Experimental Physics and
Industrial Control System

Good evening, all.

I am altering an old OPCUA IOC that was running here in the lab and i noticed that someone configured several records with the DISS field set to "INVALID". When the IOC is running, all of these records have the fields .SEVR set to "INVALID" and this was messing with some interfaces made with pydm. The records have no HSV, LSV or similar fields defined and cagetting into DISV and DISA fields revealed that they are at default value.

Im assuming the DISS field is responsible for the .SEVR INVALID value, but searching in the web all i could find about DISS was: "When this record is disabled, it will be put into alarm with this severity and a status of DISABLE_ALARM." and this is not clear for me: shouldnt the records only have "INVALID" value at .SEVR if they were disabled (which is not the case since DISV and DISA are at default)?

I altered the DISS field to DISABLE_ALARM and now the records display NO_ALARM. Is this coherent? Am i altering any other functionality of the IOC without knowing?

Thanks in advance and best regards,

Marco.