Re: [foxboro] [I] Re: Wrting data from PI server to Foxboro IAS blocks, OPCInt <<==>> AIM OPC DA
- From: "Johnson, Alex P (IOM)" <Alex.Johnson@xxxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Mon, 10 Oct 2011 11:21:19 -0500
One comment.
Fxbais "pushes" data into the blocks using "one-shot" calls. This is not very
efficient and it is very slow if you have significant data to move.
The better approach is to stage the date in OM variables local to the fxbais
process (on the AW) since the "one-shot" is very fast in that case. These local
OM variables should then be connected to the input parameter of the block.
This makes a "read" connection from the AW to the CP and that is very fast and
efficient.
There are two types of "local" OM variables available to you:
1) Shared Variables
2) I/A Series Application Objects
Shared Variables are free and can be created at boot-up using omcrt or ommcrt.
The limitation of note is that the name is only 14 characters long and they do
not have parameters.
Application Objects like SVs reside in the AW's memory, but have a three part
name. The advantage of this is that it is easy to create generic displays to
view the data in the AOs.
AOS is sold (Q0301JC). Shared Variables are included in the base software.
I strongly recommend this approach if you have 100+ values to move into the CP.
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)
alex.johnson@xxxxxxxxxxxx
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Liptock, Sheri A
Sent: Monday, October 10, 2011 5:00 PM
To: 'foxboro@xxxxxxxxxxxxx'
Subject: Re: [foxboro] [I] Re: Wrting data from PI server to Foxboro IAS
blocks, OPCInt <<==>> AIM OPC DA
Leo, I write to IA 2 ways from OPC.
1. Same as what Ted suggested: from OPC server, use OPC-DA PI interface to
send (write) the instruments' values to a PI server. Then PI server processes
(via ACE) these instruments' values. Then PI server sends (writes) newly
calculated values via fxbais (which uses foxapi) to IA blocks (Booleans,
string, etc).
2. From OPC server directly to IA RIN blocks using FDSI-FBM.
Since neither of these is exactly as you planned, do you want more info about
either? Please let me know.
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Ted Jirik
Sent: Sunday, October 09, 2011 12:36 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [I] Re: [foxboro] Wrting data from PI server to Foxboro IAS blocks,
OPCInt <<==>> AIM OPC DA
Leo,
OSI has a very nice interface for IA called fxbais that does not use OPC. It
uses foxapi. It does read/write access to IA very reliably and eliminates all
the OPC configuration steps.
It is a lot easier to setup.
Ted Jirik
On Oct 9, 2011, at 3:25 AM, Leonardo Mercado wrote:
> Good morning all,
>
> I'll ask this question once again, I need to allow data write to foxboro IAS
> blocks.
> The aim is to exchange data from one PI server using PI-OPCInt to OPC DA
> Server on IAS Mesh network, then OPC DA server write those data to
> Foxboro IAS block
> Does any one have a typical configuration on all parties (PI, OPC DA
> configurator, aimapi.cfg, security issues like
> read/write permissions.......etc)
> Data flow from PI to OPC server is open, tested using apisnap utilities
>
>
> Thanks
>
> Leo
> Instrument Supevisor
>
>
>
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