VB写的位置式PID算法公式源码，是仿照西门子PLC的PID公式写的，在网上碰到好多网友索要，现在公布出来，希望对大家有用-VB to write the position PID algorithm formula source, is modeled on the Siemens PLC PID formula writing, met a lot of friends in the online request, now published in the hope that useful

一个西门子plc编写的pid控制的例子，压缩文件里面是西门子代码，可以参考一下-project of a siemens pid application

关于污水处理厂中生化池中溶解氧的控制，程序使用的是一般的PID控制，PLC模块存放在PLC的CPU中，m文件中有OPC通讯。-About sewage treatment plant biochemical control of dissolved oxygen in the pool, the program uses the general PID control, PLC module is stored in the PLC CPU, m is the file has OPC comm