我刚接触西门子PLC，昨天刚装了一个SIMATIC Manager!
我编了一个300的一段程序、可是运行download的时候，出现“A connection between your PC/programming device and the PLC cannot be established.”显示的帮助为“Select a valid logical interface using the program "Setting the PG/PC Interface" which you can call from the Control Panel.”我不知道如何处理，试了好多次也没成功！特请教高手。谢谢