莱LIAO编了一个PLC－PC监控程序，初试一下与PLC通讯真的还可以用。不过对初学者的我，我已很满足。也欢迎高手指点一下。-Lai LIAO wove a PLC, PC monitor, really can use first try the communication with PLC. But for beginners of I, I am very satisfied. Also welcome to ace to give directions.