The application of PLC classification introduced the five functions of PLC

At home and abroad at present, the PLC controller has been widely used in steel, petroleum, chemical, electric power, building materials, machinery manufacturing, automobile, textile, transportation, environmental protection, cultural entertainment and other industries, with the continuous improvement of its performance, application scope continues to expand, the application of PLC can be roughly divided into the following categories. 1) , the switch quantity logic control the PLC's most basic, the most widely application field. PLC to replace the traditional relay logic control system control circuit, realize logic control, sequence control, can be used for both single machine control, also can be used for the fleet of more control and automatic production line control, etc. Such as machine tool electric control, assembly line, the elevator control system of blast furnace, metallurgical system and various production line of control. 2) Can be used in circular motion, motion control, PLC or linear motion control. At present, most of the PLC manufacturers provide drag single shaft of the stepper motor or servo motor or multi-axis position control module, the function can be widely used in all kinds of machinery, such as metal cutting machine tool, metal shaping machine tool, robot, elevators, etc. 3) Process control, process control refers to continuous variation, such as temperature, pressure, flow, velocity of analog closed loop control. PLC adopts corresponding A/D and D/A conversion module and A variety of control algorithm to process the analog program, complete the closed-loop control. PID control is generally be applied closed loop control system of a kind of adjusting method. The process control in metallurgy, chemical industry, heat treatment, boiler control and so on occasion has very wide application. Modern large and medium-sized PLC usually have closed loop PID control module, the function can be done using PID subroutine, and more about using a dedicated PID module to implement. 4) , data processing of PLC with math ( Including matrix operations, functions, operation and logic operation) , data transmission, data conversion, sorting, look-up table, bitwise operations, and other functions, can complete data collection, analysis and processing. The data can be specified via communication interface of intelligent device for processing, or printing them. Set aside. Data processing is generally used in a large control system, such as some large paper making, metallurgy, food industry of control system. 5) PLC, communication and networking communication between PLC and PLC and PC, communication between PLC and other smart devices. PLC controller with other intelligent control equipment, can constitute a 'centralized management, decentralized control' of the distributed control system, and meet the needs of the development of factory automation system. When the difference between the PLC control system and relay control system: (1) of the device is different: the relay control circuit is really many of hardware relay, and trapezoidal plan consists of many so-called 'soft relay'. 2 different contact number: hard relay contact quantity is limited, only commonly used to control the relay contact points 4 ~ 8 right; The ladder diagram of each 'soft relay' for the use of programming touch points have infinite. (3) control method is different: in the relay control circuit, implement some control is solved through hard wiring between various relay. And PLC control is the ladder diagram by software programming. (4) different works: in the relay control circuit, using parallel work; In the ladder diagram of control circuit, serial works.
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