...Say in those industry cases that when you've reached the ceiling of functionality with your PLCs, because now you want to add on board processing, custom electronics, vision or motion to your system without redesigning the entire thing by the nature and characteristics of a production line, a programmable automation controller (PAC) can help...but because a PAC combines the functionability of a PLC and a PC, security problems are at another level, taking into account threats like "airhopper", "bitwhisper", "diskfiltration ", "fansmitter" to name some...

Great article...Thank for sharing it...