Design Of Elevator Group Control System Based On Plc.

With the development of economy and the advancement of modernization,high-rise buildings continue to emerge.Elevators have become an indispensable means of transportation in buildings.In some large shopping malls and hospitals,a single elevator can no longer meet people’s needs.In order to meet the needs of passengers,improve transportation Efficiency requires the installation of multiple elevators,so the research on elevator group control systems is very meaningful.This subject designs a set of PLC-based control system based on six ten-floor elevators(six elevators,ten-floor single elevator),to complete the passenger traffic as much as possible within the specified time while minimizing the total running distance of the elevators.This system needs to control 6 elevators.Each elevator has 10 stay floors.Each floor has sensors for upward deceleration,downward deceleration and level stop.These sensors are required to complete the gradual acceleration and deceleration process when the elevator starts and stops.It maintains a constant speed when running between floors.In addition,this design also realizes the initialization function of each elevator and the processing of hedging the top or the bottom of the pier,so that each elevator can reach the designated floor at the initial time as needed.The focus and difficulty of this design is that there are many external command signals to be processed,not only that each elevator has many external sensors,but also that each elevator has dozens of internal and external call buttons,all of these command states Record the current operation status of the elevator and the elevator,and determine the target of the elevator according to a certain control strategy.The realization of the control strategy is to compare the operation status of each elevator,the floor position and the running time.It is difficult to use the commonly used ladder diagram(LAD).To solve the problem,Siemens SCL language is introduced here to complete the design of the control strategy,and the control program is written in combination with LAD.Finally,the visualization of the control process is realized through the design of Win CC configuration system.The specific work is as follows:(1)The modular programming method combined with LAD and SCL language is used to complete the design and realization of the elevator control program.The initialization module,floor counting module,call registration module and elevator operation module are analyzed in detail.The design procedure can ensure the safe and reliable operation of the elevator.(2)In order to improve the operation efficiency and reduce the waiting time of passengers,the various operating conditions that appear in the elevator operation are classified,and the elevator dispatching scheme is designed respectively,and the design of the control system based on the minimum waiting time is realized,and the minimum waiting time is designed.Ladder time evaluation function.(3)A semi-physical simulation platform with PLC as the controller was built by the combination of software and hardware,and the design of the system login and main monitoring interface was completed.Using Portal TIA,Win CC,and online PLC,the elevator control program and monitoring screen were combined.Simulation debugging,the system operation results meet the design requirements.Finally,the control system design of different control objectives is analyzed and carried out,and the simulation is carried out.Through the analysis of the simulation data,it can be known that the minimum waiting time scheduling principle can effectively reduce the waiting time of passengers;the shortest running distance scheduling principle can effectively reduce the system running distance and the number of starts and stops of the motor,thereby reducing energy consumption;on this basis,The single control goal has the disadvantage of reducing the waiting time of passengers and reducing the energy consumption of the system.A two-objective planning elevator group control dispatching principle is proposed to achieve optimal dispatch of multiple evaluation indicators.The dual-objective scheduling principle takes into account both the waiting time of passengers and the running distance of the system,so that the overall performance of the system has been improved to a certain extent,and when different weight coefficients are selected,different dispatch results will be produced.