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<== Date ==> | <== Thread ==> |
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Subject: | RE: LabVIEW EPICS connection |
From: | <[email protected]> |
To: | <[email protected]>, <[email protected]> |
Date: | Fri, 29 Jun 2012 10:42:08 +0000 |
Hi Steve, It would be good to have a well working CA integration in LabVIEW, I agree –but it’s been several years since NI started talking about this and it’s still only
sort of halfway working. The 3rd party alternatives (in particular CA Lab) works so well that it really doesn’t matter (to us anyway). Regarding the URL detail: apologies I don’t remember that level of detail today – and the computer with that LabVIEW/DSC installation has been replaced ages
ago so I can’t even check it now. Cheers, Ulrik From: Steve Kinder [mailto:[email protected]]
Hi Ulrik Thanks for the reply. Yes I had seen that exchange. It was a while ago and not the same thing I have installed although I suspect actually the same contents. I
also wasn’t quite sure how that ended up. I agree with the general points you make regarding the add-on. It is interesting, and may well be important for me to know, that the array/waveform didn’t work.
I am verging on trying CA Lab for sure. It would still be good to get the LabVIEW add-on working. I know it was some time ago but do you remember what you used for the URL in for the Create EPICS Client
VI? Cheers Steve From:
[email protected] Sent: Thursday, June 28, 2012 11:26 AM Subject: RE: LabVIEW EPICS connection Hi Steve, A while ago (a couple of years) I went through this process and tried out a few different EPICS-LabVIEW integration libraries. My first choice was also this
NI supplied LabVIEW add-on. However, I had trouble getting this working well: ·
There is a significant lack of documentation even to help you get started, let alone to understand how it does Channel Access I/O. ·
I have had some trouble to get the add-on installed and working – and others have reported the same. See
http://www.aps.anl.gov/epics/tech-talk/2010/msg00277.php ·
Once running I found that I couldn’t get array/waveform to work (possibly not supported at all) ·
Setting up shared variables is far too complicated for some of our novice LabVIEW users I had a lot better experience with the CA Lab library
http://www-csr.bessy.de/control/SoftDist/CA_Lab/ This worked straight out of the box for me and the documentation is excellent to get you started. Also it uses the native EPICS ca and Com libraries
and makes the source code available so you can understand how it really works. I recommend going with that for any new project. Cheers, Ulrik From:
[email protected] [mailto:[email protected]]
On Behalf Of Steve Kinder I am trying to connect an existing LabVIEW VI to EPICS via the freely available LabVIEW add-on EPICS Client I/O Server (http://joule.ni.com/nidu/cds/view/p/id/2533/lang/en).
I am running LabVIEW 2011 and have a 3-14-11 soft IOC running on the same system with a few test PVs. My first aim is to make a connection between these PVs and elements of the LabVIEW VI (currently just a test VI). I wondered whether anyone had successfully
used this LabVIEW add-on or the full version as in the DSC/RT add-ons and could offer me advice on how to make the connection. I have the following in my test LabVIEW VI; Create EPICS VI, Deploy EPICS Client VI and List Records VI. I was hoping that the latter would display a list of records
in my soft IOC if the connection had been established. I get no errors but it doesn’t seem to display any records. Any advice would be appreciated, perhaps including whether I should be trying to use this LabVIEW add-on or one of the other options e.g. CA Lab or the Oak Ridge
CA client. Many Thanks Steve |