Elevators are essential vertical platforms for high-rise buildings (such as high-rise buildings, shops, houses, multi-story buildings and warehouses). With the development of the society, the scale of the building is getting larger and larger, more and more floors put forward higher requirements on the speed regulation of the elevator and the static and dynamic characteristics of the speed regulation range. Elevator is a complex system integrated with mechatronics. It involves not only mechanical transmission, electrical control and civil engineering, but also reliability, comfort and aesthetics. For modern elevators, it should be highly safe. In fact, many safety measures have been taken for elevators. When designing the elevator, the higher safety factor and safety factor should be applied to the mechanical and electrical components. However, only the manufacture, installation and commissioning of the elevator, after-sales service and maintenance can ensure the highest quality of the elevator. In foreign countries, the regulations have implemented the integration of elevator manufacturing, installation and maintenance, and established the maintenance unit of professional installation team recognized by many manufacturing companies, and carried out standardization, installation and debugging, regular maintenance and inspection tests. It ensures the reliable operation and safety of the elevator [1]. Therefore, it can be said that taking the elevator is safer.
An American insurance company carefully investigated and scientifically calculated the safety of elevators. The conclusion is that taking the elevator is five times safer than taking the stairs. According to statistics, there are about 8 billion people in other transportation vehicles in the United States, and 5.4 billion people use elevators. At present, the elevator operation logic control system composed of programmable logic controller (PLC) and microcomputer is developing rapidly. PLC controlled elevator has the advantages of high reliability, convenient maintenance and short development cycle. Elevator is more reliable and has more flexibility to complete more complex control tasks, which has become the development direction of elevator control [2].