计算机PC与PLC通过RS232串口进行通讯的源码

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

An example of establishing communication between siemens HMI and PC. HMI project has been attached here alonmg with vb project. Communication medium is MPI. Data is read/write through VB user form into siemens PLC.