What is a PLC? The definition of the programmable controller

Programmable Controller, English said Programmable Controller, hereinafter referred to as PC. But because the PC easy and personal computer ( 个人电脑) Confusion, so people still habitually use PLC as the abbreviation of programmable controller. It is a microprocessor as the core of digital computing operation of electronic systems, specially designed for application in industry site, 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 the digital or analog input and output interface, control various types of machinery or production process. PLC 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, and take care of the electrical operation and maintenance personnel skills and habits, especially the programming of PLC controller, do not need special knowledge of computer programming language, but using a set of simple instructions to relay trapezoidal graph based form, the user program compiled image, intuitive, convenient and easy to learn; Debugging and error are also very convenient. The user ends up after the PLC, just according to specification, to do a small amount of connection and simple user programming work, can be conveniently flexible applying PLC to the production practice. Programmable controller has been developing, so is not yet in its final definition. International electrotechnical society ( IEC） Once successively in 1982. 11. 1985. 1 and 1987. 2 released the first draft standard programmable controller, two, three. In the third draft of PLC made the following definition: a programmable controller is a kind of digital computing operations electronic systems, specially designed for application in industrial environment. It USES a programmable memory, used in its internal storage to perform logical operations, sequential control, timing, counting and arithmetic operations such as instruction, and through digital, analog input and output, control various types of machinery or production process. Programmable controller and related peripheral equipment, should press easily and industrial control system to form a whole, to expand its function on the principle of design. Definition highlights the PLC controller is: 1 digital computing operations electronic systems - — 2 is also a kind of computer designed for application in industrial environment and 3 user-oriented instructions - — Programming convenient 4 logic operation, sequence control, timing, calculation and arithmetic operations 5 digital or analog input/output control 6 easy control system be installed with the 7 is easy to expand
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