1控制技术的发展历程上世纪80年代前的电梯控制都以“继电器+驱动”为主导,但由于其系统异常复杂、难以掌握,并且故障率高,所以随着集成电路的高速发展,已日趋畏缩、逐渐退出了控制的主市场。“PLC+驱动”在国外一般很少采用,但因为其简单可靠、成本低廉,国内仍被大多数中小企业所喜爱,其缺点是保密性 1 control technology development process Before the 1980s elevator control are dominated by “Relay + Drive ”, but because of its system is extremely complex, difficult to grasp, and the failure rate is high, so with the rapid development of integrated circuits, Has been increasingly shrinking, and gradually withdraw from the control of the main market. “PLC + driver ” is seldom used in foreign countries, but because of its simple and reliable, low cost, the domestic is still loved by most SMEs, the disadvantage of confidentiality