EPICS Home

Experimental Physics and Industrial Control System


 
1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  <20172018  2019  2020  2021  2022  2023  2024  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  <20172018  2019  2020  2021  2022  2023  2024 
<== Date ==> <== Thread ==>

Subject: Re: Automatic refresh of OPI
From: Andrew Johnson <[email protected]>
To: Iain Marcuson <[email protected]>, EPICS Tech Talk <[email protected]>
Date: Tue, 12 Sep 2017 11:33:24 -0500
On 09/12/2017 11:19 AM, Iain Marcuson wrote:
>>
>> Is this a situation where those PVs can be updated from either the GUI or the
>> back-end hardware? There are techniques people have developed to handle
>> this correctly if it is.
> 
> The PVs are divided into the "Getters" and "Setters".  The backend-variables
> can be set in hardware independently of EPICS.  The Getters have their OUT
> fields pointed at the Setters.

Great, adding a PP flag to the Getters' OUT fields would cause them to
process the setter records whenever they write a new value, which will
trigger a CA event automatically so you won't need the GUI Refresh. From
the earlier description of your fourth (trigger) PV that should be safe
to do and wouldn't cause a processing loop.

- Andrew

-- 
Arguing for surveillance because you have nothing to hide is no
different than making the claim, "I don't care about freedom of
speech because I have nothing to say." -- Edward Snowdon

References:
Automatic refresh of OPI Iain Marcuson
Re: Automatic refresh of OPI Kasemir, Kay
RE: Automatic refresh of OPI Iain Marcuson
Re: Automatic refresh of OPI Andrew Johnson
RE: Automatic refresh of OPI Iain Marcuson

Navigate by Date:
Prev: RE: Automatic refresh of OPI Iain Marcuson
Next: MEDM display of string records not updating from PCASpy/PyEpics keith.thorne
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  <20172018  2019  2020  2021  2022  2023  2024 
Navigate by Thread:
Prev: RE: Automatic refresh of OPI Iain Marcuson
Next: Cannot communicate with S7-400 Antal, Szabolcs
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  <20172018  2019  2020  2021  2022  2023  2024