1、 毕业论文 课题： S7-200 对三菱变频器远程 控制 - I - 摘 要 随着计算机网络技术的发展及工厂自动化程度的不断提高 ,开放性和多功能的网络通信要求成为了 PLC 的必备条件。在实际应用中， PLC 主机与扩展模块之间要进行信息交换，PLC 主机与其他主机或其他设备之间也经常进行信息交换。所以通过这次课题的设计对 PLC与变频器之间的通信方式得到一个初步的认识，这次的课题主要学习 S7-200 与三菱变频器之间最基本的通信方式。通过查阅资料把课题拟定， S7-200 与三菱变频器串行口通信研究。定好课题开始学习 S7-200 以及三菱变频器的通信格式， 由 PLC 发出启动、停止、
2、运行频率等指令，来控制变频器的运转及频率输出 。在导师指导下经过多次修改、调试定下程序的梯形图。通过这次课题设计提高了自己独立工作的能力和创造力，加强了对基础及专业的运用能力，让我对 PLC 又加深一步的了解。 PLC 作为工业自动控制的核心部分，单机编程和维护相对简单一点，而工业网络通信要求同时兼顾稳定性、快速性、灵活性及与第三方设备的兼容性，所以工业网络通信成为工业自动化系统设置及实施的难点。 变频器与 PLC 在自由口模式下通信，具有很大的灵活性，方便了工 程应用 。 Abstract With the development of computer network technology
3、 and factory automation degree rise ceaselessly, Open and multi function network communication requirements of PLC become the essential condition. In practical application, the PLC host and extension module to exchange information between PLC host and other host, or other equipment also often exchan
4、ge information. So through this topic design of communication between PLC and frequency converter means to get a preliminary understanding, this topic mainly to learn S7-200 and Mitsubishi Inverter between the most basic means of communication. Access to information through the research protocol, S7
5、-200 and Mitsubishi Inverter serial port communication research. Set the task started learning S7-200 and Mitsubishi Inverter communication format, by the PLC to start, stop, run the frequency of such instruction, to control the inverter operation and frequency output. In under the guidance of a men
6、tor after several modifications, debugging set program ladder chart. Through this topic design improves their ability to work independently and creativity, strengthen the basic and professional skills, let I to PLC and to deepen the understanding of one pace. PLC as the core part of industrial autom
7、atic control, single programming and maintenance of relatively simple, while the industrial network communication requirements of both stability, rapidity, flexibility and compatibility with third party equipment, so the industrial communication networks become industrial automation system settings and - II - the difficulties of implementation. Frequency converter and PLC in free port mode of communication, it has great flexibility, convenient for engineering application.
