"西门子电梯四层PLC控制系统研究及应用"

Abstract: With the rapid development of science and technology in recent years, China's elevator production technology has made great progress. Some elevator factories are constantly improving designs and modifying processes to produce updated models of elevators. Elevators are mainly divided into mechanical systems and control systems. With the development of automatic control theory and microelectronics technology, the propulsion method and control means of elevators have undergone significant changes, and AC variable speed drive is currently the main development direction of elevator propulsion. There are currently three main control systems for elevator control: relay control system (mostly installed in early elevators), PLC control system, and microcomputer control system. The relay control system, due to its high failure rate, poor reliability, inflexible control methods, and high power consumption, has gradually been phased out. The microcomputer control system, although strong in intelligent control, has drawbacks such as poor disturbance rejection, complex system design, and difficulty for maintenance personnel to master its repair technology. On the other hand, the PLC control system, with its high reliability, ease of use and maintenance, strong anti-interference, and shorter design and debugging cycles, has become the most widely used control method in elevator control systems. It is also widely used in the technical transformation of traditional relay control systems. Keywords: plc, elevator, control system, elevator system operation.