SEU小型PLC改进设计及其在并纱机改造中的应用

发布时间：2019-02-13 04:01

【摘要】：我国作为制造业大国,对PLC产品的需求量非常巨大,但目前国外品牌的产品却占据了绝大部分的市场份额。因此,开发具有自主知识产权的PLC具有十分重要的意义。本课题组曾开发出一种小型PLC的主机,为了将其应用到并纱机改造项目中,本文对该PLC的可靠性、可扩展性和通信能力三个方面进行了改进设计。论文的主要内容如下：首先,分析了并纱机改造的现实需求。在此基础上,针对SEU小型PLC现有的不足,设计了PLC功能改进的方案。为PLC新增了I/O扩展模块、U盘读取模块以及掉电保护功能模块。其次,分析了小型PLC的硬件结构,设计了PLC的I/O扩展模块、U盘读取模块的核心电路,设计了PLC主机的掉电保护电路。按照通信的功能需求分别对CAN总线通信模块和USB存储设备读取模块进行了通信协议的制定以及软件的实现。然后,在分析了并纱机的工作原理之后,完成了并纱机控制系统的硬件选型以及硬件接口电路的设计,在小型PLC的编程工具中进行了梯形图程序的设计。利用PLC主机、I/O扩展模块和PC将并纱机改造成具有底层控制和上层管理的PLC集散控制系统,实现了通过上位机对并纱机进行断纱监控。最后,对小型PLC的功能进行测试,并在整机基础上完成并纱机控制系统的实际试验。结果表明本课题设计的并纱机控制系统能以最高800米/分的速度进行并纱, 并能实现断纱监控,满足合作方的需求。
[Abstract]:As a large manufacturing country, China has a huge demand for PLC products, but the foreign brands account for most of the market share. Therefore, the development of PLC with independent intellectual property rights has a very important significance. Our group has developed a small PLC host. In order to apply it to the reconstruction project of parallel spinning frame, the reliability, extensibility and communication ability of the PLC have been improved and designed in this paper. The main contents of this paper are as follows: firstly, the paper analyzes the practical requirements of the modification of parallel spinning frame. On this basis, aiming at the deficiency of SEU small PLC, the improvement scheme of PLC function is designed. I / O extension module, U disk reading module and power loss protection module are added to PLC. Secondly, the hardware structure of small PLC is analyzed, the I / O extension module of PLC, the core circuit of U disk reading module and the power loss protection circuit of PLC host are designed. According to the function requirement of communication, the communication protocol and the software implementation of CAN bus communication module and USB storage device reading module are developed respectively. Then, after analyzing the working principle of the parallel spinning machine, the hardware selection and hardware interface circuit design of the parallel spinning machine control system are completed, and the trapezoidal diagram program is designed in the programming tool of small PLC. By using PLC host, I / O extension module and PC, the parallel spinning machine was transformed into a PLC distributed control system with bottom control and upper layer management, and the yarn breaking monitoring system was realized through the upper machine. Finally, the function of the small PLC is tested, and the actual test of the control system of the spinning frame is completed on the basis of the whole machine. The results show that the control system designed in this paper can combine yarn at a speed of up to 800 m / min, and can realize yarn breaking monitoring to meet the needs of the partners.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TS103;TP273

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