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Regarding PLCs, we have our controllers on a separate network with no access to the back office or the Internet. The managers have to be on site to get real time information. There are a couple of PCs that provide information to other systems for dashboards etc. they can push information out to a dedicated server, which then sends the information to the correct services.
Those PCs cannot be reached from outside, the firewalls in the production facility let them send data to a single IP address on a single port, but the recipient can’t send data back.