[foxboro] Relocating Workstations
- From: "Jones, Charles R. (Chuck)" <Chuck.Jones@xxxxxxxxxxxxxxx>
- To: "'foxboro@xxxxxxxxxxxxx'" <foxboro@xxxxxxxxxxxxx>
- Date: Tue, 4 Jan 2005 14:21:16 -0600
Greetings All,
I have a situation for which I have not yet found a solution. I had to swap
the locations of two machines within the same control room. There are five
workstations on the local node. The AP is in the same room. All six are 51
series machines in a standard Industrial Enclosure. The cables are all
securely tie-wrapped in place for protection in the event of nuclear blasts
or tectonic plate shifts. So, it was easier to power down and move the two
boxes in the racks. (I also swapped their annunciator panels.) I found out
(on the second attempt), if I change the letterbug on the DNBI, they will
even come back up with the correct identity. Almost everything came back up
and ran fine.
The problem is that we have several in-house applications that run on the
AP. The operating displays for these functions reside on the AP and are
called up from any of the attached workstations and run from there. They
continue to work for all of the stations except the two that were swapped.
The swapped workstations can ping and be pinged. The graphs on the swapped
stations display fully populated with historical data, so that particular
connection to the AP is established. But, the in-house applications will
not run from the swapped stations. I checked one of the graphics in
question to find the command line information that was passed via dmcmd
script. It was simply:
/path/ApplicationName GCLBUG &
So, I got on the AP console, went to the appropriate directory, and typed in
the command. I could not force the display to appear that way, either. (I
can, however, get this to work on any of the unaffected machines.) I
checked the log file created by the application and could see that it was
working in the background, had populated the shared variables for the
display (that didn't come up), and was waiting for a user response from the
screen.
By the way, I have also rebooted the AP. I didn't think it would help, but
I knew it wouldn't hurt either.
So at this point, the problem appears to be that the letterbug designation
is not functioning as I expect for the two affected machines. I can't
believe that I am the only one to have swapped the locations of workstation
within the same control room. Perhaps someone has sweated out the answer to
this problem before. I believe I've ruled out Link-Layer, Network Layer, and
Transport Layer problems. Application Layer problems have their
documentation so spread out that it is daunting to even guess where to look.
Does anyone know why I cannot get this to work?
Chuck Jones
Refinery Automation Technologist
Tate & Lyle -- Lafayette South Plant
765.477.5324 - Office | 877.536.9219 - Pager
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