Computer viruses and worms are big topics in the IT world. Recent worms and viruses have infected company LANs (local area networks) and even shut down businesses. While these concerns were already important in the IT environment, they had not been as important in the control system environment. With the increasing use of standard Ethernet and Microsoft operating systems in control systems, infection concerns now have to be considered in control system design and support. As proof of this, several companies have had to stop production because of recent attacks and because of actions taken in response to the attacks. Part of the modern control system engineer's skill set must include knowledge of how to protect networked control systems. The ISA TR99.01 Technical Report on Security Technologies for Manufacturing and Control systems is a good place to read about technologies you will need to apply.
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