“There should be no connection between a blast furnace and the internet.”
I don’t understand this drive to put things so critical on the world wide web either.
Now we will have to worry about the connection between the nuclear reactor and the internet.
Hopefully there is none.
When I worked in the factory, our robots worked on their own independent computer system.
We would get our orders from GM by way of the internet but I would enter them into our system manually. It was a secure system only vulnerable to pilot error. Outbound info was sent by internet after bar codes were scanned in shipping. Communication within the shop was conducted face to face or over the phone.