PLC function classification and application scenarios

by:V&T Technologies     2020-01-25
Automation has been applied to many industrial scenes. With the rapid development of computers in the 21st century, the global industrial level has also been greatly improved. The mature application of PLC is also an important symbol of industrial automation. The market has higher and higher requirements for industrial automation. Understanding the functional classification and application scenarios of PLC is helpful for beginners to learn PLC and their employment direction. I. Switching value logic control switching value logic control is the basis of PLC and the first application scenario, which is the most extensive in all application scenarios. It replaces the previous relay circuit control, thus realizing logic sequence control; It can be used for the control of single-machine equipment, group control and automatic factory assembly line. Switching value logic control, applications such as: modular machine tools, grinding machines, packaging production line assembly line, etc. Second, analog quantity control, in the process of industrial production, there are many continuously changing quantities, such as temperature, pressure, flow rate, liquid level and speed, etc. In order for PLC to process these Analog quantities, it is necessary to realize the conversion of A/D and D/A between Analog quantities and digital quantities. Nowadays, PLC manufacturers usually produce matching A/D and D/A conversion modules to make PLC convenient for analog control. Third, the motion control PLC body dedicated motion control module can drive stepping motor or servo motor to do linear motion or circular motion. Almost all the products of major PLC manufacturers at home and abroad have the function of motion control. Motion Control, applications such as: machinery, machine tools, elevators, etc. Four, process control, as an industrial control computer, PLC can compile various control algorithm programs to complete closed-loop control of Analog quantities such as temperature, pressure and flow. PID regulation is widely used in closed-loop control systems. PID modules are generally available on large and medium-sized PLC. Now many small PLC are also equipped with modules with this function. Five, data processing, the current PLC can complete data collection, analysis and processing, such as mathematical operations, data transmission, data conversion, sorting, table lookup and bit operations. These data can be compared with the reference values stored in the memory to complete certain control operations. Data processing is often used in large control systems. Applications such as flexible paper making, textile, food industry and other large-scale control systems. 6. Communication and networking. With the development of automatic networks in industrial plants, various PLC manufacturers attach great importance to the communication function of PLC and have launched their own network systems. Nowadays, PLC produced is equipped with communication interface, which makes communication between PLC and PLC and communication between PLC and third-party equipment more convenient. The above points focus on quality. In terms of quantity, PLC is large or small, so its control range can be large or small. Small to only control a certain device, even a certain component, a certain site; Large enough to control multiple devices, production lines and even the entire factory. In fact, PLC has been widely used in various fields of industrial production, such as steel, chemical industry, electric power, building materials, machinery manufacturing, automobiles, textiles, transportation, environmental protection, culture and entertainment, etc, whether it is production, manufacturing or management inspection, you can see the shadow of PLC, which is determined by PLC's continuous improvement of its own characteristics. TAG
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