PROFIBUS现场总线S7-300 PLC触摸屏论文.docVIP

PROFIBUS现场总线S7-300 PLC触摸屏 摘 要 在PLC控制系统中应用现场总线技术实现PLC与现场设备、客户端、服务器间实时通信，达到分散优化综合控制是工业控制领域的热门问题。综合控制系统设计的优良直接影响着工业生产的经济性。深入研究应用PLC及现场总线控制技术会为我国在工业自动化领域的进一步发展做出有益贡献。 工控行业领军企业的西门子的PROFIBUS与SIMATIC系列PLC控制系统提供了完善的软硬件支持和系统的解决方案。这样缩短了工控系统的开发周期，扩展了设备间的通信能力，优化了软件设计，增强了系统兼容性。因此从理论上研究PROFIBUS现场总线以及深入探讨西门子SIMATIC系列PLC能够拉近我国工业自动化与外国的差距，提升我国自动化产业的竞争力。 本文从分析PROFIBUS现场总线技术入手，研究PROFIBUS-DP协议及其报文结构，阐述SIMATIC S7-300系列PLC中PROFIBUS总线的应用。用PLC取代原有继电控制系统，完成了硬件选型，程序块定义及梯形图程序编辑及仿真调试、下载，实现了对电机调速系统监控的设计。 这一研究的目的在于实现基于PROFIBUS现场总线的Siemens PLC S7-300控制系统设计及组态，包括PLC控制系统设计、上位机管理和监控系统设计。对于总线协议的研究可以更深入的掌握PROFIBUS的通信机制。PLC控制系统与现场总线技术的结合，实现了系统高速实时通信的目的，增强了系统的稳定性，安全性和实时性。 关键词：PROFIBUS现场总线；S7-300 PLC； Abstract Now PLC control system is widely studied and applied in the field of industrial automation. PLC control system conbine with Field-Bus will keep PLC,Field-unit, client and service computer in real-time communication. This control system afect the industry production directly. So the combination of PLC control system and Field-Bus will become the hot spot in near future.The works of study and application of this combine system will enhance competence in this field of our country. Siemens, one of the most successful supplier of automation products in world wide,has successfully supply a series of software and hardware base on PROFIBUSand PLC. It has enlarged the ability of communication among field units, shortened the research cycle, optimized the software application, enhanced the system compatibility. So we should study the PROFIBUS Field-Bus from the theory of protocol level, and far more study the SIMATIC PLC. Those works will improve tech. a lot. This article describe the application of PROFIBUS in SIMATIC S7-300PLC, configure the hardware of the production line of wires in STEP 7,study the theory of PROFIBUS,analysis the protocols and message structure of PROFIBUS-DP define blocks of PLC. The purpose of this study is to design Siemens PLC S7-300 contorl system base on PROFIBUS Field-Bus. Thi