Some years ago I had to send and receive data from a linux box to
Foxboro object manager variables. The program was done as an RPC
client/server program and could handle 100 points at a time.
I also ran into the number of broadcasts generated so I used a system
that keeps an in-memory database of the pointers to the actual OM
variables.
If the point is not in the in-memory database then it broadcasts for it
and puts the pointer into the database. The size of the database is
configurable at startup and uses shared memory.
I did not want to use OM lists as some of our CP's are heavily loaded
with regard to this.
The code works for Linux->Foxboro Sun, Sun->Foxboro Sun.
I have also used it for out Intranet to display variables as well.
The code is not particularly pretty and could use a bit of a tidy up. I
don't believe that my organisation would mind releasing it if somebody
else wanted it.
There is also a program to retrieve historian data from a shell script.
I also use this for Intranet access to historian data.
--
Darryl Bond
NRG Gladstone Operating Services Pty Ltd ( Gladstone Power Station )
[email: [EMAIL PROTECTED]] [voice: (07) 49 765756] [fax: (07) 49
765100]
snail: PO Box 5046 Gladstone 4680 Queensland , Australia
>----------
>From: Murray, Steve[SMTP:[EMAIL PROTECTED]]
>Reply To: Foxboro DCS Mail List
>Sent: Wednesday, 15 March 2000 5:30
>To: 'Foxboro DCS Mail List'
>Subject: RE: Browser access to Foxboro graphics.
>Hi Alex,
>� Thanks for the additional information on broadcasts.� I guess the reason
> it works ok on my system is that I have only one node, three CP40s, and
> two gateways.
>Stephen Murray
> -----Original Message-----
> From: Johnson,Alex [ mailto:[EMAIL PROTECTED]]
> So, in a nutshell, be cautious in the use of 'omget' and
> 'omset' and do not
> assume that they will meet the need in all cases on all systems (esp.
> multi-node systems).
>
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