The function of PLC classification and application scenario - programmable logic

Automation has been applied to industrial multiple scene, with the high-speed development of computer in the 21st century, the global industrial level and greatly enhance, mature application of PLC is also an important symbol of industrial automation. Market more and more high to the requirement of industrial automation, understand PLC function classification and application of the scene, help beginners learn PLC and employment direction. A, the switch quantity logic control

switch logic control is the basic, PLC is an application scenario, the first is the most widely in all scenarios. Replaced the previous relay control circuit, so as to realize sequence control logic; Can be used for the control of single equipment, factory assembly line can also be used to group of machine control and automation.

the switch quantity logic control, applications such as: combination machine tools, grinding machine, packaging production line, assembly line, etc.

2, analog control

in the process of industrial production, there are a lot of continuous changing, such as temperature, pressure, flow, level and speed, etc. In order to make the PLC to deal with these analog, must achieve between analog and digital A/D and D/A conversion. Now PLC manufacturers usually form A complete set of production of A/D and D/A conversion module, PLC for analog control. Three, motion control,

PLC ontology dedicated motion control module, driving a stepper motor or servo motor do linear motion or circular motion. Almost all the main PLC manufacturers at home and abroad has the function of motion control.

motion control, applications such as: machinery, machine tools, elevators, etc. Four, process control,

as industrial control computer, PLC can prepare the all kinds of control algorithm procedures, to the analog quantities such as temperature, pressure, flow rate to complete the closed-loop control. The PID adjustment in the closed loop control system is to use more adjustment methods, in large and medium-sized PLC usually have PID module, now many small PLC also equipped with the function of the module.

dryer system PLC control chart, applications such as: metallurgy, chemical industry, heat treatment, boiler control and so on. Five, data processing,

now PLC can complete data collection, analysis and processing, such as mathematics, data transmission, data conversion, sorting, look-up table and bit operation, etc. And these data can be compared with reference values stored in the memory is to, thus to complete certain control operation. Data processing used in the control of large system. Applications such as: flexible papermaking, textile, food industry, such as some large control system. Six, communications and networking

with the development of industrial factory automation network, each PLC manufacturers, attaches great importance to PLC communications function, have launched their own characteristics of the network system. Now the production of PLC is equipped with communication interface, communication between the PLC and PLC controller, PLC communication more convenient with the third party equipment. Above these points emphatically from qualitative sense. If for the amount, the PLC controller have greatly small, so its control is also but can small. Small to control only one device, even some parts, a site; Too big to control multiple devices, and even the whole plant production line.

in fact, the PLC has been widely used in various fields of industrial production, such as steel, chemical industry, electric power, building materials, machinery manufacturing, automobile, textile, transportation, environmental protection and cultural entertainment, and other industries, both production and management, inspection, you can see the shadow of the PLC controller, which is characteristic of the PLC to improve their own.

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