Experimental Physics and Industrial Control System
>
> > From [email protected] Fri Mar 29 10:50:35 1996
> > Return-Path: <[email protected]>
> > Date: Fri, 29 Mar 1996 17:48:19 +0000 (GMT)
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> > To: Epics Questions <[email protected]>
> > Subject: CALC record question
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> >
> >
> > Can anyone help me with the following:
> >
> > I am trying to reset a value used in a calculation record
> > from a button on a 'dm' screen. The CALC field is set to
> > A+1 and the VAL field is looped back to INPA, so that continual
> > processing of the calculation record gives: 1, 2, 3, 4, etc.
> >
> > I want a button on a 'dm' screen such that when it is pressed, the
> > above calculation starts again at 0. I thought this should be easy
> > but haven't managed it yet.
> >
> > I tried letting the button press put the
> > value 0 into INPB and changing CALC to B*{A+1} so that,
> > normally B=1 and we have as before. When the button is
> > pressed, the record processes once with B=0 and then the
> > whole thing starts again.
> >
> > This doesn't work.
> > I suppose because the above means that INPB needs to take two
> > inputs (the first, a hardwired 1, the second a 0 put into B when
> > the button is pressed).
> > In this case, how can the calculation record know which value it is
> > supposed to be using? Or am I going about this in totally the wrong way?
> >
> > Any help would be greatly appreciated?
> >
> > Cheers,
> >
> > Andy
> >
> > ===================================================================================
> > Andy Foster
> > Royal Greenwich Observatory Tel: 44 (0)1223 374899 (direct)
> > Madingley Road Fax: 44 (0)1223 374700
> > Cambridge E-mail: [email protected]
> > CB3 0HA Home Page: http://www.ast.cam.ac.uk/~ajf
> > UK
> >
> >
> Hi Andy,
> This may work for you. It does not require any new database records.
>
> I am using edd/dm version 2.2.
>
> My calculation record is called counter.
> and has the following properties.
> CALC: B?(B*(A+1)):0
> A: counter.VAL
> B: 1
>
> I made a message button to control counter.B.
> (titled RESET for both inactive and pressed)
> The press message is 0 and the release message is 1.
>
> I hope this helps.
> Rozelle
>
Something I didn't think about when I sent the first message.
If the calculation record is scanned periodically, the
reset button must be held down until the 0 value for B is seen.
Otherwise channel access will put the 1 value into B before the
record is processed and the zero will not be seen.
The reset will work immediately if the record is scanned passively.
Rozelle
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