Re: [foxboro] AIN Block / Deadband
- From: "Johnson, Alex (Foxboro)" <ajohnson@xxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Mon, 24 May 2004 15:02:13 -0400
The DELTxy parameter is used to specify a change delta for peer-to-peer
connections (where x=I) or to support scaling of bars on faceplates (x=I or
O).
You could us the high/low or highhigh/lowlow alarms to do what you want.
Set the alarm limit where the target cutoff is. Set the alarm deadband to
cover the fluctuations and use the alarm indicator Boolean to trigger the
desired action.
Since you don't want alarm messages from these alarms, leave the Alarm Group
as 0 or inhibit the alarm annunciation.
Make sense?
Regards,
Alex Johnson
Invensys Systems, Inc.
10707 Haddington
Houston, TX 77043
713.722.2859 (voice)
713.722.2700 (operator)
713.932.0222 (fax)
ajohnson@xxxxxxxxxxx
For the latest information on ArchestrA, go to
http://www.invensys.com/Archestra.html.
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Livingood, William
Sent: Friday, May 21, 2004 8:48 AM
To: 'foxboro@xxxxxxxxxxxxx'
Subject: [foxboro] AIN Block / Deadband
Based on the output from an AIN block, I am turning on/off equipment. The
value from the AIN block sometimes lies right near the threshold for turning
on/off the equipment. The result is that the value from the AIN block
"bounces" above and below the threshold causing the equipment to turn on and
off rapidly. Looking at the AIN block documentation, they have a deadband
category (DELT01), BUT the documentation suggests that it is not functional.
Does anyone have a simple way to send the output of the AIN block through a
deadband feature?
~Bill
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