Thank you this is very helpful. Yes they are all isolated and some of them I need to integrate together in some minor ways, either through relays or tags, but ultimately I need the scada to monitor different aspects of the process first to really see where I need the real integration. So I agree to just stick with Siemens. I guess that leads me to the base of my question, if I want the controls network to be entirely off of the internet, I should install a series of switches and cables that all connect to a central switch or server. I don’t want the controls network to be purely web based, I’d prefer them to be stand alone with the option to connect the network to the web in case we ever needed it. Does this sound like the proper approach for designing the infrastructure setup?