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The perenial "Nuclear Power Plant" example

The perenial "Nuclear Power Plant" example

Posted Oct 12, 2004 19:50 UTC (Tue) by jens.richter (subscriber, #20650)
In reply to: The perenial "Nuclear Power Plant" example by sbergman27
Parent article: Approaches to realtime Linux

Modern digital I&C safety systems require a hard realtime OS, yes it's true!

The timer tick of a system I know is 1 ms.

The response time of the I&C safety system to start the shutdown of the reactor in case of emergency is typically in the range below 1s.

You need a realtime OS, but the timig requirements are less dramatic than we think.


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The perenial "Nuclear Power Plant" example

Posted Oct 13, 2004 9:52 UTC (Wed) by pwaechtler (guest, #5075) [Link]

>Modern digital I&C safety systems require a hard realtime OS, yes it's true!
>The timer tick of a system I know is 1 ms.

The event is not triggered by the timer - it's interrupt driven.
Speak about interrupt latency in the range of 3-10 us and
scheduling latency in the range of 5-100 us.

http://www.qnx.com/developers/docs/qnx_4.25_docs/qnx4/sys...


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