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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
>
Replies:
Re: Alarm annunciation with ALH and other PC based systems Maren Purves
References:
Alarm annunciation with ALH and other PC based systems Rod Nussbaumer
RE: Alarm annunciation with ALH and other PC based systems Emmanuel Mayssat
Re: Alarm annunciation with ALH and other PC based systems Maren Purves
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