[foxboro] Timing changes on loaded CP40
- From: <Adam.Pemberton@xxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Fri, 9 Sep 2005 07:54:19 +1000
I have recently discovered that the timer for the OSP instruction of a
LOGIC block that is configured to run at 60 seconds continuously is
running at around 72 seconds. The relevant instructions are:
CST
IN ~BO02
OSP 60
OUT BO02
which is meant to generate a low pulse for one scan very 60 seconds.
The CP is heavily loaded (~1.5 overruns/sec, 973328 total memory free)
but I would not expect it to effect times. Of course it probably also
means the PID integral gains for the CP are also being effected
(admitedly only by around 17%).
Is this normal behaviour for a heavily loaded CP40?
Regards
Adam Pemberton
Coordinator Process Control
Lihir Management Company
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