本文介绍了一个使用Visual C++编写的通信程序，主要实现微机与OMRON PLC间的通信，并对它们间的通信协议 -This paper describes the use of a Visual C communications prepared by the procedures, major PC and PLCs of communication, as well as communication between their agreement

为初学者接触西门子PLC和变频器通信的主要手册-。-The converter software is the Siemens equipment, such as Siemens USS protocol and communication procedures of the s7200.