Re: Remote I/O

[Wesley Moore <wmoore@jlab.org>]

Paul Hamadyk wrote:
> On Thu, 2009-12-17 at 09:07 -0500, Wesley Moore wrote:
>
>   
> > I'm using the CJ1's as well paired with the ETN21 Ethernet module.  I 
> > believe one I'm using has the built in Ethernet but it's basically the 
> > same.  The Ethernet driver uses the FINS protocol.  I can read/write 
> > bits or words to the PLC.  The memory areas I read/write to are DM, CIO, 
> > WR, and HR.  I've found pretty quick that reading by word and splitting 
> > out the bits to individual bi and bo's was the way to go.  Much faster 
> > that way.  I've got the driver working in EPICS 3.13 and 3.14.
> >
> >
> > Wesley
> >     
>
> I will be making a streams protocol file for FINS/UDP, using asyn's
> UDP/IP for the request and UDP/IP Server for the reply, if you're
> interested? Can you think of any advantages in using your Ethernet
> driver?
>
> We tend to use Data Memory (DM) with a bit of Core IO (CIO) and
> Auxiliary Registers (AR) for PLC status and error information.
>
> Paul.
>   
Paul,
   I'd be interested in using that at a later date.  The biggest part 
of why I went the driver route was that I started with one from KEK.  
The driver didn't work out of the box, parts of the FINS protocol were 
hard coded and some data types didn't work.  One thing to be mindful of 
is the Gateway Counter.  It's set to 2 or 7 I believe.  Either way, the 
EPICS side just has to match.  As far as memory areas, I use the HR area 
for interlocks that need to hold through a power cycle. 

Wesley

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