Six of PLC application field analysis is introduced

At home and abroad at present, the PLC has been widely used in steel, petroleum, chemical, electric power, building materials, machinery manufacturing, automobile, textile, transportation, environmental protection, cultural entertainment and other industries, usage can be classified into the following categories. 1 switch logic control and the PLC's most basic, the most widely application field, it replaces the traditional relay circuit, realize logic control, sequence control, can be used in a single device control, also can be used for the fleet of more control and automatic assembly line. Such as injection molding machine, printing machine, stapler machinery, combined machine tool, grinding machine, packaging production line, plating production line, etc. 2 analog control in industrial production process, there are a lot of continuous change, such as temperature, pressure, flow, level and speed are all analog. In order to make the analog programmable controller processing, must implement the analog ( 模拟) And the digital quantity ( Digital） Between A/D conversion and D/A conversion. PLC manufacturers supporting production of A/D and D/A conversion module, the programmable controller for analog control. 3 motion control of PLC controller can be used in circular motion and linear motion control. From control mechanism configuration, early applied directly to switch the I/O module connection position sensors and actuators, now in general use special motion control module. Such as driving a stepper motor or servo motor of uniaxial or multi-axis position control module. The world's major products almost all have motion control function of PLC manufacturers, widely used in all kinds of machinery, machine tools, robots, elevators, etc. 4 process control refers to the process control of analog quantities such as temperature, pressure, flow rate of the closed loop control. As industrial control computer, PLC can prepare the all kinds of control algorithm procedures, complete the closed-loop control. PID regulation is be applied generally closed-loop control system of regulating methods. Large and medium-sized PLC has PID module, at present many small PLC also has the function module. PID processing is generally run special PID subroutine. The process control in metallurgy, chemical industry, heat treatment, boiler control and so on occasion has very wide application. 5 data processing modern 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 compared with reference values stored in the memory, accomplish a certain number of control operation, also can send to other intelligent device, the use of communication function or printing them tabulation. Data processing is generally used in a large control system, such as unmanned control of flexible manufacturing systems; Can also be used to process control system, such as paper making, metallurgy, food industry, some of the large control system. 6 communication and network communication between the PLC communication with PLC and the communication between PLC and other smart devices. With the development of computer control, factory automation network is growing fast, the PLC manufacturers have attached great importance to PLC controller communications functions, have launched their own network systems. The newly production PLC has a communication interface, communication is very convenient.
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