vb上位机控制系统.doc

姓名：赵远新 编号：000121 2009年04月10日 摘要 随着pc及其外部设备的普及和降价，越来越多的自动控制系统已经开始与PC联机进行监控。监控就是要做到可以随时监视并控制负载运作情况，与传统的现场控制不同，本系统可以在控制室（与现场距离上百甚至上千米）下令改变现场负载的运作情况。而这所有的过程只需要使用PC的一个COM口,即RS232串口与单片机进行双向数据通讯，并且系统使用简单易上手的vb语言编程，所需硬件简单易行，在标准的D型接口如DB-9或DB-25接头中只需其中三条线即可，如下图所示。本控制系统的基本作功能为通过上位机的监控窗口可以随时监视并控制下位机负载运作状态，窗口中可实时显示负载状态信息。同时下位机也实时的对上位机指令执行相应的动作，1602液晶显示作为现场的人机对话装置作为现场控制，实现和PC上位机控制相同的功能。温度控制系统作为从属系统也受上位机控制,能完成温度自动调节,实时报警显示功能,将现场温度控制在一个可以任意设置的范围内.并且该设计具有欢迎界面、音乐播放和管理员密码窗口，更实际的模拟了工业实际应用中的情况。更重要的是，该系统易于扩展和嫁接，经过稳定性和抗干扰性测试之后便可用于工业实际中去。 关键字：上下位机 串口通讯 液晶显示 工业控制 温度控制 示意图： 摘要译文 With the popularity and the following price of Pc and it’s peripherals, more and more automatic control system has already started working with the PC ,monitoring and controling online. Monitoring can be done is to monitor and control the operation of the loads, which is different with the traditional control ways, we can ordered the change in the operation of the load in the control room of the system (the distance which away from it can be even hundreds of kilometers far). At the scene All the process which only need to use the PCs COM port or RS232 serial port with the 51 single-chip two-way data communications.System uses a simple programming language VB as the main programming language ,the hardware of the system is simple,too. Standard interface, such as the D-type DB-9 or DB-25 connector in only three lines of which can, as illustrated below. The control system for the basic functions of the PC monitor through the window at any time to monitor and control the operation of the state of load-bit machine, the window can be displayed real-time load status information. At the same time are also lower on the PC real-time implementation of the action command, 1602 LCM and keyboard at the scene is the man-machine dialogue scene control devices, and PC host computer to achieve the same function as the control. Temperature control system as a slave system also controlled by the host computer can automat