Re: Outputting a constant value

["Ned D. Arnold" <nda@aps.anl.gov>]

David -

I seem to remember (when I actually worked with this stuff) that setting the DOL to 1 only worked for Soft Channel BOs.  Try setting DOL to a link that is always one (e.g. DISV or DISA of the same BO record) and OMSL to closed_loop.  This way it will always fetch a 1 for the output.  This eliminates the need for the extra BI record you described.

Ned

David Dudley wrote:

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" <PSichta@pppl.gov> 4/4/2007 9:20 AM >>>
        

David,
Can you set the DOL to '1' and use closed-loop control, rather than
the
default supervisory.


  

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