Experimental Physics and
Industrial Control System

"Hogben, Colin H" <[email protected]> · Tue, 08 Aug 2017 15:03:16 +0100

On 07/08/17 19:22, Johnson, Andrew N. wrote:

* If the PV represents the VAL field. then the status & severity in updates may be used; in effect, this is effectively a short-cut to getting the VAL, STAT and SEVR fields at the same time.

* If the PV represents any other field, the status and severity in an update are meaningless noise and should be disregarded.

Is that a reasonable approximation?

Yes. You could also use the presence of a '.' in the PV name to switch behaviors since .VAL is the default field if none is specified. Note that IOC PVs are likely to behave differently from those from other kinds of servers (CAS-based), and these rules only apply to IOCs.

OK, the test I am now using is: if the name ends with '.' and up to four

uppercase letters which are not 'VAL' then ignore the status/severity.

It seems to be working OK. As for non-IOC PVs, I'll cross that bridge

when I come to it.

Thanks to all for your help.

--
Colin Hogben
Professional Software/Control Engineer
CODAS & IT Department
United Kingdom Atomic Energy Authority
Culham Science Centre
Abingdon
Oxfordshire
OX14 3DB
Tel : 01235 464948
Web: www.gov.uk/ukaea

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System