With the continuous development of urban construction, the elevator in today's society has a wide range of applications. Elevator in the building as a complex operation of the vertical transport has been inextricably linked with people's daily life. Nowadays, every developing and developed country are using elevator to rise-in the high stored building. In this book, I therefore wanted to give focus on using programmable logic controller to control the elevator, as PLCs make the easy operation to control complex circuit. Even though the design was limited to four levels, some suggestions are...