Re: [foxboro] Alarm timer supression on PIDA block
- From: "Johnson, Alex P (IOM)" <Alex.Johnson@xxxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Fri, 6 May 2011 13:52:04 -0500
Re: you can use the new NASTDB and NASOPT parameter (time related parameters to
avoid chattering), but I am almost sure that PID\PIDA\etc... do not support
that yet
These parameters and others were added in V8.4. This is taken from B0700RT -
Table D-3 Process Alarm Enhancements Summary:
The following Block Types
PID, PIDA, PIDE,PIDX, PIDXE, DPIDA
Added support for:
* Alarm Reprioritizaiton (PRTYPE) on these alarms: HHA/LLA, HA/LA, HDA/LDA,
HOA/LOA
* Alarm Message Regeneration (AMRTIN) on these alarms: HHA/LLA, HA/LA,
HDA/LDA, HOA/LOA
* Nuisance Alarm Suppression (NASOPT, NASTDB) on these alarms: HHA/LLA,
HA/LA, HDA/LDA, HOA/LOA
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
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Corey R Clingo
Sent: Friday, May 06, 2011 10:58 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Alarm timer supression on PIDA block
"This can be a good Improvement for the I/A actually."
+1. We try to attach alarms to the "primary operator interface" blocks,
and if a controller exists, the PID(A) is almost always that block.
Corey
From:
Ricardo Abech <abech@xxxxxxxxxxxx>
To:
foxboro@xxxxxxxxxxxxx
Date:
05/06/2011 07:48 AM
Subject:
Re: [foxboro] Alarm timer supression on PIDA block
Sent by:
foxboro-bounce@xxxxxxxxxxxxx
Hi Luciano,
For most block types (AIN, CIN, etc?) you can use the new NASTDB and
NASOPT parameter (time related parameters to avoid chattering), but I am
almost sure that PID\PIDA\etc... do not support that yet, so you have to
stick with the deadband (MEASDB), not very reliable to avoid chattering if
the noise or variance is high. Unless you can use the AIN instead of the
PID to alarm (not a good idea most of the time, since the PID is normally
the block you use in the display).
This can be a good Improvement for the I/A actually. Maybe there is
something already, but I am not aware of it.
Ricardo
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