Re: Records for slow control

[Maren Purves <m.purves@eaobservatory.org>]

If you really want to stop it instead you could set it to process PASSIVE.

Maren

On 08/27/15 07:32, Mooney, Tim M. wrote:
> You don't actually have to stop the calc record.  You could just stop
> the value from increasing.
> The following expression holds the increasing value in the 'a' field,
> and increases it by 'b' until
> it reaches 'c'.  Then it returns the value of 'a' as the expression result.
> a:=((a+b)>c?c:a+b); a
>
> Tim Mooney (mooney@aps.anl.gov) (630)252-5417
> Beamline Controls Group (www.aps.anl.gov)
> Advanced Photon Source, Argonne National Lab
>
> ------------------------------------------------------------------------
> *From:* tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on
> behalf of info22@online.de [info22@online.de]
> *Sent:* Thursday, August 27, 2015 12:16 PM
> *To:* EPICS Tech-Talk
> *Subject:* AW: Records for slow control
>
>
> Hello,
> and how can I stop a calc record?
>
> I want to set a new value like 100, 200, 300 V.... then I want to
> compare this value with the current value and increase or decrease this
> value every 10 seconds in 5V-steps. ‎Maybe someone have an idea. One
> problem is to stop the calc record if current value = new value.
>
>
> Thanks.
> *Von: *Mooney, Tim M.
> *Gesendet: *Mittwoch, 26. August 2015 17:20
> *An: *info22@online.de; EPICS Tech-Talk
> *Betreff: *RE: Records for slow control
>
>
> There are two databases in the synApps std module that demonstrate
> different ways of doing this with EPICS records:
>
> std/stdApp/Db/timer.*
> std/stdApp/op/adl/timer.*
>
> std/stdApp/Db/countDownTmer.*
> std/stdApp/op/adl/countDownTimer.*
>
>
> Tim Mooney (mooney@aps.anl.gov) (630)252-5417
> Beamline Controls Group (www.aps.anl.gov)
> Advanced Photon Source, Argonne National Lab
>
> ------------------------------------------------------------------------
> *From:* tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on
> behalf of info22@online.de [info22@online.de]
> *Sent:* Wednesday, August 26, 2015 5:09 AM
> *To:* EPICS Tech-Talk
> *Subject:* AW: Records for slow control
>
>
> Hello,
> but I want to increase the value for example every hour. The time have
> to be variable so I need a calcout timer to count for example every 10
> second from 0 to ‎50 and then to increase the value step by step. My
> problem is how to realise  this with two records. One have to increase
> +1, then go to the timer record and wait for example one hour set value
> and again: increase +1, then process timer or counter for slowly
> periodic scan, set value.
>
>
> Thanks.
> *Von: *Ralph Lange
> *Gesendet: *Mittwoch, 26. August 2015 11:58
> *An: *EPICS Tech-Talk
> *Betreff: *Re: Records for slow control
>
>
> On 26/08/2015 11:39, info22@online.de wrote:
> > Hello,
> > I want to set a value like 200 ampere and increase the current value
> > slowly but how?
> >
> > I have a timer-record with a PROC field with the option "transition to
> > zero". A second record increase the value every time. Is it possible
> > to create records like this:
> >
> > • Calcout1 timer: scan every second from 1 to 10
> > • -» then process Calcout2 (via PROC field, without SCAN field) from 1
> > to 3
> > • Calcout2 have to wait, process Calcout1 again...
> In the ao record that is setting your value, set the field SCAN to "1
> second" (or how often you want to "slowly" update) and the field OROC to
> the step size that you want to the value to change every time (e.g. 0.1).
> No other records needed.
>
> Now, when you write a value like 200 to that record, the output will
> step up by 0.1 every second. (Or whatever step size and update rate you
> configured.)
>
> Hope this helps,
> ~Ralph