Typical lifecycles for main equipment types

1 January 2000

Typical lifecycles for main equipment typesWhere:Sale life = The period the commercial product is sold by the manufacturerSupport life=The period the manufacturer will provide support for the product through spares or call outExtended support= The period by which the support for the product can be extended by other means, for example, by acquiring a sufficient stock of spares or using an alternative repair service.

	Sale	Support	Extended
Equipment types	(years)	(years)	support (years)
Mainframe computers
(eg DEC VAX or ALPA)	3	5	5
PC based (eg SCADA)	1	3	3
Distributed control systems (DCS)	10	10	5
Programmable logic controller (PLC)	10	5	2
VMS (IEEE 1014, 32 bit bus systems)	12	5	5

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