Experimental Physics and
Industrial Control System

Benjamin Franksen <[email protected]> · Mon, 17 Dec 2001 15:41:34 +0100

Marty Kraimer wrote:
> 
> Benjamin Franksen wrote:
> >
> > the Record Reference Manual states that UDF field may be modified and
> > even is PP. However, whenever I put some value (1) to UDF field of a
> > passive soft ao record (in order to indicate that the record's value is
> > undefined now), the record's status / severity do not become UDF_ALARM,
> > INVALID_ALARM but remain whatever they are. Subsequent queries of the
> > UDF field give the value 0 insted of 1, although no writes to the VAL
> > field happen in between.
> >
> > Using a dbLink with PP property gives the same results.
> >
> > Looking at aoRecord.c and even dbAccess.c, I found no reason for this.
> 
> This should work. I tried it on soft records and it works just fine.
> 
> The test database is
> 
> record(ao,"mrkjunk")
> {
> }
> record(ao,"mrkjunk1")
> {
>     field(OUT,"mrkjunk.UDF PP")
> }
> 
> The test is
> epics> dbpr "mrkjunk"
> ASG:                DESC:               DISA: 0             DISP: 0
> DISV: 1             NAME: mrkjunk       OMOD: 0             OVAL: 1
> RBV: 0              RVAL: 1             SEVR: NO_ALARM      STAT: NO_ALARM
> TPRO: 0             VAL: 1
> epics> dbpf "mrkjunk1","1"
> DBR_DOUBLE:         1
> epics> dbpr "mrkjunk"
> ASG:                DESC:               DISA: 0             DISP: 0
> DISV: 1             NAME: mrkjunk       OMOD: 0             OVAL: 1
> RBV: 0              RVAL: 1             SEVR: INVALID       STAT: UDF
> TPRO: 0             VAL: 1
> 
> Question. What device support is attached to your ao record?
> Note that record support only checks the ufd field after it calls device
> support.
> Does your device support set ufd 0?

I use Soft Channel (the default), just like you did. Adding exactly the
same database and test calls to my test IOC I get this:

iocTESTIOC1C> dbgf "mrkjunk1.OUT"
DBR_STRING:          mrkjunk.UDF PP NMS 
iocTESTIOC1C> dbpf "mrkjunk","0"
DBR_DOUBLE:         0                   
iocTESTIOC1C> dbpr "mrkjunk"
ASG:                DESC:               DISA: 0             DISP:
0             
DISV: 1             NAME: mrkjunk       OMOD: 0             OVAL:
0             
RBV: 0              RVAL: 0             SEVR: NO_ALARM      STAT:
NO_ALARM      
TPRO: 0             VAL: 0              
iocTESTIOC1C> dbpf "mrkjunk1","1"
DBR_DOUBLE:         1                   
iocTESTIOC1C> dbpr "mrkjunk"
ASG:                DESC:               DISA: 0             DISP:
0             
DISV: 1             NAME: mrkjunk       OMOD: 0             OVAL:
0             
RBV: 0              RVAL: 0             SEVR: NO_ALARM      STAT:
NO_ALARM      
TPRO: 0             VAL: 0              
iocTESTIOC1C> dbgf "mrkjunk.UDF"
DBR_UCHAR:          0         0x0                 

My record does *not* become UDF/INVALID and UDF field is not set to 1.
Rest of the IOC works just fine. Strange. BTW, EPICS Release is 3.13.2.
No error messages during dbLoadXYZ or iocInit.

Ben

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System