Experimental Physics and
Industrial Control System

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

Subject:	Alarm severity in PVA
From:	"Cobb, Tom \(DLSLtd,RAL,LSCI\) via Tech-talk" <tech-talk at aps.anl.gov>
To:	"tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date:	Mon, 14 Feb 2022 09:55:13 +0000

Hi all,

In CA, I am used to seeing alarm severity being {NO_ALARM, MINOR, MAJOR, INVALID}. EDM for instance will then colour the widget {default, yellow, red, white} if the PV is connected or display a white box instead of the widget if the PV is not connected.

In PVA (according to the normative types doc) we have {noAlarm, minorAlarm, majorAlarm, invalidAlarm, undefinedAlarm}. My guess is that undefinedAlarm was added to indicate "PV is disconnected somewhere", but I can't find that written down anywhere.

So, my questions are:

Does anyone know why undefinedAlarm was added to PVA?
How should a UI render invalidAlarm vs undefinedAlarm vs "can't connect to PV"?
Is there much of a difference to a user of a UI between those three states?

Thanks,

Tom

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Replies:: Re: Alarm severity in PVA Kasemir, Kay via Tech-talk

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ANJ, 14 Sep 2022

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System