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<== Date ==> <== Thread ==>

Subject: Re: Alarm Handler and $ALARMCOUNTFILTER
From: Andrew Johnson <[email protected]>
To: [email protected]
Date: Mon, 18 Jul 2011 11:14:15 -0500
Hi Keith,

On 2011-07-18 [email protected] wrote:
> 
> My requirement is to only register an alarm if the value exceeds the
>  threshold persistently for 120 seconds.
...
> The other behaviour I've noticed is that once in alarm, the same criteria
>  is used to decide when to drop down to no alarm. i.e. if the PV value
>  drops below the threshold then it takes inputSeconds before this is
>  recognised, or inputCount drops within inputSeconds. I am just curious as
>  to whether this is behaviour that anybody wants or uses? I'd prefer to
>  drop out of the alarm state immediately.

It's likely that the behaviour implemented was required by someone at APS when 
we wrote ALH, I see it being used fairly heavily in our operational alhConfig 
files.

I would suggest that your alarm filter should probably be implemented inside 
the IOC, rather than rely on ALH to do it.  It's much easier to customize 
there anyway.

- Andrew
-- 
Optimization is the process of taking something that works and
replacing it with something that almost works, but costs less.
-- Roger Needham

Replies:
RE: Alarm Handler and $ALARMCOUNTFILTER keith.baker
References:
Alarm Handler and $ALARMCOUNTFILTER keith.baker

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