wizdum:
And those PLCs were usually plugged into computers running unpatched or pirated versions of Windows XP.
I have dozens of PLC's under my control at work, none of them require attachment to a PC, and when they do its typically via a GPIO interface (ISA PCI USB whatever) sending single bits on single channels
not saying that machines dont use direct computer connections over some bus, but its typically a very simple bus, much like an arduino ... so unless your saving raw data from a plc, packing it up and running it as a windows exe, its not that big of a deal