I have just begun communicating my S7-200 with my computer. I want to do this communication with Modbus Protocol. I have already installed Modbus Library on Microwin Software. How must I use MBUS_INIT and MBUS_SLAVE functions if I want to use a VB application that communicates through an OPC Server? Thanks in advance.

 

Hello Inigo, in the MicroWin help there's an explanation of the function and a program example. I did a program based on this example for this purpose. You just have to have your data in modbus accessible registers in your PLC and with an OPC server you can read the data. And, once you have the data in OPC it's possible to read it with any OPC server.

If you want write to me directly so I can send you the program.

Regards,

Engelbert Rodríguez
[email protected]
ICESA
Spain

 

hi.

I can't install Modbus library for micro/win v3.2.
my Lib folder is Empty. Why?

 

Hello "Anonymous"

In the MicroWin CD there´s a folder called "Instruction Library V1.1", just
clic at setup.exe. Be sure to have MicroWin software closed.

Engelbert