I know I'm not the first one to ask this, but I would like some up to date feedback. I would like to use vb.net to communicate with GE 90-30 PLCs. I'm not new to vb.net, but I'm new to PLCs. I know I would have to buy an activex controller or write my own. Other than that I don't know how to do it. Also, I don't understand how the PLC communicate through the opc's. Feeback would be great!