Brief introduction (programmable logic controller PLC 可编程序逻辑控制器

Programmable controller is 60 s first appeared in the United States, was called a PLC (programmable logic controller 可编程逻辑控制器) , the purpose is to replace relay, to perform logic, timing, counting and sequence control function. PLC is the basic design idea of the advantages of the computer function is perfect, flexible, general and relay control system of simple, easy to operate, combine the advantages of cheap, the hardware of the controller is a standard, generic. According to the actual application objects, the control content into software into the controller of the user program memory. Controller and the controlled object connection is convenient. With semiconductor technology, especially the development of the microprocessor and microcomputer technology, by the mid 70 s, the PLC controller has been widely used microprocessor as the CPU, input and output module and peripheral circuit are adopted, mass, and even in very large scale integrated circuit, then the PLC is no longer a logic function, also have the function of data processing, PID control and data communication. Programmable controller is a digital computing operation of electronic systems, specially designed for application in industrial environment. It USES a programmable memory, used in its internal storage to perform the logic operation, sequence control, timing, counting and arithmetic operations such as instruction, and through digital and analog input and output, control various types of machinery or production process. PLC controller is the computer technology and the combination of the traditional relay contact control technology, it overcomes the relay contact control system of mechanical contact wiring complex, high reliability, low power consumption, the poor generality and flexibility, make full use of the advantages of the microprocessor. Programmable controller for users, it is a non-contact equipment, change procedure can change the production process, so can choose programmable controller in the preliminary design stage, to determine the process on the stage of implementation. On the other hand, from the point of view in the production of programmable controller manufacturers, in the manufacturing stage does not need to specially designed controller according to the user's orders, is suitable for mass production. Due to these characteristics, the advent of programmable controller soon was welcomed by the industry control, and to get rapid development. At present, the programmable controller has become a powerful tool for factory automation, has been widely used.
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