Re: What's wrong if a PV with DISA=1 still processes?

[Till Straumann <strauman@slac.stanford.edu>]

Are you sure processing really occurs?

Note that DISA does *not* disable changes
to record fields but only record processing
that might be the consequence of a field change.

Hence, even if DISA==DISV==1 you
still might be able to modify the  field associated
with your  'gain'  (and if I read the code right
you'll even post monitors to the field change)
but no record processing will occur (i.e., the
change would not be written out to a device
support module attached to the record)

Use DISP to disallow changes of record fields.

HTH
-- Till

Dayle Kotturi wrote:
> Hello,
>
> I am using SNL to manage the operational mode of a phase and amplitude ctrllr.
> Mode is either CALIBRATING or RUNNING.
> When RUNNING, I attempt to disallow changes to gain setting via entry{}
> clause of state RUNNING where I set DISA to 1 for the gain PV.
> I can see DISA field is set correctly to 1 via dbpr.
> On the EDM GUI, however, I am still able to change the gain.
> The gain is a longout record.
>
> From the doc, I understand that when DISA==DISV==1, processing should
> not occur. Why does it?
>
> It is EPICS R3.14.8.2.
>
> Dayle Kotturi                                            dayle@stanford.edu
> LINAC Coherent Light Source                             office 650-926-4923
> Stanford Linear Accelerator Center                         fax 650-926-4778
>
>