Re: [foxboro] Timer Question
- From: Kevin_Fitzgerrell@xxxxxxx
- To: foxboro@xxxxxxxxxxxxx
- Date: Tue, 9 Oct 2007 06:47:05 +0900
Ken,
While the TIM blocks are always processed, the next cycle is delayed if
overloaded. The timing on the TIM blocks depends on each block
executing in it's scheduled slot. So, although the TIM blocks are
always executed, the extra overrun slots in between the normal block
execution slots affects the timing. This also affects ACCUM blocks and
I believe CALC block timing (DON, DOFF, etc).
Kevin
-----Original Message-----
=46rom: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Moore, Kenneth, Celanese/US
Sent: Tuesday, October 09, 2007 6:31 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Timer Question
I'm looking at an old block book, but the last entry is a Note that
states:
"In a serious system overload, TIM blocks are always processed, even if
it delays the next BPC".
So if you seriously overloaded, every additional TIM block added to the
system extends the BPC.
Ken Moore
Celanese
Enoree SC
-----Original Message-----
=46rom: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Johnson, Alex P (IPS)
Sent: Monday, October 08, 2007 4:57 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Timer Question
Two suggestions:
1) Check for overruns
2) If no overruns, delete the "bad" block and duplicate a "good" one and
see if that works.
The most common problem cause is CP overruns. The TIMERS all work
assuming that the BPC never overruns. If you are seeing the timers
"double time" on your production system, it is almost certain that the
CP is over-running.
Call up the Station (<cplbug>_STA:STATION) block's detail display,
active the monitoring, and watch your overruns. I bet you have a lot of
them
If your "good" TIM is in the same CP as your "bad" TIM and there are no
overruns, and the configuration is identical, I'm stumped as to the
cause, but for the solution, I'd delete your "bad" one and use the ICC's
block copy to copy the good one and see if it still works.
The ICC's block copy facility is invoked by typing the path name to the
"good" block in the TYPE field of a block you are building.
NAME COPY_TIM
TYPE OTHER_CMPD:ORIG_TIM
Regards,
Alex Johnson
Invensys Systems, Inc.
10900 Equity Drive
Houston, TX 77041
713.329.8472 (voice)
713.329.1700 (fax)
713.329.1600 (switchboard)
alex.johnson@xxxxxxxxxxxxxxxx
-
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