The application range of the programmable controller PLC

At present, the PLC has been widely used at home and abroad, metallurgy, petroleum, chemical industry, building materials, machinery manufacturing, electric power, automobile, light industry, environmental protection and cultural entertainment and so on all walks of life, with the constant improvement of the price performance ratio of PLC, expanding its application field. From the application type, application of PLC can be roughly divided into the following several aspects: 1. Switch logic control using PLC and the basic logic operations, timing, counting and other functions to realize logic control, can replace the traditional relay control, used in single machine control, multiple machines control, automatic line production control, etc. , such as: machine tools, injection molding machine, printing machine, assembly lines, plating lines and control of the elevator. This is the most basic application of PLC, is also the most widely application field of PLC. 2. Most PLC motion control have drag single shaft of the stepper motor or servo motor or multi-axis position control module. This function is widely used in various mechanical equipment, such as for a variety of machine tools, assembly machines, robot motion control, etc. 3. Process control of large and medium-sized PLC has multi-channel analog I/O module and function of PID control, also has some small PLC analog input and output. So the PLC can achieve analog control and PID control function of PLC can constitute a closed loop control, used in process control. This function has been widely used in boiler, reactor, water treatment, brewing, and the closed loop position control and speed control, etc. 4. Data processing of the modern PLC has a mathematical operation, data transmission, transformation, sorting and look-up table, and other functions, for data collection, analysis and processing, and the data transmission through communication interface to other intelligent devices, such as computer numerical control ( CNC） Equipment, processing. 5. PLC communication networking communication including PLC and PLC controller, PLC and upper computer, PLC and other communications between smart devices, PLC system and general computer can convert, directly or through the communication processing unit, communication unit is connected to constitute a network, in order to realize the exchange of information, and can constitute a 'centralized management, decentralized control' multi-stage distributed control system, meet the factory automation ( FA） The needs of the development of system.
The increasing consumption demand in key segments such as programmable control systems, plc controller price and programmable control systems have been driving the sales of and its derivatives worldwide.
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