Introduction to PLC and industry application popularize knowledge

a. PLC overview of 1. Definition of PLC ( 可编程逻辑控制器) : programmable logic controller. Essence is a specialized in industrial control computer, its hardware structure is basically the same with a microcomputer, basic components shown in the figure below: 2. Working principle of the PLC boot after the operation, its working process is generally divided into three stages, namely the input sampling, refresh the user program execution and output. Complete the above three stages as a scan cycle. During the whole operation, scanning speed of PLC CPU in a repeat the above three phases, as shown in the figure below: 2. PLC classification 1. Monolithic integrated PLC PLC is will power, the CPU and input/output is placed in a box body, usually referred to as the basic unit, as shown in the figure below. Integral PLC general can also be equipped with special function units, such as analog unit, position control unit, etc. , to extend its function. This kind of PLC including the characteristics of compact structure, small volume, low price. This kind of integral structure commonly used small PLC. 2. Modular PLC modular PLC controller PLC respectively each component to make a number of separate modules, such as CPU module, I/O module, power supply module ( Some contain in the CPU module) Etc. , the modules in a frame or substrate socket, as shown in the figure below. The modular PLC is characterized by flexible configuration, can be selected according to need different size of system, and convenient assembly, easy extension, and maintenance. Large and medium-sized PLC adopts modular structure in general. 3. International common PLC PLC main monopoly by the United States, Europe and Japan, including PLC technology in the United States and Europe is in isolated cases, independent research and development, so the two PLC has obvious difference. And PLC technology in Japan is introduced by the United States, to the United States of the PLC has the certain inheritance. The United States and Europe is famous for its large and medium-sized PLC, while Japan is famous for its small PLC. The following is the world's leading one of the PLC. Four. PLC controller is the function and application of PLC in the integrated relay contactor control and computer control above many of the advantages of design and development, it is in metallurgy, energy, chemical industry, transportation, electricity and other fields has been widely used. 1. Switch logic control and the PLC to replace the traditional relay circuit, realize logic control and sequence control, it can be used for 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 some, such as temperature, pressure, flow, level and speed of continuous variation ( The analog) 。 A/D module can transmit analog quantities such as temperature, pressure, flow, speed conversion into digital quantity, and then by the PLC in the microprocessor for processing, then to control; Or converted into analog by D/A module, and then control the controlled object, so that it can realize PLC controller control of the analog. Analog control in metallurgy, chemical industry, heat treatment, boiler control and so on occasion has very wide application. Note: PLC configuration has the A/D and D/A conversion module ( A refers to analog signals, D refers to the digital signals) 3. Data acquisition 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. Data processing is generally used in a large control system, such as unmanned control of flexible manufacturing systems; 4. Timing and counting control PLC has strong timing and counting functions, it can provide users with dozens or even hundreds or thousands of timers and counters. The timing of the time and count value can be set arbitrary when writing the user program, by the user can also by the operating personnel at the scene of the industry through the programmer to set, thus realize the control of timing and counting. If users need to count of high frequency signal, can choose high speed counting module. Five. PLC and bayi horse BMD100 1 industrial-grade DTU wireless connection. Application of illustration to hk industrial-class wireless DTU (ma BMD100 - 一) As an example, the PLC through through RS232 and RS485 interface to connect with BMD, the front-end acquisition of data to the server ( TLINK platform, for example) , the following is the application diagram: 2. BMD100 - A DTU with PLC through RS232 or RS485 connection diagram:
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