This paper aims at CCM2 protocol of Koyo PLC to develop the relevant OPC-Server by using program technology of serial port,VC6.0 platform and WinTECH Software,which realizes the effective access of the PLC.

• 针对光洋PLC的CCM2协议；通过串口编程技术；并采用VC6.；0和WinTECH开发包开发了相应的OPC-Server；实现了设备的有效接入。