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  2017  2018  <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  2017  2018  <2019>  2020  2021  2022  2023  2024 
<== Date ==> <== Thread ==>
Subject: Re: [EXTERNAL] CSS jython setvalue behaviour
From: "Kasemir, Kay via Tech-talk" <[email protected]>
To: Pilar <[email protected]>
Cc: "[email protected]" <[email protected]>
Date: Thu, 12 Sep 2019 13:49:40 +0000 
>  And if I want to use a PV defined in the database? What can I use?

When you connect to a Channel Access PV, you get the type that Channel Access reports.
You cannot change it.
For an analog input record, you get VDouble.
When you connect to the RVAL field, you get VInt.

The exact details of local PV handling differ depending on using
 * vtype.PV with Eclipse-based BOY
 * PVManager with Eclipse-based BOY
 * The latest CS-Studio, i.e. the Display Builder under Phoebus

In the latter, when I use  "loc://num(0)" it defaults to a VDouble.
A script can write 2147483649 (= 0x80000001) to that variable without loss.
I can also use loc://num<VLong>(0) to force a double type, again written without loss.
loc://num<VInt>(0) wasn't supported, just added that, and it truncates when you write something larger than 0x7fffffff (shows up as negative).

-Kay
Replies:
Re: [EXTERNAL] CSS jython setvalue behaviour Pilar Gil via Tech-talk
References:
CSS jython setvalue behaviour Pilar via Tech-talk
Re: [EXTERNAL] CSS jython setvalue behaviour Kasemir, Kay via Tech-talk
Re: [EXTERNAL] CSS jython setvalue behaviour Pilar Gil via Tech-talk
Re: [EXTERNAL] CSS jython setvalue behaviour Kasemir, Kay via Tech-talk
Re: [EXTERNAL] CSS jython setvalue behaviour Pilar Gil via Tech-talk
Re: [EXTERNAL] CSS jython setvalue behaviour Kasemir, Kay via Tech-talk
Re: [EXTERNAL] CSS jython setvalue behaviour Pilar via Tech-talk
Navigate by Date:
Prev: Re: [EXTERNAL] CSS jython setvalue behaviour Pilar via Tech-talk
Next: Re: [EXTERNAL] CSS jython setvalue behaviour Pilar Gil via Tech-talk
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  <2019>  2020  2021  2022  2023  2024 
Navigate by Thread:
Prev: Re: [EXTERNAL] CSS jython setvalue behaviour Pilar via Tech-talk
Next: Re: [EXTERNAL] CSS jython setvalue behaviour Pilar Gil via Tech-talk
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  <2019>  2020  2021  2022  2023  2024