Study On Simulation Of The Control System Of Elevator And Elevator Model Through Configuration Software

Programmable Logic Controller (PLC) is the largest consumption of computerized industrial controlling device. The courses on PLC are now offered in all technological universities. PLC experimental classes need controlled plants made up of hardware; the elevator, for example, is a common and typical one. Elevator model, with complex structure and expensive price, is difficult to equip largely, and has shortcomings, e.g. great size, easy to damage and difficult to maintain.Simulating the controlled plant of PLC by a computer can enrich the content of PLC experimental class and enhance the teaching effect with a lower cost and diversified process.Configuration software is a computer monitoring software for control system, which is easy to generate the graphic objects and communicate with PLC. It is the best software to simulate the controlled plant of PLC. Using "KingView", the configuration software, the author has simulated an elevator in following two ways:1. The simulation of five-storey elevator has been made with the configuration software. With the controlling programs written for PLC, the exchange of information between the computer and the PLC has been implemented through the serial communication, and then, the "virtual" elevator is controlled by the PLC. The programs written by command languages in configuration software make the car and the door of the "virtual" elevator carry out corresponding moves, show various state information for PLC through indicating lamp and storey display on the configuration software screen. To make a few alterations with the configuration software screen and the programs written by command languages can easily increase the stories and perform the simulation of double elevators or multi-elevators. This virtual elevator can also be used for testing the PLC control programs in an actual elevator.2. The pure software simulation of five-storey elevator control system has been made with the configuration software. This simulation uses the command languages of configuration software, with which the elevator itself is also simulated, to control the virtual elevator rather than user's PLC programs. Such simulation control system can help students to deeply understand and use configuration software; it has great applications value in the teaching.To enable students to have a stronger sense of reality with elevator, two elevator models driven by frequency inverter are developed, using the incremental rotary encoder to detect the speed of the motor, and the PID controller embedded in the frequency inverter to achieve...