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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | RE: Alarm annunciation with ALH and other PC based systems |
| From: | Emmanuel Mayssat <[email protected]> |
| To: | Maren Purves <[email protected]>, EPICS mailing list <[email protected]> |
| Date: | Mon, 26 Jan 2015 10:27:58 -0800 |
|
The ALH indeed works well.
But I am not sure this is the most reliable solution for 3 reasons. 1/ The ALH runs on the client PC 2/ The ALH runs on PC hardware. 3/ The ALH can be turned off by operators. (speakers can simply be turned off to make the alarm system fail) To solve this without the ALH, you need to run a back-end service (i.e. on the server side) that filters and dispatches the alarms to dedicated hardware. This is already implemented in BEAST, the CSS alarm handler. A similar architecture is intended to be used for the one part of EPICS Qt. -- Emmanuel Mayssat http://www.epicsqt.org > Date: Tue, 20 Jan 2015 13:59:32 -1000 > From: [email protected] > To: [email protected] > Subject: Re: Alarm annunciation with ALH and other PC based systems > > ALH or something else, sensors can fail too, it doesn't have to > have anything to do with what you're running or what you're > running it on. We recently had an almost whole system shutdown > (thankfully the instruments stayed cold) when the UPS failed > to last through a power outage. > > The old ALH works quite well :) > > Maren > |