Re: [foxboro] OPC Server Objects
- From: "Johnson, Alex (Foxboro)" <ajohnson@xxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Tue, 13 Jan 2004 14:11:45 -0500
I'd turn in a CAR. There is work being done on the OPC Server and your CAR
might be timely.
Regards,
Alex Johnson
Invensys Systems, Inc.
10707 Haddington
Houston, TX 77043
713.722.2859 (office)
713.722.2700 (switchboard)
713.932.0222 (fax)
ajohnson@xxxxxxxxxxx
For the latest information on ArchestrA, go to
www.invensys.com/Archestra.html.
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Ken Heywood
Sent: Tuesday, January 13, 2004 12:06 PM
To: Foxboro Freelist (E-mail)
Subject: Re: [foxboro] OPC Server Objects
To further the subject thread, I think I may have found something ... when I
browse the I/A blocks, the Matrikon browser lists the available parameters
for the block type of the block selected. This is the same list I see when
building historian or configuring a graphic display. I suppose the list
comes out of CSA (pdef maybe?). I found that the gateway blocks I'm using,
SAIN and SDIN, have many parameters listed, but a key few are missing ...
like how about MEAS and CIN_1 (etc)? Now, I'm not going to ask how or why
valid and important parameters were taken out of the CSA parameter list but
I am supposing this maybe the root of my OPC problem. I can manually enter
the path and get a good value on the client. However, when a remote client
process uses an alias to access the value, the connection fails. I can only
guess that OPC Server attempts to resolve the path of an alias by doing a
lookup on CSA for block type and parameters. If the path is not established
because the parameter is not on the list, no OPC client can access the
value.
So, now what to do to even have a prayer for getting some IT apps running
with apps using OPC access? Anybody know how to 'fix' CSA?
* K
-----Original Message-----
From: Ken Heywood
Sent: Monday, January 12, 2004 8:58 AM
To: Foxboro Freelist (E-mail)
Subject: OPC Server Objects
So far, you OPC experts are batting 1000. Hope you can help me with this
next 'gotcha' ... I can create an item to access an object in I/A with the
Matrikon client, for argument's sake, call it
SERVER1\COMPOUND1:BLOCK1.CIN_1. I do this using the browser, so I know that
AIM*API can access the point. I get a good value and the quality status is
'good' on display.
Now, I try to create an item using the browser to pick the AIM*OPC alias
that was pre-configured to point to the same I/A object and the point
displays a wrong value and the quality status is "Bad, out of service".
What am I missing here? Help!
* K
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