Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  <20032004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  <20032004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019 
<== Date ==> <== Thread ==>

Subject: Re: initialize of mbbi state labels
From: "Hoff, Lawrence" <hoff@bnl.gov>
To: tech-talk@aps.anl.gov
Date: Mon, 03 Mar 2003 15:58:08 -0500


Bob Dalesio wrote:

I would put it into the device support initialization area -


	Would you worry that one cannot guess what the options might
be from an inspection of the .db file? Do you think it might be prudent
to put default values in the .db file, or would that just cause more
confusion if/when the defaults are overwritten by the device support
record initialization?



A problem would be if the assignment of these values can change. Channel access clients monitor the value as a short and only send the string assignments at connection time. So that is a possible problem. If they can change - you may want to map them from a static assigment to the dynamic values in the device support only - and not export the fact that the strings are assigned different values at different times.


	Good point! For the H/W I had in mind, the configuration could
only take place with the H/W off-line. If bringing the H/W back online
requires an IOC re-initialization, then I infer that problem is moot.

	If, however, the H/W is expected to be reconfigured online
(e.g. if it is connected via ethernet or a "field bus"), then it
requires the special care you mention.

-- Larry


References:
Re: initialize of mbbi state labels Bob Dalesio

Navigate by Date:
Prev: RE: initialize of mbbi state labels Mark Rivers
Next: converting from R3.13.0Beta12 to R3.13.8 Kevin Tsubota
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  <20032004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019 
Navigate by Thread:
Prev: Re: initialize of mbbi state labels Bob Dalesio
Next: RE: initialize of mbbi state labels Mark Rivers
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  <20032004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019 
ANJ, 10 Aug 2010 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·