FOXBORO AD908JQ

Description

FOXBORO AD908JQ

The first PLC recognized in the world was developed by American Digital Equipment Company (DEC) in 1969. Limited by the conditions of components and computer development at that time, the early PLC was mainly composed of discrete components and small and medium-sized integrated circuits, which could complete simple logic control, timing and counting functions. In the early 1970s, microprocessors appeared. People soon introduced it into the programmable controller, which added the functions of calculation, data transmission and processing to the PLC, and completed the industrial control device with real computer characteristics. In order to facilitate the use of engineering technicians familiar with the relay and contactor system, the programmable controller uses ladder diagram similar to the relay circuit diagram as the main programming language, and names the computer storage elements involved in the calculation and processing with the relay. At this time, PLC is the product of the combination of microcomputer technology and conventional control concept of relay.

In the middle and late 1970s, programmable controllers entered the stage of practical development, and computer technology has been fully introduced into programmable controllers, making a leap in their functions. Its position in modern industry has been established by its higher operation speed, ultra-small size, more reliable industrial anti-interference design, analog calculation, PID function and high performance-price ratio. In the early 1980s, programmable controllers have been widely used in advanced industrial countries. The development of programmable controllers in this period is characterized by large-scale, high-speed, high-performance and product serialization. Another characteristic of this stage is that the number of countries producing programmable controllers in the world is increasing and the output is increasing. This marks that the programmable controller has entered a mature stage.

At the end of the 20th century, the development of programmable controller is more suitable for the needs of modern industry. In terms of control scale, this period saw the development of mainframes and minicomputers; In terms of control ability, a variety of special functional units have been born, which are used in various control situations such as pressure, temperature, speed, displacement, etc; In terms of the matching ability of the product, various human-machine interface units and communication units have been produced, which makes it easier to match industrial control equipment with programmable controllers. At present, the application of PLC in the fields of machinery manufacturing, petrochemical industry, metallurgy and steel, automobile, light industry and so on has been greatly developed.

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