Re: [foxboro] PI connection type
- From: <G.Macdonald@xxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 24 Mar 2010 16:05:10 -0600
Thanks for all the advice and suggestions. We were able to get it to work.
You have to add all the write points to the alias.cfg file. If any point is
set as write (location3=-3) and is not in the alias.cfg file
(d:\opt\fox\ais\bin\alias.cfg), then every point on that interface is
flat-lined.
Grant Macdonald
DCS / SIS Specialist
Scotford Refinery
Shell Canada Limited
Bag 23, Fort Saskatchewan, Alberta T8L 3T2, Canada
Tel: + 1 780 992 3881
Email: g.macdonald@xxxxxxxxx
Internet: http://www.shell.ca
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-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of Johnson, Alex P (IOM)
Sent: March 24, 2010 2:03 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] PI connection type
Re: Tim wrote, "Did you put all the writes in a separate list? You must put
the writes in a separate list, or you'll have all kinds of problems."
The I/A Series OM supports:
1) Read lists (read only lists of points)
2) Write lists (write only lists of points)
3) Read/write lists (tags can be read and/or written)
FoxAPI supports:
1) Read only data sets (mapped to ro om lists)
2) Read/write data sets (mapped to the r/w om lists)
The interesting thing about write lists is that if any point is unavailable,
e.g., a mispelled tag, all of the points are unavailable. The thinking was that
this would be a good feature for APC programs.
The even more interesting thing about R/W lists (and, therefore, FoxAPI R/W
datasets) is that if any point is unavailable ALL of the points are unavailable
for both read and write operations.
Yes, I agree that is strange, but that's the way it works.
My advice?
Segregate the points you want to read from those that need to be written. If
the points on the write list fail to update, check for those that are missing.
Make sense?
Regards,
Alex Johnson
Invensys Operations Management
10900 Equity Drive
Houston, TX 77041
+1 713 329 8472 (desk)
+1 713 329 1600 (operator)
+1 713 329 1944 (SSC Fax)
+1 713 329 1700 (Central Fax)
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alex.johnson@xxxxxxxxxxxxxxxx (good until September 2010)
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