Re: [foxboro] Station block parameters - OMSCAN I/A 8.7-ZCP270

  • From: <Martin.Theobald@xxxxxxxxxxxxxx>
  • To: <foxboro@xxxxxxxxxxxxx>
  • Date: Fri, 13 Feb 2015 14:12:51 +0000

Dirk,

Re: The OM Scanner load on a CP is driven by the other stations in your system. 
 Unfortunately, there is not much you can do at the CP to change this loading.

It might be worth reviewing the Input Deltas for the values that are being read 
by the other Control Stations.  If PI has deltas for the values being read it 
might be worth reviewing those as well.


Regards,

Martin Theobald

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On 
Behalf Of Terry Doucet
Sent: 13 February 2015 13:46
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Station block parameters - OMSCAN I/A 8.7-ZCP270

Attempt #2
From: doucet427@xxxxxxxxxxx
To: foxboro@xxxxxxxxxxxxx
Subject: RE: [foxboro] Station block parameters - OMSCAN  I/A 8.7-ZCP270
Date: Fri, 13 Feb 2015 08:42:48 -0500




Dirk,

The OM Scanner load on a CP is driven by the other stations in your system.  
Unfortunately, there is not much you can do at the CP to change this loading.   
I presume you are running 1/2 second BPC but perhaps you are running faster?

I am very surprised to see zero OM overruns with such a high OM Scan.    Could 
another application be re-setting the value to zero?

Open the om Scannner overlay and watch the scan at the various phases to see if 
it is evenly balanced at 10-12% for all phases or to get high peaks.  This 
might help you find out what OM load is demanding peaks.

You say that you slowed down OSI software scan to 2 seconds.   In the olden 
days a 2 second API scan could kill every CP on a network.  You are using CP270 
so  you get some grace here but I would try slowing it down even more.  At many 
sites, the normal API scan is 10 seconds.


Terry


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