Re: [foxboro] Accum Block Reset
- From: "Johnson, Alex P (IPS)" <alex.johnson@xxxxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Mon, 16 Feb 2009 14:54:42 -0500
Of course, you could hardwire them. That will tie them to within a block scan.
The peer-to-peer suggestion using 3 CPs should be roughly the same order of
magnitude of error. If you connect the Master signal to the slaves, the OM in
the master will send it out in about 0.25s (average). The receiving CPs will
process the message straightaway (subject to loading issues) so that the block
will see it on its next scan.
Regards,
Alex Johnson
Invensys Process Systems
10900 Equity Drive
Houston, TX 77041
713 329 8472 (desk)
713 329 1600 (operator)
713 329 1944 (SSC Fax)
713 329 1700 (Central Fax)
alex.johnson@xxxxxxxxxxxxxxxx
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Bakker, René
Sent: Monday, February 16, 2009 11:54 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Accum Block Reset
Terry is right.
As long as you have the two CP's look at the "HOUR" parameter independently,
you will be stuck with a max 2 second difference.
Have only one CP (can be a third CP)look at the "HOUR" and set some bit
accordingly and let both ACCUMs look at that bit instead and you're in business.
Regards,
René Bakker - EMEATAC - Invensys Systems - Baarn - the Netherlands
Subject: Re: [foxboro] Accum Block Reset
Date: Mon, 16 Feb 2009 12:09:36 -0500
From: tdoucet@xxxxxxxxxxxxxxxxxx
To: foxboro@xxxxxxxxxxxxx
Brian,
The Master Timekeeper is supposed to keep the internal clocks of all stations
(including CP's) within +-1 second, previous to V8. So your two CP's (worst
case) could be almost 2 seconds difference. This is the best resolution you
should expect to see.
If that is acceptable, then you can try the period phase items, below. But
remember that you need a 1/2 second or at worst 1 second period.
Check to see if you have OM_Scanner overruns on both CP's
Terry Doucet, Eng.
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and any associated files may be confidential and further may be legally
privileged. This email is from the Invensys Process Systems business unit of
Invensys plc which is a company registered in England and Wales with its
registered office at Portland House, Bressenden Place, London, SW1E 5BF
(Registered number 166023). For a list of European legal entities within the
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If you have received this e-mail in error, you are on notice of its status.
Please notify us immediately by reply e-mail and then delete this message from
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and any attachments thereto may be subject to the terms of any agreements
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