Hi,
ACCUM blocks make great timers, too. Give it a fixed .MEAS of 1.0.
Configure the MTRFAC (?? meter factor parameter) so that it is accumulating
seconds, minutes, etc. Use the alarms to give you a Boolean output you can
tie to the .INHIB of the AIN.
CALC blocks work well, too. The ACCUM gives you a better look at where you
are in the waiting period, plus it takes less room in the CP.
Tom
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of O'Toole, S.L.
(Sean)
Sent: Wednesday, September 05, 2001 3:57 PM
To: 'Foxboro DCS Mail List'
Subject: RE: Alarm Delay
Dan,
It may not be particularly elegant but you could generate a pulse based on
the state change of the CIN block which could start a 5 minute timer in
either ladder logic or a CALC block. The output would be connected to the
INHIB parameter on AIN block. I hope this gives you an idea.
Sean O'Toole
Process Engineering Group Leader
Pope & Talbot Ltd., Harmac Pulp Operations
1000 Wave Place, Nanaimo, BC Canada V9R 5M5
(250) 722-4268
> -----Original Message-----
> From: Karppi, Dan [SMTP:[EMAIL PROTECTED]]
> Sent: Tuesday, September 04, 2001 5:18 AM
> To: 'Foxboro DCS Mail List'
> Subject: Alarm Delay
>
> Dear List Members,
>
> How can I delay (disable) an AIN block analog alarm for 5 minutes after a
> state change condition in a CIN block is detected?
>
> Thanks,
> Dan
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Dan Karppi CCST
> Falconbridge Limited
> Smelter Complex
> Falconbridge, Ontario
> Canada
> P0M 1S0
>
> Phone: (705) 693-2761 ext. 3881
> Fax: (705) 699-3887
> [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
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