Re: [foxboro] PAS- Alarm Management

Thanks Alex.
I understand that Invensys also supplies Alarm Management System using PAS 
systems. Is the OPC  method generally adopted by Invensys to make CP database 
change? In one of my earlier AMS  projects (not with PAS), I used  ICC driver 
task to make bulk changes to CP.


Regards
Pramod
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On 
Behalf Of Johnson, Alex P (IOM)
Sent: 22/May/2012 3:06 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] PAS- Alarm Management 

I spent some time with PAS working to ensure that their alarm management 
software used AIM*OPC appropriately. Basically, the OM is slow for one-shot 
gets of values and one-shot sets of values (a few (<10) per second).

We worked to minimize the number of one-shot gets by moving them to read lists. 
To minimize this impact, I recommend that the AIM*OPC DA Server be run on the 
AIM*Historian host machine since they will share OM lists though this may or 
may not be helpful depending on the other tags being monitored.

So, you must consider the loading impact on the CPs. Older CPs may not have the 
capacity to support this application; CP270s typically will not have issues, 
but you need to check even in that case. 

To determine the loading impact, you will need to work with PAS to determine 
the increase in load. Loading factors include:
 1) The number of parameters monitored using read lists
 2) Update rate for the read lists
 3) The number of parameters acquired using one-shot operations
 4) Update rate for the one-shot operations

We have CP sizing spreadsheets that can be used to help model the impact based 
on this data and they are available from the Global Client Support folks 
(http://support.ips.invensys.com).

All in all, it's not whether or not their software works. The question is how 
well does it work within the restrictions of an I/A Series system. You will 
have this issue regardless of vendor so do your homework.

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 1700 (Central Fax)
alex.johnson@xxxxxxxxxxxx 

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On 
Behalf Of Pramod Kumar
Sent: Tuesday, May 22, 2012 11:45 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] PAS- Alarm Management 

 Hi list,
Any one tried AIM OPC to make changes in CP database. Alarm management vendor 
PAS proposes to use this method to make CP database changes resulted after 
alarm rationalization study. 

Regards
Pramod
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