The current level of industrial automation in PLC control systems has become an important indicator of the modernization level of various industries. At the same time, the development of control theory has also gone through three stages: classical control theory, modern control theory, and intelligent control theory. A typical example of intelligent control is a fuzzy fully automatic washing machine, etc. Automatic control systems can be divided into open-loop control systems and closed-loop control systems. A control system includes controllers, sensors, transmitters (related products of transmitters), actuators, and input output interfaces.
The output of the controller is added to the controlled system through the output interface and executing mechanism; the controlled quantity of the control system is sent to the controller through the input interface through sensors and transmitters. Different control systems have different sensors, transmitters, and actuators. For example, a pressure control system requires the use of pressure sensors. The sensor of the electric heating control system is a temperature sensor. At present, there are many PID control and its controllers or intelligent PID controllers (instruments), and the products have been widely applied in engineering practice.
There are various PID controller products, and major companies have developed intelligent regulators with PID parameter self-tuning function. The automatic adjustment of PID controller parameters is achieved through intelligent adjustment or self-tuning, adaptive algorithms. There are pressure, temperature, flow, and liquid level controllers that utilize PID control, programmable controllers (PLCs) that can achieve PID control functions, and PC systems that can achieve PID control, among others. Programmable Logic Controller (PLC) utilizes its closed-loop control module to achieve PID control, while Programmable Logic Controller (PLC) can be directly connected to ControlNet, such as Rockwell’s PLC-5. There are also controllers that can implement PID control functions, such as Rockwell’s Logix product series, which can be directly connected to ControlNet and use the network to achieve its remote control function.
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