Re: [EXTERNAL] phoebus Tank widget: Limits from PV?

[Paul Sichta via Tech-talk <tech-talk at aps.anl.gov>]

Kay,

Thanks for those tips.  My database file has LOPR/HOPR as -140/160,  but after the IOC is running the LOPR/HOPR are written with new values, e.g. -100/500.

When I use the caget command,  the display limits show -100/500.

When I probe the tank widget (PV)  in phoebus it shows, in the metadata section,  display range of -140/160,  and when I look carefully on the tank widget scale it also shows -140/160  range for the case where I checkbox to use the PV Limits - so the PV Limits checkbox is working, but ....

How in the heck does phoebus know what the loaded database limits were,  rather than reading the PV's current values?  Is there a cache where it is read by phoebus one time or upon initial connection?  I tried restarting phoebus but it always thinks the display limits are the loaded database's -140/160.

Regards,

-ps

On Wed, Jul 5, 2023 at 2:31 PM Kasemir, Kay <kasemirk at ornl.gov> wrote:

When I try it with this type of record, tank & meter & progress bar all get the 0..10 range from the record:

 

record(calc, "ramp")

{

   field(SCAN, "1 second")

   field(INPA, "ramp")

   field(CALC, "A<10?A+1:0")

   field(HOPR, "10")

   field(LOPR, "0")

}

 

In “probe” you should also see “Display Range: 0.0 .. 10.0”, and from a command line `caget -d CTRL_DOUBLE ramp` should show the same Lo and Hi disp limit.

 

 

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Paul Sichta via Tech-talk <tech-talk at aps.anl.gov>
Date: Wednesday, July 5, 2023 at 1:51 PM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: [EXTERNAL] phoebus Tank widget: Limits from PV?

Hello, 

I have used  the checkbox to select "Limits from PV'' which I expected would be taken from  LOPR and HOPR of the PV.  That checkbox seems to make no difference;  the tank's range is always the Minimum and Maximum values used for the widget's properties.  I see the same ignoring of PV limits for the meter and progress bar.

 

I'm using channel access for the PV's ,  and version master 2023-06-28 04:51,  but some earlier versions I have do the same thing.

 

Regards,

-ps