Experimental Physics and
Industrial Control System

"Shepherd, EL (Emma)" <[email protected]> · Thu, 4 Sep 2008 22:30:57 +0100

Hi Andrew,

Thanks for the reply; yes sseq is part of the synApps package (we use it
so regularly I sometimes forget it isn't in base!).

Actually the link is listed as being connected, and in fact it does
update properly when the record is processed or when the value of the
linked record changes.  The difference in behaviour between vxWorks and
Linux is just concerning initialisation - on vxWorks the link gets
processed when the IOC first boots up but on Linux it doesn't.

Emma

> -----Original Message-----
> From: Andrew Johnson [mailto:[email protected]] 
> Sent: 04 September 2008 21:04
> To: [email protected]
> Cc: Shepherd, EL (Emma)
> Subject: Re: sseq link problem on Linux
> 
> 
> Hi Emma,
> 
> On Thursday 04 September 2008 13:46:58 Shepherd, EL (Emma) wrote:
> >
> > I recently encountered an interesting problem when moving 
> an IOC from 
> > vxWorks to Linux (RedHat).  The database contains a number of sseq 
> > records with CP input links to pull across some data from 
> another IOC. 
> > This happens whenever one of the links changes, but also 
> when the IOC 
> > boots up for the first time.  This worked fine on vxWorks, but on 
> > Linux the links do not get updated when the IOC boots up.  It's not 
> > just an occasional failure, it just never worked.  I 
> changed the sseq 
> > records to transforms and it now works fine.  In both cases I had 
> > PINI=YES.
> 
> Hmm, I would guess the the sseq record type is from synApps.  
> However assuming 
> that it's just using a standard dbCa link, what does "dbcar 
> '', 1" show from 
> one of the Linux IOCs where the link is not being updated?  
> Does it list that 
> record link as disconnected?
> 
> - Andrew
> -- 
> Talk is cheap. Show me the code. -- Linus Torvalds
> 
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System