602 Definition of protective functions shall operate autonomously

Created: 19 Feb 2008

Status: Discussion (red)

Part: Part 3 (2003)

Links:

Page: 15

Clause: 4.2.3

Paragraph:

Category: Issue for edition 2 of this part

Issue

It is mentioned that Protective functions shall operate autonomously. What is the definition of autonomously? Does this means that trip messages should not be send by hubs/routers/switches that are part of the SAS?

Proposal

Discussion	Created	Status
autonomously means: independent of all other functions which are not needed for the protection task. Thus, if the trip is given by wires, then any switch / hub failure (e.g. permanent sending) should NOT influence it. If however the system is purposely designed to send the trip via a switch, then this switch belongs to the protection function.	22 Feb 08	Discussion (red)

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