This is the only story on the site where the plant is real and we did not build it. The HAI testbed combines a GE steam turbine, an Emerson boiler and a FESTO water treatment train through a hardware-in-the-loop simulator, and the National Security Research Institute published it so that people could test detection methods against it.
We used it for something else: to find out what our compiler does when it meets a plant nobody wrote it for. The answer, with no connector, is nothing at all. It refused all 86 tags. That is the correct behaviour and it is also the number to carry into any conversation that starts with the phrase out of the box.
A connector for that site is about ninety lines: a pattern for the tag shape, a table of what the device letters mean there, and the words its manual uses. Written by reading the manual, in an afternoon. With it, and with the manual treated as the site's paperwork, the compiler places 31 of 86 tags and gets 98% of the quantities right, scored against the units the manual states rather than the text it read.