Experimental Physics and
Industrial Control System

[email protected] (Ned Arnold) · Wed, 4 Feb 1998 08:03:09 -0600

> > So I was wondering what the rationale behind having the VAL field's
> > PP attribute FALSE on some record types is. It would seem more logical
> > always to set it TRUE (but that might break some existing code I suppose).
> > 
> >   Thanks,
> > 
> >   William
> 
> 
> I looked and the following record types do not have PP(TRUE) set for the
> VAL field.
> 
> calc, calcout, event, fanout, histogram, pal, pulseCounter, pulseDelay,
> scan, and wait.
> 
> It seem reasonable to set PP(TRUE) on the VAL field of all record types.
> Can anyone see a problem if we do this?
> 
> Marty Kraimer

YES ! I think changing these values now would be a great disservice to 
application developers !  There are likely databases that have been designed
to account for this, and if all of a sudden a record gets processed twice
instead of once, who knows ?   Not only that, but this potential erratic
behavior would be VERY difficult to diagnose (even if it is described in the
"release notes" !).

I agree that the rationale for not having them all the same is questionable,
but if it's not broke .... !

	Ned

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System