Experimental Physics and
Industrial Control System

> But if the IOC hosting PV1 is up and running, then PV1_ALIAS is not
> invalid 
> even when PV1 itself is invalid. I suppose I could create an alias
> process 

You may want to look at MS and NMS flags as described in the EPICS IOC
Application Developer's Guide.

field(INPA, "PV1 MS NPP")
MS (maximize severity) means that the alarm severity is propagated
across the link.

--
Emmanuel

References:

Calculating status with invalid/non-existant inputs Andrew Starritt

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