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

Subject: Re: How to tag soft channels as undefined/disconnected
From: Maren Purves <[email protected]>
To: [email protected]
Date: Tue, 12 Aug 2014 13:37:56 -1000
On 08/12/14 13:26, Allison, Stephanie wrote:
Hi Kellee,

You may want to read the tech-talk thread on back-propagating error
states starting with this message:
http://www.aps.anl.gov/epics/tech-talk/2009/msg00689.php

I assume you want to invalidate your data, not show it as
"disconnected".

Basically, you set a record (ie, a bo record) to indicate the
validity of your data - you will set it up so that record has either
a NO_ALARM or INVALID severity.  Then you use that record in the SDIS

I think I would just use the VAL field here.
You can send out alarms or make decisions on the basis of the VAL
field - what you call it is up to you.

I realize that's not the exact same thing ...

field of the record with the data and use "CP MS" to maximize the
severity (make sure DISV is set so it will never actually disable).

If you don't want to use the disable feature of the record for the
purpose of invalidating your data (it is a real kluge after all),
then you can always FLNK your data record to a calc record that has
as input both your data record and your validity record and maximizes
the severity of both.  All your clients then use the calc record
instead of the data record for display and alarming.


HTH,
Maren

References:
How to tag soft channels as undefined/disconnected Kellee Summers
RE: How to tag soft channels as undefined/disconnected Allison, Stephanie

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