Re: [foxboro] Calculations IND block
- From: "Schouten, Frits JF" <Frits.Schouten@xxxxxxxxxxxx>
- To: "'foxboro@xxxxxxxxxxxxx'" <foxboro@xxxxxxxxxxxxx>
- Date: Tue, 7 May 2002 06:07:30 +1000
Hi Jef,
try to get complicated calculations in CALC or CALCA(my preference) Blocks.
The problem with sequence code is that every time an external reference is
made, it will stop until the next scan which, in your case, is 2 seconds
while CALC/CALCA block always run to completion.
Also, it's not a problem to have sequence code running at 0.5 or even 0.1
seconds (if the CP is set up for that) and have a relatively low "number of
statements per BPC".
It is far more economic to do lots of small chunks in stead of trying to do
a few big chunks at the time.
It is also likely to have many overruns when you have specified more
statements per BPC than it can handle.
Believe me, I've learned it the hard way.
I know this is not the solution you're after but I hope it helps you in
finding one.
Cheers,
Frits Schouten.
NZSteel.
-----Original Message-----
From: jdesaeve@xxxxxxxxxxx [mailto:jdesaeve@xxxxxxxxxxx]
Sent: Monday, 6 May 2002 20:56
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Calculations IND block
Hi,
I am writing sequence logic in IND blocks and using lots of datapoints from
other stations.
Using " include files" rather than using direct links to datapoints in
other stations, it takes a lot of time before calucations are done.
All blocks (for that specific project) have a period of 2 seconds but
calculations are not finished at all during that time period !
I would like to group all my blocks in one compound for that project .
How to speed up the calculations ?
Regards,
Jef Desaever
Du Pont Protein Technologies
Zwaanhofweg 1
8900 Ieper-Belgium
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