毕业设计S7-200PLC 在纸机传动中的应用摘 要 本文是关于纸机传动控制系统的设计，该系统实际上是异步电机变频调速的 PLC控制系统，PLC 和变频器之间通过 Modbus 协议进行串行数据通讯，共同实现对电机的速度同步控制。首先对 PLC 和变频器的工作原理和主要组成进行了介绍，在此基础上，再对变频调速的基本原理进行了一定的讨论。变频器采纳的是 ABB 公司的变频器，因此本文对ACS550 变频器的参数设置也进行了讨论。而 PLC 采纳的是西门子公司 S7-200 系列，变频器和 PLC 之间的通讯协议在文中也有很详细的介绍。最后是系统的具体设计，包括硬件和控制程序的设计，对其设计思路也有相应的讨论，控制程序部分不仅给出了具体的程序，还有相应的注解。该系统能够实现沟通传动的速度链和负荷分配以及张力控制，具有很强的工程模拟性能和有用价值。关键词：可编程序控制器（PLC），MODBUS 协议，变频器Based on the Paper Machine S7-200 PLC Control SystemABSTRACTThis paper is on the paper machine transmission control system design, the system is actually asynchronous motor VVVF the PLC control system, PLC and inverter agreement between the Modbus serial data communication, common to achieve the speed synchronous motor control .First of all PLC and inverter of the working principle and the main components were introduced, on the basis of this, then the VVVF the basic principle of a certain amount of discussion. the inverter is used in ABB's inverter, this converter on the set of parameters ACS550 also discussed.The PLC is based Siemens S7-200 series, Drives and communications between the PLC in the text of the agreement are also very detailed presentation. Finally, there is a specific system design, hardware and control procedures, including the design, its design concept is also a corresponding discussion, the control procedures are not only part of a specific procedure, the corresponding notes. The system can be realized exchange rate of transmission chai...
