Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Tue, 1 Sep 2015 16:49:56 -0500

On 09/01/2015 12:13 AM, Deepika Thakur wrote:
> Hello,
> IOC behaves normally when I do caget. Data from device support  gets
> printed when I run IOC. Just when I do caget to read OPTO card data it
> gives zero value as shown below.Also GUI I have prepared in CSS BOY also
> show disconnected PVs 
> 
> [srk@srk iocmyExample]$ caget wafData
> wafData 72 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0
> 
> When I do caget to read ADC card data I get VIRTUAL CIRCUIT DISCONNECT
> warning as described in previous post.
> There are as such no other symptoms apart from this

Did you or someone at your site write the devices support for the ADC
card? I don't think it (or some other device support in your IOC) is
working properly, but unless you tell us a lot more information about
the IOC (what OS is it running on, what hardware is connected to it,
where did the ADC device support come from, what version of EPICS Base
you are using, show us all the messages that appear as the IOC boots up,
etc.) I don't think the community will be able to help you fix this.

Do you have access to anyone else locally with more EPICS expertise? I
can't spend the amount of time I think this might need to help you over
email. If you are part of the ITER project you should use the ITER
technical support channels to help you.

- Andrew

> On Mon, Aug 31, 2015 at 8:38 AM, Andrew Johnson <[email protected]
> <mailto:[email protected]>> wrote:
> 
>     Hi,
> 
>     On 08/31/2015 01:08 AM, Deepika Thakur wrote:
>     > The server is an IOC.
>     >  When I run IOC , sometimes it gives warning as
>     >
>     >
>     > cas warning: Configured TCP port was unavailable.
>     > cas warning: Using dynamically assigned TCP port 54834,
>     > cas warning: but now two or more servers share the same UDP port.
>     > cas warning: Depending on your IP kernel this server may not be
>     > cas warning: reachable with UDP unicast (a host's IP in EPICS_CA_ADDR_LIST)
> 
>     You can ignore that warning as long as your CA clients are all on the
>     same IP subnet as the server. If you have problems with them connecting
>     to the IOC, you should read this Wiki page:
> 
>     https://wiki-ext.aps.anl.gov/epics/index.php/How_to_Make_Channel_Access_Reach_Multiple_Soft_IOCs_on_a_Linux_Host
> 
>     However the problem you described before is completely unrelated to the
>     above warning.
> 
>     Does the IOC continue running and otherwise behave normally when you do
>     the caget? I suspect there are other symptoms which you have not yet
>     described.
> 
>     - Andrew
> 
> 
>     > On Fri, Aug 28, 2015 at 8:18 AM, Andrew Johnson <[email protected] <mailto:[email protected]>
>     > <mailto:[email protected] <mailto:[email protected]>>> wrote:
>     >
>     >     Hi,
>     >
>     >     On 08/27/2015 11:31 PM, Deepika Thakur wrote:
>     >     > Please guide how to resolve this following "VIrtual Circuit
>     Disconnect "
>     >     > warning :
>     >     >
>     >     >
>     >     > [srk@srk iocmyExample]$ caget ADC_CARD:CHANNEL1-16:ADCData
>     >     > Read operation timed out: some PV data was not read.
>     >     > ADC_CARD:CHANNEL1-16:ADCData 72 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>     0 0 0 0 0 0
>     >     > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>     0 0 0 0 0 0
>     >     > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>     >     >
>     CA.Client.Exception...............................................
>     >     >     Warning: "Virtual circuit disconnect"
>     >     >     Context: "op=0, channel=ADC_CARD:CHANNEL1-16:ADCData,
>     >     > type=DBR_TIME_CHAR, count=72, ctx="localhost:5064""
>     >     >     Source File: ../getCopy.cpp line 92
>     >     >     Current Time: Fri Aug 28 2015 09:52:41.966386036
>     >     >
>     ..................................................................
>     >
>     >     That message usually means that the IOC or CA server died
>     before the
>     >     client could disconnect from it properly; it is very unusual
>     for caget
>     >     to show this message, but should be benign. Is the server an
>     IOC, or
>     >     something based on libcas?
>     >
>     >     - Andrew
> 
>     --
>     Light thinks it travels faster than anything but it is wrong.
>     No matter how fast light travels, it finds the darkness has
>     always got there first, and is waiting for it.
>         -- Terry Pratchett, Reaper Man
> 
> 

-- 
Light thinks it travels faster than anything but it is wrong.
No matter how fast light travels, it finds the darkness has
always got there first, and is waiting for it.
    -- Terry Pratchett, Reaper Man

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System