Design Of Virtual Elevator Based On Siemens S7-300plc

With the rapid process of urban modernization, elevator as a safe, efficient, rapid vertical transport equipment has been inextricably linked to people's everyday lives. With intelligent control technology, elevator control technology is developed from the relay control to the PLC control and microcomputer control.Elevator control has become a typical example in building intelligent control and process control system. Because of PLC technology, including high reliability, strong anti-interference ability, powerful,scalable and low cost has been widely used. With the increasing demand for personnel who master PLC technology, PLC courses has become a type of course in many colleges and vocational institutions.Therefore, it is imperative to design a visible PLC virtual elevator teaching model.Operational features for elevators, the virtual elevator system is designed according to the object-oriented program design method and sequence method. Design includes elevator control technology, program design of PLC elevator control, simulation of virtual elevator program, monitoring for virtual elevator operation. Design uses powerful, advanced Siemens S7-300PLC,Siemens S7-PLCSIM simulation software and WinCC flexible monitoring software to achieve soft-PLC control,simulation and monitoring.Consider PLC control system as simulative object, Virtual elevator system is designed. Abased on the analysis of the operation principle of elevator and requirements of control,we should assign port configuration to PLC input/output (I/O), design LAD (Ladder Diagram) control program. There are many elevator control modules need to simulate,such as the module of door movement control,the module of register and cancel the instructions from the cabin and station hall, the module of choose station and direction, and so on.Virtual elevator system design replace the traditional relay control system. This article proposes a novel control method that convenient for teachers to teach, easy to student programming and debugging. The virtual elevator system compared to the physical model,it gives full play of Siemens PLC and configuration software for medium-sized power, with strong flexibility, operability, versatility. Teachers and students can develop various configuration simulating control system in need. From the computer simulation, Students can visually experience the effects of their program on production equipments at the scenes and modify their programmers to achieve the goal of PLC Programming according to the configuration simulating results, and improve teaching efficiency and level of training.