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Obsolescence
andProcurement
of SCADA
Bernie Pella
INTRODUCTION
Obsolescence in industrial control systems has a signicantly different meaning than
in the enterprise network environment. Most newly installed industrial control sys-
tems are obsolete by normal IT standards. An enterprise computer system has a
three- to ve-year lifecycle. An industrial control system has a 15–30-year lifecycle.
Even today with Microsoft Windows 7 as an aging operating system, Windows 8
will be out within the next 12 months, a large segment of the currently operating
industrial control systems are running Microsoft Windows 2000, 2003, or XP. Some
industries continue ...