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

PLC OMRON Datasheet for Devicenet and CJ1M

Document for omron plc CP1L basic programing. omron plc is very good in the world.