OPC服务器范例，同步通讯,采用OPC3.0标准-OPC server demo ,sy

An example of OPC data interface with PC. It contains a MS-Excel workbook along with a PLC Software written in STL S7 v5.5. It is also having a user manual which gives step by step quidance for configuring OPC server in PLC and OPC client in vba scr