Hello:
Some time ago I developed a Visual Basic 6 application to send and receive data over an Ethernet network from between a PC and special equipment using standar TCP/IP text telegrams.
Actually the customer wants to replace this equipment for an array of Siemens S7 PLCs, they want me to modify this Visual Basic application to send this data to the S7 Plcs over a Profibus network.
I need to know what I have to add to my Visual Basic application in order to get the communication between the old PC and the new S7 Plcs. There's a library or software that I can purchase so I don't have to change the Ethernet card? I need to purchase a Profibus Card to get this working?
Thanks in advance for your help.
Regards.
Chalpa