Experimental Physics and Industrial Control System
Hi,
Here at JET, I'm developing bridges (both directions) between EPICS
Channel Access and our home-grown Object Monitoring System. I've come
across what to me seems like unexpected behaviour, which I can
demonstrate with standard CA tools.
First I start softIoc with the following database:
record(ao, "chah:ao") {
field(HIGH, 10)
}
Next, I monitor the HIGH field:
gen-pub-11:~ $ camonitor chah:ao.HIGH
chah:ao.HIGH <undefined> 10 UDF INVALID
My first surprise is that the HIGH field is reported as undefined, when
it clearly has the value I configured. But it gets weirder. I now do a
caput chah:ao.HIGH 11
and the camonitor spits out an update:
chah:ao.HIGH <undefined> 11 UDF INVALID
However, if I start a new camonitor, I get
gen-pub-11:~ $ camonitor chah:ao.HIGH
chah:ao.HIGH 2017-08-07 10:30:55.033976 11
So is it undefined or not? I find it surprising that the last output
from camonitor should differ depending on when I start it.
Any illumination welcome!
--
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
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