[foxboro] FoxAPI Broadcast (was RE: FOXAPI BROADCAST)
- From: "Johnson, Alex (Foxboro)" <ajohnson@xxxxxxxxxxx>
- To: Edy_Kurniawan@xxxxxxx, techsupport@xxxxxxxxxxx,"FitzGerrell, Kevin Shope" <kevin.fitzgerrell@xxxxxxxxxxxx>
- Date: Mon, 6 Oct 2003 18:15:34 -0400
FoxAPI will not broadcast - after the first time - if you are using =
V4.2.5
or later.
It adds the tag's top level name (compound) to the IMPORT table on the
machine. Any subsequent accesses will go to the CP that holds the data =
and
only that CP.
However, you should be aware that this is a relatively slow process
(one-shot gets) and you cannot expect to do this for very many values =
per
second. Eventually, you will overload the CP and lose messages.
Depending on what is being done on your system, you may need to =
increase the
size of the IMPORT table. You can check on the available space in the =
IMPORT
table by issuing the following command:
/usr/local/show_params
If you are running low on free entries in the IMPORT table, contact TAC =
for
instructions on how to increase it.
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: Edy_Kurniawan@xxxxxxx [mailto:Edy_Kurniawan@xxxxxxx]=20
Sent: Monday, October 06, 2003 4:39 PM
To: techsupport@xxxxxxxxxxx; kevin.fitzgerrell@xxxxxxxxxxxx
Cc: ajohnson@xxxxxxxxxxx; foxboro@xxxxxxxxxxxxx; Csys_Admin@xxxxxxx
Subject: FOXAPI BROADCAST
Importance: High
Dear all,
The PI could retrieve string value from Foxboro DCS' tag(please refer
attached Mr. Kevin's email),=20
it succesfully done with give the location2 at PI tag configuration =
with 0
(zero) value.
Is it true that if we use this configuration it will make FOXAPI =
BROADCAST
and increase the network traffic , significantly ?
Please help us, about this issue.
best regards,
=E9dy kurniawan
Industrial Automation System Engineer
Freeport Indonesia Co.
Ref :
From: kevin.fitzgerrell@xxxxxxxxxxxx
[mailto:kevin.fitzgerrell@xxxxxxxxxxxx]
Sent: Wednesday, July 02, 2003 5:07 AM
To: TechSupport@xxxxxxxxxxx
Cc: ajohnson@xxxxxxxxxxx; craig@xxxxxxxxxxxxxx; Kurniawan, Edy
Subject: RE: String Value Not Available for PI Tag
FoxAPI supports unbuffered string reads and writes with the sread and
swrite. These are not handled in object manager lists (sets opened =
with
scopen) however.
Regards,
Kevin FitzGerrell
Systems Engineer
Foxboro New Zealand
------------------------------------
Tel: +64 (9) 573 7690
Fax: +64 (9) 573 7691
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