Experimental Physics and
Industrial Control System

Michael Davidsaver <[email protected]> · Wed, 13 Jan 2016 22:43:41 -0500

Hi Lingyun,

> Is there anyway skip updating any/some of the output PVs in the aSub
routine ?

Nope sorry.  At least no directly.

One slightly ugly workaround is to do the conditional in a second
record.  Then use another of the aSub outputs to drive the condition. 
Something like:

> record(aSub, "...") {
>  ...
>   field(OUTA, "other NPP")
>   field(OUTB, "other.DISV PP")
> }
> record(waveform, "other") {
>   field(DISA, "0")
>   ...
> }

VALB!=0 of the aSub allows 'other' record is processed.  VALB==0
prevents it.  Note that the 'NPP' in OUTA prevents that link from
causing processing.

Michael

On 01/13/2016 05:53 PM, Lingyun Yang wrote:
> Hi,
>
> I am writing a aSub routine to do some multiinput-multioutput data
> analysis.
> In some cases, I do not want to update the output links. e.g. let those
> OUTA-OUTU PVs values untouched.
>
> If I do not do anything to the prec->vala to prec->valu, the
> corresponding PVs still get updated, but with some default values,
> e.g. 0.0 for DOUBLE.
> I also tried to set effective length (e.g. set neva=0), but it did not
> work for an ao record.
>
> Is there anyway skip updating any/some of the output PVs in the aSub
> routine ?
>
> Thanks.
>
> Best regards,
> Lingyun
>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System