Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> · Fri, 17 Mar 2023 08:35:15 -0700

On 3/15/23 16:50, Ignacio Arriagada via Tech-talk wrote:

Hello everyone,
I'm trying to configure a PVA group using a json file, but I get the following error:

...

*synch:Page1: Error Group not created: NULL channel
synch:Page2: Error Group not created: NULL channel*

...

The group is defined in *cemSoftIoc.json* as follows:

...> And the database is defined in *cemSoftIoc.db* as follows:
...

If I define the same groups within the database using the q:group definition it works without issues. But trying the json definition, it fails because of a null channel.

I suspect that this issue is fixed by a change to the pva2pva module
which has not yet been released.  With it, I am able to load a
modified version of cemSoftIoc.db  (change genSub -> aSub, remove
UF* fields) and cemSoftIoc.json.

https://github.com/epics-base/pva2pva/commit/db5af06e07b726b17422413a8176201d3687bdf9

$ softIocPVA -m top=synch: -d cemSoftIoc.db -G cemSoftIoc.json

Starting iocInit

############################################################################
## EPICS R7.0.7.1-DEV
## Rev. R7.0.7-128-g6399af2037deb2b75eb8-dirty
## Rev. Date Git: 2023-03-12 09:15:10 +0000
############################################################################
recGblRecordError: aSubRecord::init_record - SNAM subr not found Subroutine not found PV: synch:CmplxData
iocRun: All initialization complete
epics> dbgl
synch:Page1
synch:Page2
epics>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System