Experimental Physics and
Industrial Control System

Andreas Luedeke <[email protected]> · Thu, 25 Apr 2002 17:29:09 +0200

Hi Kay,
another suggestion for the (withdrawn) DRLM solution:
The clamp mode should rather use the PVAL field instead of the OVAL field.

If you have a periodically scanned "ao_reject" record, due to the OROC field slowly ramping
to reach the final value VAL. Now a user writes a new value that is out of the allowed drive range.

   * If the VAL field is now set to OVAL, the record would stop at the current output value, a value
     that was never set by any user or application.

   * If the VAL field is set to PVAL, the record would continue to drive to the last accepted value.

I think the latter is maybe the preferred "reject" behaviour.

Cheers
Andreas

Kay-Uwe Kasemir wrote:

> >I am not happy with the proposed solution.
> Oops.
> I stand corrected and withdraw the proposed DRLM field.
>
> >That doesn't mean that we shouldn't do something about the problem.
> >See below for alternative solutions that reuse or rather extend the already existing
> >features....
> What followed included several important thoughts, thought
> not code. Is anybody out there not 110% busy but would have
> time to look into this?
>
> Meanwhile, whoever needs the described behavior and feels
> that a drive limit mode field fixes it for now:
> You can always add a new record, a copy of the AO record that includes
> the previously emailed diffs, without changing EPICS base.
>
> Thanks,
> -Kay

--
Dr. Andreas Luedeke, PSI/SLS, phone: +41-56-310-4002 fax: -4413
mailto:[email protected], http://people.web.psi.ch/luedeke

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System