things control and other fields
From the current point of view, PLC technology is widely used in various industries such as industrial automation, automotive electronics, transportation, and Internet of Things control. Its role in these fields can be roughly divided into four categories.
1. Used to realize various motion control
The PLC controller is a digital electronic device with a microprocessor. It is a digital logic controller used for automatic control. It can load control instructions into the memory for storage and execution at any time. The programmable controller consists of the internal CPU, instruction and data memory, Input and output units, power modules, digital and analog units are modularized and combined. PLC controllers can be used for circular motion or linear motion control. Today, almost all major PLC controller products have motion control functions, which are used in various machinery, machine tools, robots, elevators and other occasions.
2. Realize industrial process control
As an industrial control computer, PLC controller can compile various control algorithm programs to complete closed-loop control. In industrial process control, PLC mainly performs closed-loop control on temperature, pressure, flow and other analog parameters. Large and medium-sized PLCs have PID modules. PID adjustment is a commonly used adjustment method in general closed-loop control systems. At present, many small PLC controllers also have this functional module.
3. Realize related data processing
Modern PLC controllers have functions such as mathematical operations, data transmission and conversion, and can complete data collection, analysis and processing; these data can be compared with reference values ​​stored in the memory to complete certain control operations, or they can be transmitted using communication functions To other smart devices. In large-scale control systems, such as unmanned flexible manufacturing systems, PLC controllers are one of the core components.
Fourth, PLC communication and the Internet of Things
As the general trend of the industrial Internet of Things, the related technologies of PLC communication and the Internet of Things will become popular in the future. Normal PLC controller communication includes communication between PLC controllers and communication between PLC controllers and other intelligent devices. With the development of industrial automation, each PLC controller manufacturer attaches great importance to the communication function of PLC controllers, and has launched their own network systems. The new PLC controllers all have communication interfaces, which makes the communication very convenient.
Application characteristics and development trends of PLC technology in industrial control and Internet of Things
Three characteristics of future PLC technology
1. Miniaturization and integration are getting higher and higher: With the market's requirements for miniaturization and integration, PLC technology is more integrated into industrial, automotive, communications and other products. The characteristics of PLC products are control and data processing. While satisfying the functions, the technological requirements are also more refined.
2. Intelligent PLC technology: With the development of AI technology, more products are given intelligent functions, and PLC is no exception. For example, the intelligent I/O module of the PLC used in industrial control and the intelligent temperature control module of the automobile, etc., there will be more application scenarios for the intelligent PLC technology in the future.
3. Diversified PLC technology: Including PLC-related programming languages ​​and tools. With the deepening of application scenarios, one or several programming languages ​​cannot realize all functions. Customized PLC products will increase, and PLC modules The technology of transformation will also increase.
Application characteristics and development trends of PLC technology in industrial control and Internet of Things
China's PLC market has huge potential
Nowadays, PLC technology is developing rapidly. According to statistics, there are more than 300 PLC manufacturers and more than 500 PLC products in the world. The United States, Europe, and Japan are the main production areas, with a market share of over 60%. The United States has AB company, General Electric, Modicon; Germany's Siemens, AEG company; France's TE company; Japan's Mitsubishi, Omron, Panasonic, etc. are all well-known PLC suppliers.
In recent years, with the attention of the country and enterprises, my country's PLC industry has maintained rapid growth, and domestic companies with certain influence such as Delta, Inovance, Hexin, Yiwei, Kewei and Lishi etc. have also been born. According to relevant data, the scale of my country's PLC market was 10 billion yuan in 2017, and it is expected to maintain a growth rate of 20% in 2018. Domestic PLC products have very good cost performance and service, which has brought them a good reputation and market.
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