Re: [foxboro] V8.4.3
- From: "Johnson, Alex P (IOM)" <Alex.Johnson@xxxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Mon, 16 Aug 2010 10:45:13 -0500
I cheated and asked the developer. He wrote:
"I've checked the code and found that the PIDA's set point will track the
measurement in Manual so long as Setpoint Tracking is set to 1 or 2 and there
are no control errors."
That is, the setpoint tracks in MANUAL if and only if SPTTRK=1 or 2 and if
there are no errors.
Hope this helps.
Regards,
Alex Johnson
Invensys Operations Management
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Houston, TX 77041
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-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Terry Doucet
Sent: Saturday, August 14, 2010 9:13 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] V8.4.3
Tim,
My vote is with your opinion.
If nothing special is configured when the controller is in manual and the
measurement drifts away from setpoint, the setpoint will not follow. On return
to Auto, the Integral action (no PBAND action) will drive the output to bring
the meausrement back to setpoint. Obviously there are ways to configre
different action, but this is the default.
Terry
> From: Timothy.Lowell@xxxxxxxxxxx
> To: foxboro@xxxxxxxxxxxxx
> Date: Sat, 14 Aug 2010 09:33:29 -0500
> Subject: [foxboro] V8.4.3
>
> We just finished a turnaround at one of our sites that included an upgrade
> from v.8.2 and v.8.4.2 to an all v8.4.3 system.
> I'm pretty sure this is turnaround-induced amnesia from all the long hours,
> but some folks here are claiming that before the upgrade that somehow, even
> though most of the controllers are not configured with Setpoint Tracking
> turned on, the controller setpoints used to track the measurements while in
> Manual, and they aren't doing that now.
>
> I maintain that Setpoint Tracking works exactly in this version as it did in
> every version all the way back to v.A09 or whatever. I cited the v8.4.3 PIDA
> manual, which has the exact same functional diagram as the previous PIDA
> manual we had a printout of.
>
> Can I get some backup on this? Surely, Invensys would not introduce a
> substantial change in PIDA controller behavior in a maintenance release
> without telling anyone, would they?
>
> Thanks,
>
> Tim Lowell
> Tesoro Companies, Inc
> 19100 Ridgewood Parkway
> San Antonio, TX 78259
> 210-626-4929 (w)
> 210-253-0225 (c)
> timothy.lowell@xxxxxxxxxxx
>
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