Experimental Physics and
Industrial Control System

"Pedersen, UK (Ulrik)" <[email protected]> · Fri, 9 May 2008 13:43:21 +0100

Mark is right - my application is using waveform records and I have
tried several different methods using calc, calcout, sel, and seq
records until I arrived at the solution to dynamically switch the links.
The problem is that none of the above mentioned records can handle
arrays (waveforms)...

The solution to use CA in the sCalcout OUT link seems to work well and
I'll continue using that method. I don't really want the users to
directly change the links - that's why I'd prefer to let the sCalcout
record do the job. 

Thanks for all your responses!

Cheers,
Ulrik

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Mark Rivers
Sent: 08 May 2008 20:54
To: Hauschildt-Purves, M (Maren) (HAWAII,Jac); Tim Mooney
Cc: [email protected]
Subject: RE: Change input links run-time in a db

I believe the application in question was using waveform records, which
cannot be fed into a calc record.  They needed to switch the input link
of the waveform record.

Mark

________________________________

From: [email protected] on behalf of Maren Purves
Sent: Thu 5/8/2008 2:31 PM
To: Tim Mooney
Cc: [email protected]
Subject: Re: Change input links run-time in a db

Ulrik, Tim,

my first reaction was: why do you want to do this anyway?

Can't you just feed both channels, and a "switch", into a calc record or
some such and switch values?
Is there a good reason to actually switch the input _channel_ rather
than just the value?

Aloha,
Maren

Tim Mooney wrote:
> Dear folks,  Changing links at runtime has to be done via Channel
Access.
> This is documented in the App Dev Guide (15.5 Runtime Link
Modification).
> The reason isn't documented there (or at least I haven't found it) but

> anyway it's because lock sets have to be recalculated, and you can't 
> do that while you're running under the protection of a lock set that's

> going to be recalculated.
>

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System