# Connecting S7 to PC with Visual Basic

C

#### Claudio

Hello
I must connect PLC S7, Siemens, to PC with Visual Basic, but I don't know the protocol. Where I can find this information ?
Thank You

M

#### Martin Boers

You need an I/O server for the Siemens PLC.

You can buy this server from either Siemens themselves (if you have money to burn) or from a third party.

If you want a server with an OPC interface (which I'd recommend), check out www.kepserver.com/SiemensS7MPI_OPC_ServerSpecSheet.html

I have never used this server, but a demo versions is available for download so you can try it yourself. Another advantage of this server is that you can use the MPI programming cable for comms, unlike the Siemens I/O servers which usually require extra hardware (\$).

Regards,
Martin Boers
Inisys Ltd.
Ireland

J

A

#### Archie G. Mullins

OPC is probably your best bet! Siemens has an OPC Driver in their Softnet Software. It works quite well.