基于S7200PLC五层电梯控制系统设计.docx

基于S7-200PLC的五层电梯的控制系统设计 摘 要 本课题设计的意义在于改变了以往继电器控制的电梯可靠性和稳定性差的缺点，使用变频器调速，完成的主要工作有设定电梯正常运行速度，电梯轿厢加减速控制程序，平层后开关门判断程序以及LED显示部分的电路设计。 鉴于继电器控制存在着上述的种种弊端，现将PLC应用于电梯控制,收到了良好效果。可编程控制器应用于电梯控制，用软件编程替代原有继电器硬件布线控制，使控制系统具有了极大的柔性和通用性。随着人们对其要求的提高，电梯得到了快速发展，其拖动技术已经发展到了调频调压调速，其逻辑控制也由PLC代替原来的继电器控制。本设计在已有的变频器的基础上，采用PLC对电梯进行控制，通过合理的选择和设计，提高了电梯的控制水平，并改善了电梯运行的舒适感，使电梯达到了较为理想的控制效果。 本设计涉及电梯PLC系统的设计安排以及电梯LED数码显示??电梯平层检测元件和PLC的变频器的使用等问题，用STEP7-Micro/WIN32软件来编写电梯程序,通过PLC的开关量断口发脉冲的方式实现电梯变频器的速度给定，其输出点可形成高速脉冲串输出（PTO）或（PWM），整个设计思路正确，有一定的技术含量，虽然是模型的设计，但可用于实际的应用和操作。 关键字：可编程控制器，LED数码显示，变频器，电梯平层 Design of a five-floor elevator control system Based on S7–200 PLC Abstract The significance of the design task was to change the past Relay control of the reliability and stability of the lift poor shortcomings, Use Frequency Control, the main task is set normal operating speed elevator, elevator car speed control procedures, after the switch-layer doors judgment procedures and LED display part of the circuit design. Given Relay control of the existence of the above drawbacks, the programmable logic controller will now apply elevator control, and good results. Programmable controller for elevator control, and software programming to substitute the original wiring Relay hardware control, so that the control system has a tremendous flexibility and versatility. With the improvement of their claims, the lift has been rapid development, Drag its technology has been developed to speed the FM_PM, Logic Control PLC also replace the control relay. The design of the existing converter, which is based on PLC on elevator control, through the rational choice and design, raise the elevator control levels, and to improve the operation of the elevator comfort, the lift reached the ideal control effect. Involved in the design of the lift PLC system design arrangements and lift LED digital display. Elevator-layer components and testing PLC and the use of frequency converter, STEP7-Micro/WIN32 software used to prepare the lift pr