Re: [foxboro] alarm time stamp issue
- From: "Johnson, Alex P (IOM)" <Alex.Johnson@xxxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Fri, 5 Mar 2010 11:28:17 -0600
I can confirm that all Y2K compliant releases have the time stamp stored with
the message when the Compound(Block) Processor detects the alarm.
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 (current)
alex.johnson@xxxxxxxxxxxxxxxx (good until September 2010)
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Johnson, Alex P (IOM)
Sent: Thursday, March 04, 2010 9:27 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] alarm time stamp issue
AIM*Historian records alarms in the order that it receives them.
The CP sends alarms in the order that it detects them.
The CP detects alarms in the order that it processes the blocks.
If I recall correctly, the time stamp is applied at the time the alarm is
detected.
The resolution of the time stamp is to the tenth of a second, but the tenth
doesn't show up in the time stamp field. It's in a field called "tenths." You
should be able to see that in the AIM*Historian database using AIM*Inform or
histspy.
So, if AIM*Historian has it recorded first, it should be the alarm that was
detected first, but this doesn't mean that it actually happened first. All of
the I/O is read at the same time (for blocks in the same period and phase), so
the order represents block order more than it does actual time of the change.
The SOE software loaded into discrete FBMs time stamps at the I/O card and
provides 1ms resolution and accuracy.
If you don't use the SOE functionality, the only conclusion that you can derive
is that the values changed within the same block scan interval.
Sorry.
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 (current)
alex.johnson@xxxxxxxxxxxxxxxx (good until September 2010)
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Ainuddin Ali
Sent: Thursday, March 04, 2010 8:47 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] alarm time stamp issue
hi list
we're on IA 7.1.1 windows. so we've no SOE feature. only alarm is displayed.
we're in the midst of troubleshooting why our main cooling water pump
tripped.
when we go through the alarm historian.. we've 2 alarms triggered at same
timestamp
21-feb-10 21:12:05 - LUBE WTR PUMP TRIPPED
21-feb-10 21:12:05 - LUBE WTR PUMP LOW DP
how shld we treat the alarm list since both having same timestamp. does IA
system works on "polling" method or "exception" method? shld we assume the
pump tripped first then subsequently low DP alarm triggered? in the logics
the pump can trip due to low DP. so we are puzzled which 1 comes first.
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Systems (formerly The Foxboro Company). Use the info you obtain here at
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*** Confidentiality Notice: This e-mail, including any associated or attached
files, is intended solely for the individual or entity to which it is
addressed. This e-mail is confidential and may well also be legally privileged.
If you have received it in error, you are on notice of its status. Please
notify the sender immediately by reply e-mail and then delete this message from
your system. Please do not copy it or use it for any purposes, or disclose its
contents to any other person. This email comes from a division of the Invensys
Group, owned by 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 Invensys Group, please go to
http://www.invensys.com/legal/default.asp?top_nav_id=77&nav_id=80&prev_id=77.
You may contact Invensys plc on +44 (0)20 7821 3848 or e-mail
inet.hqhelpdesk@xxxxxxxxxxxxx This e-mail and any attachments thereto may be
subject to the terms of any agreements between Invensys (and/or its
subsidiaries and affiliates) and the recipient (and/or its subsidiaries and
affiliates).
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
foxboro mailing list: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
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