Longfeng Automation Training Center, program-controlled education, Shenzhen Control PLC Training Center, Bafanghui, Fuchuan Engineer College, Ji Cheng Training Network, University of Electronic Science and Technology of China Vocational Skills Training School, Changsha Lake Xiang Vocational and Technical Training College, Cixi Hangzhou Bay Secondary Vocational School, Zhengzhou Zhengding Automation Technology Co., Ltd. ..
Programmable logic controller (PLC) is a digital operation electronic system specially designed for industrial environment applications. It uses programmable memory, which stores instructions for logical operation, sequence control, timing, counting and arithmetic operation, and controls various types of mechanical equipment or production processes through digital or analog input and output. ?
Programmable logic controller (PLC) is a kind of digital operation controller which is automatically controlled by microprocessor. It can load control instructions into memory for storage and execution at any time.
Programmable controller consists of CPU, instruction and data memory, input/output interface, power supply, digital-to-analog conversion and other functional units. The early programmable logic controller only had the function of logic control, so it was named programmable logic controller.
Later, with the continuous development, these simple computer modules already have many functions, including logic control, time sequence control, analog control, multi-computer communication and so on, and their names have also been changed to programmable controllers.
However, due to the conflict between the abbreviation of PC and the abbreviation of personal computer, and the reasons of habit, people often use the name of programmable logic controller and still use the abbreviation of PLC. ?
Industrial programmable logic controller is equivalent to or close to the host of a compact computer, and its advantages in expansibility and reliability make it widely used in various industrial control fields.
There are always a large number of PLC controllers in computer direct control system, centralized distributed control system DCS and field bus control system FCS. There are many manufacturers of PLC, such as Siemens, Schneider, Mitsubishi and Delta. Almost all manufacturers involved in industrial automation will have their own PLC products.