S7-300 PLC和VC++.NET在电力监控系统中的应用  

Application of S7-300 PLC &(VC++) .NET in Electric Monitoring and Control System

作　　者：张海生[1] 范征宇[1] 

机构地区：[1]上海交通大学自动化系,上海200240

出　　处：《自动化仪表》2006年第8期50-52,共3页Process Automation Instrumentation

摘　　要：介绍了S7-300 PLC及VC++.NET软件在某电力监控系统中的应用情况。重点阐述了该系统的软硬件组成、系统功能及其特点。其中针对目前市场上上位机通信软件专用、不兼容等问题,提出了用VC++.NET实现上位机与PLC通信的方法。硬件采用西门子公司的S7-300 PLC为下位机,按照RS-232C标准与上位机通信;通信协议为自由模式下用户自定义的协议,数据传输格式为具有块校验字符的16进制ASCII编码。该系统自运行以来,各项功能正常、设备运行稳定,完全达到了设计要求。The application of S7-300 PIE ＆ VC＋＋. NET in certain electric monitoring and control system is introduced in this paper. The compositions of hardware and software, functions of the system, and features are described emphatically. As most of the communication software to host computer in the market is dedicated and not compatible, a VC＋＋. NET -based communication approach to the communications between PIE and host computer is proposed. The slave computer S7-300 PIE of SIEMENS communicates with host computer by RS-232C standard. A user - defined protocol created by freeport mode is taken as the communication protocol, and hexadecimal ASCII code with BCC as the format of data transform. Since the system has been put into automatic operation, all the functions work well, and the devices operate steadily, so the requirement of design has reached completely.

关 键 词：可编程控制器 电力监控系统 串口通信 

分 类 号：TP334.4[自动化与计算机技术—计算机系统结构]