Actually, this is a really smart move.
Siemens controllers are used in air conditioners and facility controllers, as well as Generators in power plants.
You could really clobber infrastructure by knocking power plants offline, locking buildings so access would not be possible, and shutting down Air conditioners in data centers.
Any guesses as to what Nation would want to use such a system?
Anyone?
Yeah. This could be a big deal. Twenty years ago I programmed PLCs for industrial and security (i.e. prisons) systems.
PLCs are used everywhere...factories, power plants, refineries, and the list goes on and on and on.