Experimental Physics and
Industrial Control System

Don Dohan <[email protected]> · Mon, 14 Sep 2009 23:18:27 -0400

If you mean the pv crawler used for the IRMIS RDB, the crawler extracts and
stores both the record name and user defined field type instance values.
The crawler maintains a link to the dbd file used in defining each record,
making it possible to reconstruct the full record using both user defined
field values and default field values.

PVs, however are still something a little different - see Kay Kasemir's
explanation

On 9/14/09 9:09 PM, "Matthieu Bec" <[email protected]> wrote:

> 
> Hi all,
> 
> I'm having a terminology issue someone might help with, because the
> comments posted on this thread appear to mix 'record' and 'PV'
> terminology interchangeably. Most of the time it's clear, and although
> there is a reasonable '1 to n' relation between the two, I can think of
> example that relation can break. To give an example, say:
> 
>     ioc1 uses old xxx record type, that does not have .YYY field
>     ioc2 uses new xxx record type, that has a new .YYY field
> 
> xxx 'record' (dbl/dbgrep etc) report the same thing.
> but ioc2 use a newer version that might add/remove some fields (that I
> think is what we really call PV = I think of it as the entity you get
> over channel access)
> 
> So what does pvCrawl really look at: PVs or records? does it figure in
> my example field .YYY exists in ioc2 but not ioc1?
> 
> Thanks
> Matthieu

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System