Re: Alarm annunciation with ALH and other PC based systems

[Maren Purves <m.purves@jach.hawaii.edu>]

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

On 01/20/15 13:43, Emmanuel Mayssat wrote:
> Interesting thread.
> If I understand your email correctly, you are using the old ALH on a PC.
> Well, if you are sticking with this setup then the best way may be to
> dedicate a computer to run the ALH
> and put it behind a glass so that no one can touch it! Put the speakers
> out of reach as well.
>
> Are you open to using something else other than the ALH?
>
> --
> Emmanuel Mayssat
> http://www.epicsqt.org
>
>
>  > Date: Wed, 14 Jan 2015 13:27:14 -0800
>  > From: bomr@triumf.ca
>  > To: tech-talk@aps.anl.gov
>  > Subject: Alarm annunciation with ALH and other PC based systems
>  >
>  > Hi All:
>  >
>  > Sorry that this isn't really an EPICS question, other than the tenuous
>  > connection via Alarm Handler.
>  >
>  > The question has been raised here about how to ensure that the audible
>  > alarms from Alarm Handler are always audible. A number of places exist
>  > where this can be disabled. The speakers can become faulty, the
>  > wall-wart commonly used to power the speakers can become disconnected or
>  > faulty, the volume control on the speakers can be turned down, the host
>  > OS software controls can be turned down or muted either through accident
>  > or software fault, audio cables can become faulty, and sound card
>  > hardware can become faulty. Most of these will manifest only in silence.
>  >
>  > Has anyone undertaken measures to monitor any of these components in
>  > some way, or implemented hardware which is not subject to the common
>  > frailties of commodity audio equipment used for control room alarms?
>  >
>  > Any suggestions cheerfully accepted. Thanks.
>  >
>  > Rod Nussbaumer
>  > E-Linac Controls, TRIUMF
>  > Vancouver, Canada.