Re: PVA OUT Links in EPICS:

[Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov>]

On 6/8/26 4:13 PM, Varuna Crishan Meddage via Tech-talk wrote:

I have an analog output record which outputs to another analog output record (published by different IOC) as defined below

================================================================================

record(ao, "PIP2:CTRL_MPS:4:AO:SLOW_SET:CH:1") {

    field(OUT, {pva:{"pv":"acq2106_345:4:AO:SLOW_SET:CH:1"}})

}

...

Is it possible to get rid of this invalid severity even before writing a value to this PV ?

I tried different tricks for example setting field(VAL, "0") and field(PINI, "YES"), but none of them was successful.

For me, initializing VAL to 0 does clear the severity.  Although if you are looking at "dbpr" output, it is necessary to look closely as this "trick" does _not_ zero STAT.  Which is ok, as STAT field only has meaning if SEVR!=0.

Loading the database shown above.

epics> dbpr PIP2:CTRL_MPS:4:AO:SLOW_SET:CH:1  
AMSG:               ASG :               DESC:               DISA: 0              
DISV: 1             NAME: PIP2:CTRL_MPS:4:AO:SLOW_SET:CH:1  NAMSG:               
OMOD: 0             OVAL: 0             RBV : 0             RVAL: 0              
SEVR: INVALID       STAT: UDF           TPRO: 0             VAL : 0             

Loading the following:

record(ao, "PIP2:CTRL_MPS:4:AO:SLOW_SET:CH:1") {
   field(OUT, {pva:{"pv":"acq2106_345:4:AO:SLOW_SET:CH:1"}})
   field(VAL, "0.0")
}

I then see:

epics> dbpr PIP2:CTRL_MPS:4:AO:SLOW_SET:CH:1  
AMSG:               ASG :               DESC:               DISA: 0              
DISV: 1             NAME: PIP2:CTRL_MPS:4:AO:SLOW_SET:CH:1  NAMSG:               
OMOD: 0             OVAL: 0             RBV : 0             RVAL: 0              
SEVR: NO_ALARM      STAT: UDF           TPRO: 0             VAL : 0             

Note the different values of SEVR.