Experimental Physics and
Industrial Control System

"David Dudley" <[email protected]> · Wed, 04 Apr 2007 09:44:42 -0500

Unfortunately, that didn't work.
In vdct, I can set the .VAL field to 1, but when I load the db, the VAL
field is 0.  Setting DOL to 1 causes it to have a 'CONSTANT 1' value
when you do a 'dbpr' on the field, and I have OMSL set to 'closed-loop',
however the .VAL field remains at 0.  If I do a forward link to the
block, it outputs a zero, and the .VAL remains 0.  If a do a 'dbpf' to
set the value to 1, it then works fine.  What I did as a patch around
the questionable action was to use a BI block with its DTYPE set to
'Soft Channel' and an INP of '1' that is linked to the BO, but seems
like a round-about way of doing such a simple thing.

I thought I was probably just missing something on the BO block.

David Dudley

>>> "Paul Sichta" <[email protected]> 4/4/2007 9:20 AM >>>
David,
Can you set the DOL to '1' and use closed-loop control, rather than
the
default supervisory.

-- 
Paul Sichta
Princeton Plasma Physics Laboratory
609-243-3477 

-----Original Message-----
From: David Dudley [mailto:[email protected]] 
Sent: Wednesday, April 04, 2007 10:00 AM
To: [email protected] 
Subject: Outputting a constant value

I have a BO where every time I trigger it, I want to output a constant
value.  Since the .VAL field can't be set to a constant through vdct,
is
there an easy way to force it to have a '1' value all the time?

David Dudley

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System