Abstract: With the rapid development of microelectronics and computer technology, PLC (Programmable Logic Controller) has been widely used in the field of industrial control. PLC is an electronic control device based on digital computer technology and designed for use in industrial environments. It uses programmable memory to store user instructions and completes a series of logic, sequence, timing, counting, calculation and other functions through digital or analog input/output to control various types of mechatronic equipment and production processes. This paper introduces a control system of a five-story elevator written using a programmable controller to test the operation of the elevator PLC control system. Practice has proved that the combination of PLC programmable controller and MCGS configuration software is conducive to the design and detection of PLC control systems and has good application value. Elevators are a vertical transportation tool that has developed with the construction of high-rise buildings. Multi-story factories and warehouses need freight elevators; high-rise residential buildings need residential elevators; department stores and hotels need passenger elevators, escalators, etc. In modern society, elevators have become an indispensable means of transportation for humans, just like cars and ships. According to statistics, the number of people taking elevators in the United States every day is more than the number of people taking other means of transportation. In today\'s world, the use of elevators has become one of the symbols of the degree of modernization. Tracing the history of elevators, a lifting device, it is said that it originated in ancient Greece in 236 BC. At that time, a man named Archimedes designed a human-driven drum winch. In 1858, passenger elevators powered by steam engines appeared in the United States, followed by hydraulic elevators in the United Kingdom. In 1889, the Otis Elevator Company in the United States first used electric motors as elevator power, which led to the emergence of real elevators and made elevators more practical. In 1900, the first escalator appeared. In 1949, group-controlled elevators appeared, and the first batch of 4 to 6 group-controlled elevators were used in the United Nations Building in New York. In 1955, small computers (vacuum tubes) controlled elevators appeared. In 1962, ultra-high-speed elevators with a speed of 8 meters per second appeared in the United States. In 1963, some advanced industrial countries only became contactless semiconductor logic controlled elevators. In 1967, thyristors were used in elevators, which made the elevator\'s traction system more compact and improved its performance. Integrated circuits were used in elevators in 1971. CNC elevators appeared the following year. Microprocessors began to be used in elevators in 1976, ushering in a new period of development for the electrical control of elevators. 1 Introduction to Elevators 1.1 Basic Classification of Elevators 1.1.1 Classification by Purpose ⑴ Passenger Elevator: An elevator designed for transporting passengers. It is mainly used in places with large passenger flow, such as hotels, restaurants, office buildings, and large stores. In order to improve transportation efficiency, this type of elevator has a relatively fast running speed and a relatively high degree of automation. The size and structure of the car are mostly wider than the depth, so that passengers can enter and exit smoothly. It also has complete safety facilities and beautiful decoration.
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