IT Rules for Cybersecurity of control systems

How far should we go in adopting IT type rules for the management of cybersecurity on control systems. Will treating a control system as just another set of PCC's (from the IT perspective) cause more problems?

For our IT-challenged friends...

The following is from a friend, from Facebook.

Capitalizing on IT and Manufacturing Convergence

Can't we all just get along? If you're talking about plant floor engineers and corporate IT personnel, the answer often is a resounding "no." However, the usual economic forces have been flowing over this resistant organizational rock, and there's evidence that it too is beginning to wear down.